In the return period, fertilization should be combined with watering. As the temperature rises, winter rape gradually recovers from its dormant state, and the roots begin to move and new leaves grow. When more than 50% of all plants in the field grow 0.5 to 1 centimeter, the leaves enter the returning green stage.
Winter rapeseed is a fertilizer crop. It grows rapidly in the returning green period and has a high requirement for water and fertilizer. It should be poured back to Qingshui in a timely manner in places where irrigation conditions exist, and a suitable amount of urea (3 kg/mu) or ammonium bicarbonate (5 kg/mu) can be used in conjunction with watering. ~10 kg/mu). At the same time, in order to prevent the occurrence of pests and diseases, we must promptly clear the dead branches and leaves, combined with weeding for shallow hoe. For moderately dense fields, we must have appropriate seedlings, spacing of 10-15 cm, strong seedlings should be thin, weak seedlings should be dense.
During the bud period, it is necessary to top up fertilizer. The winter rapeseed enters the bud stage soon after returning green. The growth of the planting height is 2 to 3 centimeters per day. It is an important period for the production of high-yield shelves. At this time, the fertilizer should be applied in time with the rain, so that the rape can grow steadily and not prematurely. It lays the foundation for large branches and high yields. After returning to the green stage, it is necessary to topdress the manure in the field with the top-dressing fertilizer, and apply 10 kg/mu of ammonium bicarbonate. At this time, urea should not be used. Because of its long-term fertilizer efficiency, it is easy to cause gluttony to ripen. Fertile land, good growing rapeseed fields, top dressing should be applied lightly; seedling fertilizer is not enough, weak growing rape, top dressing should be applied earlier. The rainfall is scarce and the soil is less applied when it is dry. In areas with conditions, top-dressing should be combined with irrigation.
Spray the foliar fertilizer in time for flowering. Rapeseed enters the flowering stage 15 to 20 days after convulsions, and it turns to reproductive growth, which is an important period for yield formation. At this time, it grows rapidly and the demand for water and fertilizer increases rapidly. Foliar fertilizer should be applied in time to meet rapeseed. Growth and development need to lay the foundation for high yield. Generally use 2% urea, 0.3% ~ 0.5% of potassium dihydrogen phosphate, 0.2% borax mixture, before the flowering period foliar spray, to overcome the "flower but not real", increase the flower, increase the angle, improve the fruit Rate, increase the number of grains, a thousand grain weight and oil content. Spray once every 7-10 days, spray 2 or 3 times continuously.
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