Under the premise of full application of organic fertilizer, nitrogen, phosphorus and potassium fertilizers should be applied according to soil fertility and yield targets, and attention should be paid to controlling the amount of nitrogen fertilizer and increasing the application of phosphorus and potassium fertilizers. For output levels above 200 kg/mu, it is recommended to apply nitrogen fertilizer (N) 11~13 kg/mu, phosphate fertilizer (P2O5) 4~6 kg/mu, potash fertilizer (K2O) 7~9 kg/mu, borax 1 kg/mu; For the production level of 100-200 kg/mu, it is recommended to apply nitrogen (N) 8 to 10 kg/mu, phosphate (P2O5) 3 to 5 kg/mu, potassium (K2O) 5 to 7 kg/mu, and borax 0.75 kg/mu. .
Appropriate increase in the number of fertilization can increase utilization. In addition to basal fertilisers, winter fertilizer, bud fertilizer and flower fertilizer are also applied. For direct seeding and interplanting rapeseed, it is necessary to increase the seedling fertilizer in winter. For transplanting rapeseed, the total amount of nitrogen and potassium fertilizer is 60% for basal fertilizer, 20% for wax fertilizer (50 days after transplanting), and 20% for manure fertilizer (80 days after transplanting); for direct seed oil rape, 40% of total nitrogen fertilizer is used as Base fertilizer, 30% for drawing fertilizer (25~30 days after sowing), 15% for wax fertilizer (80 days after sowing), 15% for alfalfa fertilizer (110 days after sowing), 60% of total potassium fertilizer for basal fertilizer, 30 % for wax fertilizer (80 days after sowing), 10% for alfalfa fertilizer (110 days after sowing), and the rest of the fertilizer was used as base fertilizer. In addition, pay attention to deep application of basal fat. In the case of live rapeseed, for example, if applied only to the soil surface, it will lead the root system of rapeseed to grow longer than the soil surface without deep-rooting, resulting in “floating rootsâ€, resulting in unstable rooting of rapeseeds, decreased ability to absorb soil water and fertilizers, and prone to falling seedlings. Defertilization, drought and other phenomena.
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