The first top dressing was carried out about 50 days after transplanting, that is, before the wintering period of rapeseed, the topdressing application of urea was 4~6 kg/mu and potassium chloride was 4~5 kg/mu. The method of fertilization is to apply the soil in combination with the cultivator. If the cultivator is not used for cultivating, a small ditch with a depth of 10 cm can be opened between the rows. Mix the two fertilizers and apply them. After fertilization, cover the soil. The second top-dressing is applied during the period of moss-raising after spring, urea 4~6 kg for Mushi and 4~5 kg for potassium chloride. At this point the rape has been sealed, can only be applied on the surface, be sure to spread evenly, it is best to choose to sprinkle before the rain.
After the flowering period, foliar fertilizer should be sprayed in time to promote the photosynthesis of functional leaves. Can be combined with drug, spray once a week, 0.2% of potassium dihydrogen phosphate and 1% ~ 2% urea solution, a total of 2 times, the base fertilizer is not applied to the field of boron fertilizer and zinc fertilizer, should be combined with foliar fertilizer, with 0.2 % Borax was sprayed with 0.2% zinc sulfate solution.
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