The problems with fertilization in rapeseeds include: generally low levels of nitrogen, phosphorus, and potassium fertilizers, inconsistent nutrient ratios, insufficient application of organic fertilizers, low return of straw, and lack of trace elements such as boron.
The principle of fertilization is to increase the organic fertilizer, promote the return of straw and organic fertilizer.
Suggestions for fertilizer application are based on available boron in the soil and supplement with boron fertilizer: rape is one of the crops requiring more boron. High-quality cabbage hybrid rapeseed species with high yield potential are currently particularly sensitive to boron. When the available boron content in the soil is lower than 0.6 mg per kilogram, 0.5 to 1 kg of borax per acre is applied. To ensure the normal growth of rapeseed and to prevent boron from being enriched in the soil, the boron concentration in the soil is increased when the available boron content in the soil is greater than When 0.6 milligrams per kilogram is applied, borax is generally not applied except for a small amount of borax in the base of high-yield areas. If the plant shows symptoms of boron deficiency, spray borax at a concentration of 0.2% during the flood season and early flowering period. Appropriately reduce the amount of nitrogen-based fertilizer application and increase the proportion of manure: From the results of nutrient content analysis of soil samples, the supply of soil nitrogen is sufficient, and the amount of nitrogen-based fertilizer application should be appropriately reduced, and the proportion of manure fertilizer should be increased. During the bud stage, rape enters a vigorous period of vegetative growth and reproductive growth. It is a critical period for fertilization, especially for potassium-deficient soils, sandy soils, and hybrid paddy fields. Potassium fertilizers in spring can receive significant yield increase. The dressing can be carried out from late February to early March. Generally, 5 to 7.5 kg of urea or 10 to 15 kg of ammonium bicarbonate per mu and 150 to 200 kg of vegetation ash can be applied. Water irrigation for weeding and weeding.