Thirty questions that corn is most concerned about!

1. Why does the second generation seed reduce production?

Modern corn production utilizes the heterosis of the hybrid generation to yield high yield and resistance. Heterosis is a hybrid produced by two parents with different traits. The growth potential, viability, fertility, adaptability, and yield, quality and other traits exceed their parents.

The opposite of heterosis is the so-called inbreeding phenomenon. Due to the inbreeding recession, the growth potential, viability, stress resistance and yield were significantly reduced compared with the first generation of hybrids. In general, hybrid second generation yields are reduced by more than 50% over the first generation.

2. What is a genetically modified variety?

Transgenic varieties refer to new varieties of corn cultivated by transgenic technology. Genetically modified breeding is based on a pre-designed blueprint. By means of laboratory manipulation techniques, specific genes of a certain organism are transferred to another organism, and the latter is directed to obtain new genetic traits.

Before the approved use of genetically modified varieties, the national safety evaluation of genetically modified varieties is also passed. China has not yet approved genetically modified corn for agricultural production.

3. What are the benefits of deep corn cultivation in the autumn?

Deep ploughing in autumn can improve the physical and chemical properties of corn field soil, thicken the soil layer, improve soil permeability, water storage capacity and fertility, which is conducive to root growth and expand nutrient and water absorption range.

Deep ploughing also dumps pests and germs hidden in the soil to the surface to freeze or kill, and reduce pests and diseases.

4. What technologies should be mastered when corn stalks are returned to the field?

(1) Shredding in time. When the corn ear is harvested or the straw is recovered, it should be crushed in time, and the crushing length should not exceed 10 cm to avoid the soil being unreal due to the long straw.

(2) Add nitrogen fertilizer. Soil microbes need a certain amount of nitrogen when they break down crop stalks, which leads to the problem of competing crop seedlings for available nitrogen in the soil. Nitrogen fertilizer should be added in an appropriate amount to accelerate the decay of straw and make it convert effective nutrients as soon as possible.

(3) Temporary tillage. After the corn stalks are crushed and returned to the field, they should be immediately rotted or smashed, and deep ploughing is required. The ploughing depth is 20 to 25 cm. By ploughing and glanding, the problem of excessive soil porosity caused by straw returning is eliminated.

(4) Returning to the field. The water condition of the soil becomes an important factor determining the decomposition rate of straw rot, and it is necessary to irrigate in time.

(5) Prevention and control of pests and diseases. Timely prevention and control of various pests and diseases, no serious land on corn borer and smut, do not return straw to the field. The diseased straw should be burned or rehydrated after high temperature rot.

5. What is conservation tillage?

It is a new farming technique relative to traditional farming. Conservation tillage includes four technical content:

(1) Reforming the traditional farming methods of plowing ploughed soil, implementing no-till or less tillage. No-till is to not carry out any cultivation other than sowing. Less tillage includes deep pine and topsoil. Deep pine loosens deep soil and basically does not damage soil structure and ground vegetation, which can increase natural rainfall infiltration rate and increase soil water content.

(2) Covering more than 30% of the crop straws and residues, and using soil with straw to cover soil, roots and soil to protect soil, reduce wind erosion, water erosion and water ineffective evaporation, and improve natural rainfall utilization rate. .

(3) Adopting no-till sowing, realizing double operations such as ditching, sowing, fertilizing, applying medicine and covering soil repression on the surface covered with debris, simplifying the process, reducing the number of mechanical grounding and reducing the cost.

(4) Changing tillage to control weeds to control weeds by spraying herbicides or mechanical topsoil operations.

6. What is corn no-till technology?

Refers to the technique of adopting chemical weeding technology under suitable conditions, without ploughing the plough, directly opening the hole (ditch), fertilizing, sowing and planting corn on the front shovel.

7. How to overcome the problem of poor corn preparation and poor soil preparation?

Before the corn planting, it should be based on the principle of fine crushing, leveling, moisture preservation and high efficiency. The land preparation should be carried out in time to prepare for sowing seedlings.

