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The main problems of winter rape in the Yangtze River Basin: the use of nitrogen, phosphorus and potassium in the rapeseed production in the Yangtze River Basin is generally low, the proportion of nutrients is not coordinated, the application of organic fertilizer is insufficient, the rate of returning straw is low, and the lack of trace elements such as boron occurs.
Principle of topdressing fertilizer (1) According to the soil effective boron condition, supplement the boron fertilizer, pay attention to the use of qualified boron fertilizer. (2) Add fertilizer to the plot where the amount of nitrogen applied to the base is insufficient. (3) Pay attention to clearing the ditch to prevent spring stains.
Fertilization amount and ratio Yield 100~150 kg/mu: timely application of manure, nitrogen fertilizer (N) 2.5 kg/mu, potash fertilizer (K ​​2O) 2 kg/mu. The base fertilizer has no field for applying boron fertilizer. In the early stage of convulsion to flowering, the surface of the leaf is sprayed with borax 0.2 kg/mu.
The production level is 150~200 kg/mu: timely application of manure, nitrogen fertilizer (N) 3.0 kg/mu, potassium fertilizer (K ​​2 O) 2.5 kg/mu. The base fertilizer has no field for applying boron fertilizer. In the early stage of convulsion to flowering, the lob sand is sprayed with 0.3 kg/mu.
The production level is above 200 kg/mu: timely application of manure, nitrogen fertilizer (N) 3.5 kg/mu, potash fertilizer (K ​​2 O) 3 kg/mu. The base fertilizer has no field for applying boron fertilizer. In the early stage of convulsion to flowering, the lob sand is sprayed with 0.3 kg/mu.
If the base fertilizer is applied with organic fertilizer, the amount of chemical fertilizer can be reduced as appropriate. In the sulfur-deficient areas, calcium phosphate, potassium sulfate, and sulfur-based compound fertilizers should be preferred in the application of the base fertilizer, or in the first topdressing, the ammonium fertilizer should be selected from the topdressing fertilizer, and about 2 kg of elemental sulfur should be applied per mu. In view of the long-term low-temperature and low-light climate in the main producing areas from the winter of 2011 to the spring of 2012, the situation of rapeseed seedlings is weak, and it is necessary to apply fertilizers in time according to the actual situation of each place. Pay attention to combined with irrigation or after rain to improve fertilizer utilization.
Scientific fertilization of winter rapeseed in the Yangtze River Basin
Recently, the expert group of soil testing and fertilization technology of the Ministry of Agriculture gave suggestions on the scientific fertilization of winter rapeseed in the Yangtze River Basin.
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