Early spring topdressing can remedy the lack of winter growth of rapeseed, promote multi-branched, early bud, is the key to capturing high yield. Spraying with 15-20 kg of ammonium bicarbonate or 6-7 kg of urea with fresh high fat film can improve fertilizer efficiency and protect fertilizer.
Second, we must skillfully apply fertilizer.
The rapeseed bud period is the key period for the rapeseed spring to take the shelf. For the field where the base fertilizer is insufficient, the seedling is weak, and the growth is poor, the field should be applied early; for the field with strong seedlings, the manure should be delayed and light. Shi.
Three to foliar application of boron.
The phenomenon of "flowers and not real" in rapeseed is generally a physiological disease caused by boron deficiency. After the spring rapeseed, apply boron, 50-100 grams of borax each time, dissolve with hot water, then 50-60 kg of fresh water + new high-fat film, spray once in the flood season and early flowering period, and greatly improve the effectiveness of fattening. The utilization rate of ingredients plays a preventive role.
Fourth, we must apply flower fertilizer.
Appropriate amount of supplemental application of flower fertilizer, flower fertilizer generally adopts foliar spray, and sprays strong spikes, which can make rapeseed more firm, increase grain and gain weight.
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