After the corn is harvested, the direct soil preparation should be carried out under the condition that the soil water content is suitable (the water content of the 10-20 cm soil layer is 15%-20%), and it can be treated once by the large rotary tiller. If it cannot meet the required state, it can be reused. The integrated land preparation machine (slowly shallow, shallow, and flat) is operated once.

After the corn is harvested, it is not directly grounded. For example, in the spring land preparation of northern spring maize, the roots are degraded, differentiated, and precipitated over a long period of time. The water content is low, and the basis of factors such as agricultural time, weather, soil and planting plan are comprehensively considered. In the above, the grounding was carried out with a large rotary tiller at an appropriate time before the broadcast.

If the corn is planted by the wide and narrow row planting method, it is not necessary to treat the root stalk after the corn is harvested, and only the rotary cultivator can be used to shovel and level the wide row, so that the autumn land preparation is easier, the number of mechanical operations is small, and the cost is low. it is good.

The specific method is: the current ridge (65 cm) is changed into a wide (90 cm) narrow (40 cm) row planting, the corn big bell mouth period is deep and loose at 90 cm wide, and the wide row is rotary tilled after harvesting. In the next season, only corn is sown on a wide row of rotary tillage, and if soybeans are planted, they are sown in both wide rows and narrow rows.

The natural conditions and production conditions vary widely from place to place and should be flexibly controlled according to the situation.

8. Why can I increase the density?

Corn yield is composed of the number of effective panicles per unit area, the number of kernels per spike, and the 1000-grain weight.

Within a certain range, the planting density per unit area increased, the number of effective panicles increased correspondingly, and the number of kernels per spike and 1000-grain weight decreased. However, according to the characteristics of the variety and the conditions of soil fertility, the density was reasonably increased, and the number of grains per panicle and grain weight were less stable or decreased. As the number of spikes increases, the compensation effect of the significant increase in the total number of grains is large, and the yield is finally increased.

A prominent problem in current corn production is the low planting density, which seriously affects production.

The principle of reasonable close planting is that the land with high fertility can be properly densely planted, the land with low fertility should be appropriately diluted, and the fertilizer should be kept secret; the water should be properly densely planted, the water content should be dilute, and the water should be kept secret; the early maturing varieties should be properly densely planted, late ripening. The large panicle type is appropriately dilute; if the input fertilizer is sufficient, it can be properly densely planted, and the fertilizer deficiency should be dilute.

9. How to determine the spacing of corn planting due to the variety?

The row spacing planting method of corn is an important regulation way to improve the population structure and improve the utilization rate of light energy. Practice has proved that when the density is increased, proper planting methods can be deployed, and the effect of dense planting can be exerted.

The arrangement of corn row spacing varies depending on the variety and level of soil. The tolerance of the stems and leaves is small, the leaves are rushed, and the roots are developed to the depth. The distance between the plots with high fertility should be narrower; for the varieties with high stalks and flat leaves, the row spacing can be wider.

Usually, the corn planting method has the same level of flat sowing, wide and narrow rows of dense planting, ridge making and so on. The advantage of equal row broadcasting is that the plants are evenly distributed, and the light energy can be fully utilized to produce more photosynthetic materials; the wide and narrow row planting can improve the ventilation and light transmission conditions of the group, and is convenient for field management and operation; the ridge cultivation is beneficial to the early sowing of corn and the growth of seedlings. In the rainy season, the ridge is easier to drain than sitting flat; in the case of drought, it can also be used to irrigate the furrows, which is conducive to concentrated fertilization.

10. What are the key points of corn mulching cultivation technology?

(1) Grab the whole seedling. The film is planted so that there are no weeds and roots on the ground, the topsoil is fine and soft, and the row spacing is moderate; it can be broadcast earlier than the open field in time, equidistantly, and shallowly covered, and the fertilizer is staggered.

(2) Cover the film. Low-pressure polyethylene linear film with high light transmittance, good temperature increasing effect, strong tensile force, tear resistance and aging resistance should be selected. The quality of the film directly affects the emergence, protection and temperature increase. Avoid damaging the film by the wind.

(3) Apply fertilizer. The mulching film is difficult to apply fertilizer. Therefore, it is necessary to apply sufficient fertilizer and increase the application of organic fertilizer to meet the maximum demand for nutrients in the whole life of the plant.

