Rapeseed is a phosphorus-producing crop, especially in the flowering period, but from the utilization rate of phosphorus fertilizer and the effect of increasing yield, it is best to apply phosphorus in the seedling stage. Phosphorus can be reused in the rapeseed, so the earlier the absorption period, The higher the efficiency. Early application of phosphate fertilizer can increase the concentration of plant cell fluid, enhance cold resistance, resist frost damage, and ensure that rapeseed can be safely wintered. It can also promote early growth and increase oil content.
Therefore, the phosphate fertilizer should be applied early, and it is better to use it as a base fertilizer and seed fertilizer or as a fixed fat point when transplanting. If it is too late to apply phosphorus when planting, it should be applied before the 5-leaf stage. The earlier the effect, the better. Generally, 20-25 kg of superphosphate or calcium magnesium phosphate fertilizer per mu can be used. Soils with severe phosphorus deficiency or soil with more nitrogen fertilizer should be applied more appropriately. The root system of rapeseed has a special ability to absorb phosphorus. The phosphate fertilizer which is difficult to use in general crops has good fertilizer effect on rapeseed. In rapeseed soil, it can be used as a kind of phosphate fertilizer.
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