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In view of the uncoordinated proportion of nutrient application in winter rapeseed production in the Yangtze River Basin, the application of organic fertilizer is insufficient, the rate of returning straw is low, the lack of medium and trace elements such as sulfur and boron occur, and the low planting density of rapeseed leads to low fertilizer utilization. The following fertilization principles:
(1) Adding organic fertilizer, promoting organic-inorganic cooperation and straw returning;
(2) According to the availability of available boron in the soil, an appropriate amount of boron fertilizer is added;
(3) Appropriately reduce the application amount of nitrogen fertilizer base, do a good job of manure application, and increase the proportion of manure;
(4) Fertilizer application should be combined with other high-yield and high-quality cultivation techniques, especially attention should be paid to increasing planting density.
2. Fertilization amount and method
(1) The production level is above 200 kg/mu: nitrogen fertilizer (N) 11-13 kg/mu, phosphate fertilizer (P2O5) 4-6 kg/mu, potash fertilizer (K2O) 7-9 kg/mu, borax 1.0 kg/mu.
(2) The production level is 100-200 kg/mu: nitrogen fertilizer (N) 8-10 kg/mu, phosphate fertilizer (P2O5) 3-5 kg/mu, potash fertilizer (K2O) 5-7 kg/mu, borax 0.75 kg/mu .
(3) The production level is below 100 kg/mu: nitrogen fertilizer (N) 5-7 kg/mu, phosphate fertilizer (P2O5) 3~4 kg/mu, potash fertilizer (K2O) 0-4 kg/mu, borax 0.5 kg/mu.
In the sulfur-deficient area, the sulfur can be applied in the range of 2 to 3 kg/mu. If other sulfur-containing fertilizers are used, the amount of sulfur can be reduced. If the organic fertilizer is applied to the base fertilizer, the amount of chemical fertilizer can be reduced as appropriate; the straw can be reduced when the straw is returned to the field in the previous season. 1/3 potassium fertilizer dosage.
50% of the total amount of nitrogen fertilizer is applied as base fertilizer, 20% to 30% for wintering seedling fertilizer, 20% to 30% for manure fertilizer, and the manure fertilizer should be appropriately advanced in the three-crop area; 60% of potassium fertilizer is used as base fertilizer, 40% Used as manure; phosphate fertilizer, boron fertilizer and sulfur as base fertilizer.
Expert Group on Soil Testing and Formula Fertilization Technology of the Ministry of Agriculture
Winter rapeseed scientific fertilization guidance
1. Fertilization problems and fertilization principles
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