In the winter rapeseed production in the Yangtze River Basin, the proportion of fertilizer application is uncoordinated, the application of organic fertilizer is insufficient, the rate of returning straw is low, the lack of trace elements such as sulfur and boron, and the low planting density result in low fertilizer utilization. In this regard, the production should be scientifically fertilized to improve fertilizer efficiency.
Fertilization principle
Add organic fertilizer, promote the application of organic and inorganic fertilizers and return the straw to the field; according to the availability of effective boron in the soil, supplement the appropriate amount of boron fertilizer; appropriately reduce the application rate of nitrogen fertilizer base, increase the proportion of fertilizer; fertilizer application should be combined with other high-yield cultivation techniques In particular, attention needs to be paid to increasing planting density.
Fertilization amount
Generally, the field of 200 kg or more per mu requires 11-13 kg of pure nitrogen, 4-6 kg of phosphorus pentoxide, 7-9 kg of potassium oxide, 1 kg of boron, and a field of 100-200 kg per mu. Each acre requires 8-10 kg of pure nitrogen, 3-5 kg ​​of phosphorus pentoxide, 5-7 kg of potassium oxide, and 0.75 kg of boron. The field of 100 kg or less per mu requires 5-7 kg of pure nitrogen per mu. Phosphorus oxide 3 to 4 kg, potassium oxide 4 kg, boron 0.5 kg. In the sulfur-deficient area, sulfur can be applied 2 to 3 kg per mu. If other sulfur-containing fertilizers are applied, the amount of sulfur can be reduced as appropriate.
Fertilization method
50% of the total amount of nitrogen fertilizer is applied as base fertilizer, 20% to 30% for wintering seedling application, 20% to 30% for manure application; 60% for potash fertilizer, 40% for manure application; phosphate fertilizer, boron fertilizer and Sulfur is all used as a base fertilizer. If the organic fertilizer is applied to the base fertilizer, the amount of chemical fertilizer can be reduced as appropriate ; the amount of potassium fertilizer used in the previous season can be reduced by one-third of the potassium fertilizer.