(4) Select seeds. It is necessary to select corn varieties with appropriate growth period, leaf rushing and stress resistance.

(5) Reasonable close planting. The planting density of mulching film is generally 20% to 40% higher than that of open field planting, which should be determined according to the characteristics of the variety, soil fertility and fertilization level.

(6) Pharmacy kills grass. Controlling weeds is the key. Before the film is covered with pesticides, generally use 38% of Atrazine 0.2-0.25 kg per acre plus acetochlor EC 150-200 ml, 60 kg of water, spray evenly on the bed surface when the soil is dry. .

(7) Control pests and diseases. Seed coating is used to control underground pests, and high-efficiency and low-toxic pesticides are selected to prevent and control second-generation armyworms and corn borers.

(8) Strengthen management. For the corn field planted in the film, if the film is first sown after seeding, the seedlings should be opened in time to release the seedlings to prevent high temperature burning. Before releasing the seedlings, let the wind refine the seedlings for 2 to 3 days, then according to the enlargement, do not put the small, put the green and not put the yellow, the cloudy day, the outcrop, the principle of releasing the seedlings on the sunny day, put the seedlings and seal the seedlings with the soil.

If it is sown after mulching, it should be checked in time. When it is found that the seedlings are pressed under the membrane, it is necessary to promptly release the membrane and seal the seedlings. For corn fields grown on the membrane side, try to sown as close as possible to the mulch. It is necessary to make full use of the advantages of membrane side planting, topdressing fertilizer in the critical period of corn fertilizer requirement, and fully exerting the effect of film-muld corn yield increase.

11. How to achieve high-yield and high-efficiency water-saving irrigation of corn?

(1) Change the traditional corn irrigation method - ground irrigation.

In the late 1980s, some new irrigation methods were promoted, such as horizontal rafting (ditch) irrigation, wave surge irrigation, and long raft irrigation. The water saving effect was greatly improved.

(2) Sprinkler irrigation and drip irrigation.

The sprinkler irrigation technology has the characteristics of high water transport efficiency, strong terrain adaptability and improved field microclimate, and can be matched with agricultural technical measures such as spraying and weeding, and has good water-saving and yield-increasing effects. It is especially suitable for areas with insufficient water resources and strong water permeability.

Drip irrigation is the use of dripper or other water purifier to transport water directly to the roots of crops. The uniformity of irrigation is high, and it can be combined with fertilization and application. It is the most efficient irrigation technology.

(3) Apply other water-saving irrigation techniques.

Membrane irrigation is used in arid and semi-arid regions of northwest China. Different from the general irrigation method, the membrane is filled with water from the plastic film and infiltrated into the corn root system through the seedling hole. Due to the small resistance of the film water flow, the irrigation speed is fast and the deep leakage is small. Moreover, the mulch film can reduce the evaporation between the trees, and the water saving effect is remarkable.

In Xinjiang, Shandong, Jiangsu and other slopes without irrigation conditions can be used for dish irrigation. Dish irrigation is to use unglazed clay pots to store water. The tank is buried in the soil. The tank mouth is lower than the surface of the pot. It is usually tied with a perforated lid or plastic film to prevent evaporation of water in the tank. Water can be added to the tank or it can be collected.

12. For drought-free fields and sowing to seedlings, how to achieve drought-resistant seedlings and roots?

(1) Select drought-tolerant varieties.

Breeding and promoting drought-tolerant varieties is the main way to increase crop yield under drought conditions.

(2) Reasonable fertilization.

The application of organic fertilizer not only has full nutrients, but also has long fertilizer efficiency, and improves soil structure, coordinates water, fertilizer, gas and heat, and plays a role in regulating water and fertilizer. Therefore, it is an effective measure to improve soil water storage and preservation capacity. The fertilization method is best to apply nitrogen, phosphorus, potassium and organic fertilizers at one time, which is beneficial to the preservation of the fertilizer, and is beneficial to the infiltration of the fertilizer, and the rooting of the roots to increase the drought tolerance of the crop.

