Under the premise of fully applying organic fertilizers, nitrogen, phosphorus, and potassium fertilizers should be applied according to soil fertility and yield goals. Pay attention to controlling the amount of nitrogen fertilizers 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 to 13 kg / mu, phosphate fertilizer (P2O5) 4 to 6 kg / mu, potassium fertilizer (K2O) 7 to 9 kg / mu, and borax 1 kg / mu; For production levels of 100 to 200 kg / mu, it is recommended to apply nitrogen fertilizer (N) 8 to 10 kg / mu, phosphate fertilizer (P2O5) 3 to 5 kg / mu, potassium fertilizer (K2O) 5 to 7 kg / mu, borax 0.75 kg / mu .
Properly increasing the number of fertilization can increase the utilization rate. In addition to basal fertilizers, overwintering fertilizers, budding fertilizers and flower fertilizers must also be applied; for direct seeding and cover sowing rape, it is necessary to increase seedling fertilizer once in winter. For transplanted rape, 60% of the total nitrogen and potassium fertilizers were used as base fertilizer, 20% as wax fertilizer (50 days after transplanting), and 20% as manure fertilizer (80 days after transplanting); for direct seeding rape, 40% of total nitrogen fertilizer was used as Base fertilizer, 30% as seedling fertilizer (25-30 days after sowing), 15% as wax fertilizer (80 days after sowing), 15% as manure fertilizer (110 days after sowing), 60% of total potassium fertilizer as base fertilizer, 30 % For wax fertilizer (80 days after sowing), 10% for manure fertilizer (110 days after sowing), and the remaining fertilizers were used as base fertilizer. In addition, pay attention to the deep application of base fertilizer. Taking rapeseed as an example, if applied only to the soil surface, it will guide the rape root system to grow longer than the soil surface without deep rooting, forming a "floating root", resulting in the instability of rape rooting, reducing the ability to absorb soil water and fertilizer, and prone to falling seedlings, Fertilization, drought and other phenomena.
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