The difference between chlorine-based compound fertilizer and sulfur-based compound fertilizer

Chlorine-based compound fertilizer refers to a chlorine-containing compound fertilizer prepared by processing potassium chloride and ammonium chloride as a potassium source. The sulfur-based compound fertilizer is a compound fertilizer prepared by using potassium sulfate as a potassium source or potassium chloride to remove chloride ions. The specific differences between chlorine-based compound fertilizer and sulfur-based compound fertilizer are as follows:
1. Different composition: The sulfur-based compound fertilizer has low chlorine content, the national standard is less than 3%, and contains a large amount of sulfur, which can effectively improve the symptoms of soil sulfur deficiency; while the chlorine-based compound fertilizer contains a lot of chlorine, which is bad for some crops. influences.
2, the process is different: the sulfur-based compound fertilizer has a very low chloride ion content, and the chloride ion is removed during the production process; while the chlorine-based compound fertilizer does not remove the chlorine element harmful to the chlorine-free crop during the production process, so the product contains a large amount of chlorine.
3, the scope of application is different: chlorine-based compound fertilizer has adverse effects on the yield and quality of the avoidance of chlorine crops, seriously reducing the economic benefits of such economic crops; and sulfur-based compound fertilizer is suitable for all kinds of soils and various crops, and can Effectively improve the appearance and quality of various economic crops, can significantly improve the grade of agricultural products.
4. Different application methods: Chlorine-based compound fertilizer can be used as base fertilizer and top dressing. It is not suitable for seed fertilizer. When used as base fertilizer, it should be mixed with organic fertilizer and phosphate rock powder in neutral and acidic soil. It should be applied early for topdressing. The sulfur-based compound fertilizer can be used as base fertilizer, top dressing, seed fertilizer and top dressing.
So which kind of fertilizer application effect is good? Nowadays, many farmers’ friends are affected by advertising and they all think that the sulfur base is good. This is not true.
For cash crops, especially for vegetables that require more sulfur, such as onions, leeks, garlic, etc., or sulfur-based compound fertilizers that are more sensitive to sulfur deficiency, sugar cane, peanuts, soybeans and kidney beans, but in aquatic vegetables. It is better to use chlorine-based compound fertilizer on hemp crops because chloride ions are necessary for hemp crops, which promote fiber development and enhance fiber toughness.
For field crops, such as corn, rice, soybeans, wheat and other crops, the fertilizer efficiency of the two types of compound fertilizers is the same, no difference. The compound fertilizer with potassium sulphate as raw material is very expensive, because the price of potassium sulphate is too high, so it is not necessary to use sulphur-based compound fertilizer on field crops, and it is not cost-effective.
For the use of chlorine-based compound fertilizers, according to the sensitivity of crops to chloride ions, they are specifically divided into hi-chlorine crops: coconut, onion, spinach, celery, cabbage, etc.; crops with strong chlorine tolerance: sugar beet, rice, millet, sorghum, Barley, wheat, corn, eggplant, peas, chrysanthemums, etc.; chlorine-tolerant crops are: cotton, soybeans, rapeseed, tomatoes, citrus, grapes, tea, onions, radishes, etc.; avoid chlorine crops: lettuce, green beans, tobacco , yam and so on. Trinitrogen effect is very different
Ammonium nitrogen is easily adsorbed in an anionic soil colloid, while nitrate nitrogen cannot be adsorbed and has greater mobility.
After the nitrate nitrogen is absorbed by the plant, it can be further synthesized by the reduction of nitrate reductase and nitrite reductase into ammonium nitrogen.
Urea nitrogen is a common nitrogen source for the production of dry compounded granular compound fertilizer. After being applied to the soil, it is generally hydrolyzed by urease and converted into ammonium nitrogen fertilizer, which can be absorbed and utilized by plants.
The effect of applying ammonium nitrogen to rice is better than that of nitrate nitrogen. Because of the lack of nitrate reductase in the roots of rice seedlings, nitrate nitrogen cannot be used very well. In addition to the rice itself, the application of nitrate nitrogen in paddy fields is prone to loss, and denitrification under flooding conditions is also the cause of nitrogen loss. Therefore, in the application of nitrate nitrogen fertilizer in rice fields, it is believed that the fertilizer efficiency is only 60%-70% of ammonium nitrogen fertilizer. Tobacco and vegetables are crops that look like nitrate. The nitrate nitrogen fertilizer is very soluble and has high activity in the soil. It can quickly provide crop nitrogen nutrition, and at the same time, it is easy to lose and has short fertilizer efficiency. This property meets the requirements of tobacco, and the leaves need to grow fast and fall to maturity when appropriate. Moreover, nitrate nitrogen is beneficial to the formation of organic acids such as citric acid and malic acid in tobacco, and the roasted tobacco leaves have good quality and good combustion property.
The yield of nitrate nitrogen in vegetables is high. For example, nitrate nitrogen is lower than 50% of total nitrogen in fertilizers , and the yield is significantly reduced. Therefore, when producing tobacco and vegetable special fertilizers, there must be a certain proportion of nitrate nitrogen in the nitrogen fertilizer. However, when the soil moisture, temperature and aeration conditions are suitable, the ammonium nitrogen can be oxidized to nitrate nitrogen by nitrification. Therefore, tobacco and vegetables are not absolutely impossible to apply fertilizer containing ammonium nitrogen . In addition, the application of physiological acid fertilizers such as ammonium sulfate to grow poorly is often not due to the unsuitable ammonium nitrogen fertilizer, but due to physiological acidity.