(3) Deep cultivation, fine rain and protection.

Reconstructing slope farmland with soil water storage and carrying out deep tillage of machine tillage is an important measure to protect the rain. In practice, it should adhere to early harvesting and early plowing, keep the cornice, deepen the fineness, and finely plan the land.

(4) Early sowing in time, cultivate strong seedlings.

According to the growth habits of crops, after entering the suitable sowing period, wait for the water, not equal to the fertilizer, grab the time, grab the seeding, and when encountering drought, you can use the mechanical ditch to sow, dry and wet, and realize the whole seedling. Make full use of effective accumulated temperature, light and bottom sputum to ensure early rooting of crops and form strong seedlings to improve drought tolerance.

13. How to prevent corn from stalking?

(1) Select good varieties.

If there are problems with the intrinsic factors of corn seeds, after sowing, it is impossible to control the empty stalks, which will inevitably cause losses. Therefore, we must make a good selection. At present, there are many varieties of corn hybrids suitable for planting in various places. They should be selected in good condition and purchased in the reputable seed department.

(2) Reasonable close planting.

The density of corn planting should be determined by the soil, fertilizer, and species. It should not be too thin or too dense. It is necessary to ensure that the corn plants have good ventilation and light transmission conditions, and meet the requirements of the corn cobs. It is best to use a wide and narrow row of planting methods.

(3) Strengthen the management of corn during the growth period.

Such as time seedlings, fixed seedlings, choose to stay strong seedlings; do a good job of weeding and weeding; conscientiously prevent pests and diseases; increase fertilizers, especially those with low soil fertility, should apply heavy base fertilizer, topdressing should be light and heavy, nitrogen, phosphorus, Potassium should be applied appropriately, and micro-fertilizer should be applied. 0.5 to 1 kg of zinc sulfate per acre; reasonable irrigation, watering during seedling control, and timely irrigation after jointing.

(4) Implement manual assisted pollination.

Before flowering, you can go to the males in an interlaced manner. If the stalks are too long, you can cut the top 3 to 7 cm to make the filaments come out early and increase the chance of pollination.

(5) Topdressing the young panicle differentiation fertilizer and the earing fertilizer.

The time is 5 to 7 days before the plant grows and develops into the ear and the ear, to raise the ear.

14. How to prevent corn from being abruptly missing?

The abundance of corn abundance is closely related to varieties, soil, fertilizer, climate, cultivation management, pests and diseases.

The main countermeasures to prevent baldness and granules are:

(1) Planting excellent varieties. Planting varieties that are resistant to disease, insects and adaptability.

(2) Improve soil and enhance soil water retention and fertilizer retention capacity. It is recommended to use compost and deep tillage and intermediate tillage techniques to improve the soil structure, promote the growth and growth of corn, and enhance the resistance of corn to adverse environments.

(3) Rational fertilization of water. It is necessary to increase the application of organic fertilizer, combined with the application of nitrogen, phosphorus and potassium to prevent the lack of phosphate fertilizer and boron fertilizer in the field; to prevent drought and flood disasters, the water supply after corn jointing should be timely and appropriate to promote the development of male and female ears.

(4) Strengthen cultivation management. 1 According to the variety, soil strength and planting method, determine the density according to local conditions, to create a good ventilation and light transmission conditions, to meet the light requirements of the middle and upper leaves, and promote the development of the ear. 2 Strengthen cultivating and weeding and cultivating soil. 3 Use wide and narrow ridge planting technology to improve the ventilation and light transmission conditions in the field. 4 When encountering bad climatic conditions and affecting normal pollination, artificial assisted pollination techniques should be used.

(5) Strengthen pest and disease prevention and control.

15, how to prevent corn from lodging?

(1) Select the dwarf bar anti-falling variety.

(2) Appropriately deepen the plough layer, promote root development, increase the number of roots and depth of soil.

(3) Seedling transplanting. After the slow seedling period, the stems are stronger and stronger.

(4) Fertilizer seedlings. The water and fertilizer are higher in the field, and the water and fertilizer seedlings are controlled before the festival, and the roots are stalked and the stems are strong.

