In the winter oilseed rape production in the Yangtze River Valley, the fertilizer application rate is inconsistent, the organic fertilizer application is insufficient, the straw returning rate is low, the trace elements such as sulfur and boron are lacking, and the low planting density leads to problems such as low fertilizer utilization rate. In this regard, scientific fertilization should be used in production to improve fertilizer efficiency.
Principles of fertilization apply organic manure, promote organic and inorganic fertilizer application and straw return; apply appropriate amount of boron fertilizer according to the available boron supply status of the soil; appropriately reduce nitrogen fertilizer application rate and increase the proportion of manure; fertilizer application should be combined with other high yield and quality The combination of cultivation techniques requires special attention to increase planting density.
Fertilizers usually produce more than 200 kilograms of land per mu, and 11 to 13 kilograms of pure nitrogen, 4 to 6 kilograms of phosphorus pentoxide, 7 to 9 kilograms of potassium oxide, 1 kilogram of boron, and 100 to 200 kilograms per mu are needed per acre. Each acre requires 8 to 10 kilograms of pure nitrogen, 3 to 5 kilograms of phosphorus pentoxide, 5 to 7 kilograms of potassium oxide, 0.75 kilograms of boron, and a plot of land less than 100 kilograms per kilogram of pure nitrogen. , phosphorus pentoxide 3 ~ 4 kg, potassium oxide 4 kg, boron 0.5 kg. Sulfur-deficient areas can use 2 to 3 kg of sulfur per mu. If other sulfur-containing fertilizers are used, the amount of sulfur can be reduced as appropriate.
Fertilization method 50% of total nitrogen fertilizer is applied as base fertilizer, 20% to 30% for wintering seedling fertilizer application, 20% to 30% for manure application, 60% potassium fertilizer is used as base fertilizer, and 40% is for manure application; Phosphate fertilizer, boron Fertilizer and sulfur are all used as basal fertilizers. If the basal fertilizer is applied with organic fertilizer, the amount of chemical fertilizer can be reduced as appropriate; in the case of returning crop straw to the field in the previous season, one-third of the amount of potash fertilizer can be reduced.
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