Phosphorus uptake by rape was the highest at the flowering stage, but it was the best for the use of phosphorus at the seedling stage for phosphorus utilization and yield increase. Since phosphorus can be used repeatedly in rapeseed, the earlier the absorption period, the greater the efficiency. The application of phosphate fertilizer can promote early growth period, the general seedling stage can be advanced 2-4 days, flowering stage 2-6 days, mature period 1-2 days. Phosphorus in rape can also increase the oil content by 0.5-2.4%. Therefore, there is a common name for "non-phosphorus-free oil." Phosphorus fertilizer consumption is generally 20-25 kilograms of superphosphate or calcium magnesium phosphate fertilizer per acre. Soils with severe phosphorus deficiency or soils with a large amount of nitrogen fertilizer should be applied in appropriate amounts. The root system of rapeseed has a special ability to absorb phosphorus. Generally, the phosphate fertilizer which is difficult to use in crops has a good fertilizer effect on rapeseed. Therefore, rapeseed can be applied to acidic soil and a type of delayed phosphate fertilizer can be applied.
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