(5) Reasonable close planting. Usually, there are 4,500 acres of compact seedlings and 3,500 flat varieties.

(6) Implementing nitrogen, phosphorus and potassium formula fertilization.

(7) Chemical regulation. Spray anti-dumping regulators such as Jindele or Kangfengli according to the instructions.

(8) Control corn borer, stem rot, etc.

16. Why should corn be chemically regulated?

Generally, when the density of corn varieties exceeds 4,500 plants/mu, lodging tends to occur. Applying chemical control technology, spraying corn micro-regulators such as Jindile or Zhuangfengling on the foliar surface of the corn joint can reduce the vegetative body of the corn, the stalks of the stalks, and the lodging resistance, without changing the corn. The purpose of panicle traits and the construction of high-yield populations.

17. What are the key links in increasing corn production?

In order to obtain high yields, corn should pay attention to and grasp the following two links:

The first is to prevent the problem of burning buds at the seedling stage. It is not possible to use high-nitrogen compound fertilizer for the bottom fertilizer. It is necessary to use urea with caution to prevent burnt buds and roots.

The second is to prevent post-fertilization problems. It is best not to engage in fertilization once for corn, which is called "one shelling." Topdressing is the best way to solve the problem of de-fertilization. If you use slow-release urea, you can apply a slow-release urea in the big bell period; if it is quick-acting urea, you should apply it again.

18. The more fertilization the higher the yield is?

Within a certain range, corn yield increases with the increase of fertilization amount; when the fertilization amount reaches a certain level, continuing to increase the amount of fertilization can not only increase production, but even cause yield decline. So the more fertilized, the higher the corn yield.

Excessive fertilization, especially excessive application of nitrogen fertilizer, often leads to the following problems: 1 the crop resistance is reduced, and pests and lodgings are prone to occur; 2 the yield is not increased, the economic benefit of fertilization is decreased; 3 the nutrient is lost, Environmental problems such as atmospheric and water pollution.

19. How to fertilize corn to achieve scientific and reasonable, increase production and income?

(1) According to the corn production level, consider the soil fertility capacity to determine the reasonable total fertilization.

(2) The amount of fertilizer required for different growth stages of maize is different, and the seedling stage is the critical period of nutrient. Although the demand is not high, it is very sensitive, and it is difficult to make up in the middle and late stages of the lack of fertilizer; the maximum efficiency period is from the allocation to the flowering stage, and the crop grows rapidly. , need a large amount of fertilizer.

(3) In order to reduce losses, fertilizers should be applied in depth. Phosphate fertilizer has poor mobility. In order to improve the utilization rate of phosphate fertilizer, phosphate fertilizer should be applied intensively.

(4) Select a suitable single fertilizer or a reasonable compound (mixed) fertilizer, pay attention to supplement zinc and other trace element fertilizers.

(5) Combine fertilization technology with high-yield corn cultivation techniques and irrigation techniques.

20. Why does the one-time fertilization of corn not solve the problem of not losing fertilizer during the whole growth period?

The growth period of spring maize is more than 120 days. When the seedling temperature is low, the growth is slow, mainly rooted and long leaves. The nutrient content is small, and the peak of fertilizer needs to be late.

From the dialing to the heading stage, the nutrient growth and reproductive growth stages are required. The most nutrient content is needed. About 50% of the nitrogen is absorbed at this stage. If the nutrient supply is not available, the ear size will be affected.

In the northeast region, one-time fertilization refers to the one-time application of the fertilizer required for the whole growth period of spring maize as a base fertilizer in the spring when ridges are applied, and no longer topdressing in the later stage.

The fertilizer applied was mainly fast-acting high-nitrogen compound fertilizer, and the release rate of nutrients was not synchronized with the fertilizer requirement of corn, which caused the supply of nutrients in the late growth stage of corn, and the yellow feet and de-fertilization of corn stalk occurred.

21. Why is nitrogen fertilizer used as a top dressing?

The most common nitrogen fertilizers currently are ammonium bicarbonate and urea.

