Generally, 1000-1500 kg of compost is used per acre, and 20-25 kg of phosphate fertilizer is used. When it is mixed in the soil, it is ploughed into the topsoil. At the same time, 1500-2000 kg of pig manure water is used, and the appropriate amount of chemical nitrogen fertilizer is added to the seedbed soil. Fertilize the bed soil.
Early application
When 80% of the seedlings are in the seedlings, 750 kg of thin human and animal waste water per hectare is poured, or about 4 kg of urea is poured with water to prevent the growth of rapeseed seedlings after 3 to 4 leaves, and the leaves are red. If the base is fat enough and the seedlings grow vigorously, it is not suitable for top dressing, and the seedlings should be refined in the 4-5 leaf stage to prevent prolonged formation and high seedling formation.
Increased application of phosphorus and potassium fertilizer
Phosphorus and potassium fertilizers in the base fertilizer are not applied or the soil is deficient in phosphorus and potassium. In the seedling stage, more phosphorus and potassium fertilizer should be added. Generally, 15 to 20 kg of superphosphate is applied, or 20 to 25 kg of calcium, magnesium and phosphate fertilizers. If the phosphate fertilizer is applied to the seedbed, it is not necessary to apply phosphate fertilizer, but the 0.2% potassium dihydrogen phosphate solution can be sprayed on the foliar surface, and the potassium fertilizer should be chlorine. Potassium or potassium sulfate is applied before the seedling stage of the seedlings.
Suitable for seedling
Before and after the seedlings are planted, the acres are diluted with about 500 to 750 kilograms of thin human and animal manure water for 2 to 3 times. If the soil is dry and the seedlings are thin, it may be appropriate to apply more. In the 4 to 5 leaf stage, the main control was to stop fertilizing and watering, and to carry out seedlings to prevent the phenomenon of lengthening during the seedbed period.
Skillfully applying martilizer
Apply a small amount of nitrogen fertilizer 5 to 7 days before transplanting, and apply 7.5-10 kg of ammonium carbonate per acre to the water. If the leaf color of rapeseed seedlings is lighter, or the phenomenon of old red leaves occurs, it can be combined with spraying phosphate fertilizer. Generally, 1 to 1.5 kg of superphosphate is used. After soaking for 10 nights with 10 kg of clear water, the filtrate is properly added with water.
Application of borax fertilizer
The demand for boron in rapeseed is more and more sensitive, and the lack of boron will not only cause the flower in the late stage of rape growth, but also have a great impact on the seedling stage. Therefore, in the seedling stage, it can be combined with topdressing with 0.5 kg of borax per acre. If the seedlings have symptoms of boron deficiency, apply 50% of borax fertilizer solution with 0.1% to 0.2% concentration for foliar application. The blade is turned into normal and the effect is obvious.
(Liu Xing)
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