Rapeseed is one of the main oil crops in our province. What should we pay attention to when fertilizing fertilization? Experts from the Provincial Soil and Fertilizer Station believe that the amount of fertilizer is different depending on the target yield of rapeseed. In the area with a target output of 200 kg/mu or more, the total amount of fertilization per acre (purified) is: 12-14 kg of nitrogen fertilizer, 4-6 kg of phosphate fertilizer, 7-9 kg of potash fertilizer, 1 kg/mu of borax; target yield 100-200 In the area of ​​kg/mu, the total amount of fertilization per acre (purified) is: 10-12 kg of nitrogen fertilizer, 3-5 kg ​​of phosphate fertilizer, 5-7 kg of potash fertilizer, 0.75-1 kg of borax, and the target yield of 100 kg/mu or less. The total amount of fertilization per acre (purified) is: 7-9 kg of nitrogen fertilizer, 3-4 kg of phosphate fertilizer, 0-4 kg of potassium fertilizer, and 0.5-0.75 kg of borax.
When fertilizing, you must master four technical points:
Apply enough base fertilizer. The base fertilizer is mainly organic fertilizer and supplemented by chemical fertilizer. Generally, 1000-1500 kg of farmyard manure per acre, special formula fertilizer for rapeseed or 25-30 kg of general-purpose compound fertilizer plus 0.5-1 kg of boron fertilizer. When applying, combine the ploughing and land preparation, and plow the farmyard manure, compound fertilizer (or formula fertilizer) and boron fertilizer into the 20-30 cm tillage layer, remembering that the fertilization is too shallow, so as not to cause deferment in the middle and late rapeseed.
Apply seedling fertilizer early. The application amount is 5-6 kg per mu of urea. If the base fertilizer is not applied with phosphorus or potassium fertilizer, 8-10 kg of high-nitrogen ternary compound fertilizer or rapeseed special formula fertilizer can be applied per mu. During the application period, it is generally applied at the time of seedling or 5 pieces of true leaves. The spring-yellow varieties should be applied early when the winter is warmer, and the winter temperature is low, which can be applied late. Apply a general application. In late November, it is possible to apply the wax fertilizer in combination with the roots of the roots, and apply 50-100 kilograms of grass ash or crushed straw per acre to protect the water, protect the temperature, and prevent freezing.
Stabilize fertilization. The base and seedlings are sufficient, the plant grows robustly, and the fertilizer can be applied less or not; the base fertilizer and the seedling fertilizer are insufficient, and the tendency of de-fertilization should be applied early, generally applying high-nitrogen compound fertilizer or rapeseed special formula fertilizer per acre 15 - 20 kg. The application period is generally applied in the middle of the twitching and the height is 15-30 cm. If the growth is strong, it can be applied in the late stage of convulsion and 30-50 cm in height to prevent the flowering period from becoming too long and causing the stagnation. The method of application is preferably applied in a strip and cannot be applied in the morning when the dew is not dry.
Skillful application of flower fertilizer. For the strong growth, the amount of fertilization in the flood season may not be applied or applied less; for early maturing varieties, or in the initial flowering period. The application method and quantity, rapeseed flower topdressing can be foliar spray, spraying 0.1%-0.2% urea or 0.2% potassium dihydrogen phosphate solution 50 kg per mu during flowering and pod-forming period. In addition, spraying 0.2% borax aqueous solution in the late stage of seedling and twitching period can prevent the phenomenon of “flowers and not real†and increase the yield.
This article URL: 2016/2017 how to fertilize rapeseed planting high-yield rapeseed fertilization technology points
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