When these fertilizers are applied to the soil, the ammonium ions produced are easily volatilized in the form of ammonia (NH3), which causes nitrogen loss on the one hand. On the other hand, if the ammonia concentration is high, the mesophyll necrosis occurs in the corn, and brown spots appear between the veins. Ammonia poisoning affects production.

Therefore, the nitrogen fertilizer should be applied as deep as possible, and the depth should be close to 10 cm.

22. What is the cause of the red seedling phenomenon in corn?

The main cause of red seedling in corn is phosphorus deficiency. On the one hand, the soil has low available phosphorus content and insufficient phosphorus supply; on the other hand, it encounters low temperature in corn seedling stage, poor root development, and reduces the ability to absorb phosphorus, while low temperature leads to a decrease in soil phosphorus availability. Therefore, even if the soil contains a high amount of phosphorus, corn red seedling phenomenon will occur.

Effective measures to prevent corn red seedlings: Phosphate fertilizers are used as seed fertilizers, and the amount of phosphate fertilizer per acre is 1 to 2 kg (P2O5) (diammonium phosphate 2 to 4 kg).

If red seedlings have appeared in the field, the following measures can be taken: (1) spraying 300 times of potassium dihydrogen phosphate on the foliar surface 2 to 3 times, spraying once every 3 days; or spraying 1% superphosphate Solution (clear liquid); (2) loose soil to increase ground temperature.

23. How to apply zinc fertilizer to the symptoms of zinc deficiency in corn?

Symptoms of zinc deficiency in maize are chlorosis, clusters, lobules, shortened internodes, short plants, and growth inhibition.

The corn seedlings are deficient in zinc, and the middle and lower parts of the new leaves form white seedlings, also known as white seedlings; zinc is deficient after the jointing, yellow and white streaks appear in the lower part of the leaves, which are translucent, like white silk or plastic film, wind Blowing is easy to tear, called mosaic disease or white strip dryness. At the same time, the plants are dwarfed, the ears are small, and the grains are abrupt.

The main basis for determining whether zinc is deficient in zinc is that the soil available zinc (DTPA-Zn) content is less than 0.5 mg/kg (zinc deficiency threshold).

When the effective zinc content of the soil is lower than the critical value, the zinc sulfate may be applied by the base fertilizer by 1 to 2 kg/mu, or the foliar spray concentration may be 0.1% to 0.2% of the zinc sulfate solution of 30 to 60 kg/mu. It can be sprayed at the seedling stage, the dialing stage, the big bell stage, and the heading stage, but the spraying effect is better in the seedling stage and the jointing stage.

24, how to better use slow release fertilizer?

The principle of using controlled release fertilizer is that the nutrient release of fertilizer should be synchronized with the nutrient demand of crops.

The release period is too long, the nitrogen supply in the early stage of corn is insufficient, the seedling is poor, affecting the later growth and yield formation; the release period is too short, and the release of nitrogen in the early stage of the growth period is large, and it is prone to burn phenomenon and increase the loss of nitrogen fertilizer. Insufficient supply of nitrogen in the middle and late stages will eventually affect production.

Slow-release fertilizers Compound fertilizers containing slow-release fertilizers are generally applied as base fertilizers. The price of slow-release fertilizers or compound fertilizers containing slow-release fertilizers is higher than that of common fertilizers, so the economic benefits of fertilization should be considered when using these fertilizers.

25. What problems should be paid attention to when applying high-nitrogen compound fertilizer in corn?

There are various types of high-nitrogen compound fertilizers on the market, and their common feature is high nitrogen content, which is suitable for single-use application or as a top dressing for corn.

However, the problem to be noted is that the high-nitrogen compound fertilizer is generally an ammonium-based or urea-based compound fertilizer, and it is easy to form biuret in the production process. If too much fertilization is applied, it is easy to cause burning, so high-nitrogen compound fertilizer is applied. To avoid burning phenomenon.

The high-nitrogen compound fertilizer should be separated from the seed by 3 to 5 cm when applied as the base fertilizer; it is best to apply the top dressing during the seedling stage or the jointing stage.

If conditions permit, it is recommended to apply high-quality organic fertilizers at the roots every time, such as root application or Kangbaochong fertilization, to activate the soil (especially the plots where symptoms of compaction have occurred), and promote the development of roots in depth. For the leaves to transport better quality nutrients, prosperous growth, high yield and stable production is very significant.

26, interlaced to the male

When the corn has just been plucked, one line or one plant will go to one tassel, and the whole field will be one-half of the tassel, which is conducive to ventilation and light transmission in the field, saving nutrients and reducing pests, which can increase yield by 5% to 8%.

The method of emasculation is: when the tassels are pulled out from the parietal lobe by 1/3 or 1/2, the tassels are removed in time by interlacing or septum before loosening. It is best to remove the male plants of the first or the male plants or the weak plants, but do not go to the males in the rows, so as not to affect the pollination. When the males are removed, the top leaves should not be damaged, and the stems and leaves above the ears should not be cut off. Reduce production.

Not all of the corn is suitable for emasculation. It is mainly used in high-yield fields, planting corn fields with excessive density, and the plants grow in a balanced manner. The tassels are tidy and uniform, and the effect of increasing the yield after emasculation is obvious. Do not go to the male when the corn is squirming in the rainy or hot and dry weather.

27. Artificial assisted pollination

In the corn flowering period, if there is a strong wind, for more than 2 days in a cloudy day, when the rain is high and the temperature is high, artificial assisted pollination can be carried out. Pollination should be carried out on a sunny morning in the morning (9-11 hours), and pollination should be carried out while collecting powder.

After removing the fresh pollen from the husk, use a brush to pick up a little of the filaments that are given to the ears. You can also put the pollen in a small container and seal the mouth with 2-3 layers of gauze or stockings. Gently tap to make the pollen evenly fall on the filament.

28, standing stalks suede drying

After the corn is fixed (ie, during the ripening period or the end of the milk), the leaves of the corn cobs are all opened, but the leaves are not removed.

Let the grain on the corn cob continue to grow on the one hand, directly exposed to the sun on the one hand, receive more sunlight and heat, accelerate the transportation of rich nutrients in the stem to the grain, and enhance the ability of the grain to absorb nutrients. Guarantee autumn harvest.

29. What is the cultivation technique of large ridges?

The large ridge double-row mulching cultivation technology is an advanced cultivation technique that enables the crops to fully exert the marginal effect and significantly improve the utilization of light energy and water and fertilizer through the reform of the farming system. It has the functions of fertilizing soil fertility, protecting moisture, protecting fertilizer, and heat preservation, and has obvious characteristics of increasing production and increasing income.

One is to make a wide ridge with a width of 120-130 cm at the bottom of the ridge and a width of 90 cm at the top of the ridge. The past two ridges (ranging from 60 cm to 65 cm) are combined into a large ridge, and two rows of corn are planted on the ridge. The line spacing is 40 cm and the large line spacing is 80 cm or 90 cm.

The other type is a wide ridge with a ridge width of 90-98 cm and a ridge width of 60-70 cm. The three small ridges of the original 60-65 cm are combined into two wide ridges, and two rows of corn are planted on each ridge. That is, from the past three lines to four lines, the small line spacing is 30 cm, the large line spacing is 60 cm or 67.5 cm, and the ridge is timely suppressed after the ridge.

Generally, the first method is more used.

30. What is the wide and narrow row planting technology?

Different from the traditional farming methods, the corn is wide and narrow, and the ridge is cultivated as a flat, the uniform ridge is wide and narrow, the shallow plough is deep, the low sorghum is high, and the rest is changed every other year.

(1) Change the ridge as a flat work.

(2) Change the uniform planting into wide and narrow rows, with a wide behavior of 80cm and a narrow behavior of 40cm.

(3) Change the three shovel and three shovel to a deep pine; in mid-June, it is deep and loose on the wide line, and the depth is above 30cm.

(4) Semi-fine seeding for fine seeding.

(5) Change the shallow application of chemical fertilizer to deep application.

(6) Change the roots and smash the smashing field into natural rot and return to the field.

(7) Change the low stay to high stay, and the height of the stubble is 30-40cm.

(8) Change the overall operation interval, the working area is 50% of the cultivated area.