Rapeseed is very sensitive to phosphate fertilizer, and the soil is slightly deficient in phosphorus. Although rapeseed can twitch and flower, it has fewer branches, less pods, less grain, and more glutinous grains. When the soil is seriously deficient in phosphorus, the roots of rapeseed are poorly grown and leafy. Small, the leaves are dark purple, shrinking and not flattening, and some plants wither and die. According to the test, rapeseed applied 0.9 kg of rapeseed per kilogram of fermented calcium, 1.2 kg of rapeseed per kilogram of calcium magnesium phosphate fertilizer, and 0.4-0.6 kg of rapeseed per kilogram of phosphate rock.
The absorption of phosphorus by rapeseed was the most in the flowering period, but from the perspective of the utilization rate of phosphorus organic fertilizer and the effect of increasing yield, it was best to apply phosphorus at the seedling stage. The experimental study showed that the utilization rate of phosphorus before rapeseed 2 leaves was 17.3%, while the utilization rate of phosphorus before the pumping stage was 8.5%, and the yield of rape was only 27.4% of phosphorus before the 2 leaf stage. Since phosphorus can be repeatedly used in rapeseed, the earlier the absorption period, the higher the utilization efficiency. Early application of phosphate fertilizer can increase the concentration of plant cell fluid, enhance cold resistance, resist frost damage, help ensure the safe wintering of rapeseed, promote the early growth period, and increase the oil content of rapeseed by 0.5% to 2.4%.
Phosphate fertilizer should be applied early, as base fertilizer and seed fertilizer application, or as rooting fertilizer when transplanting. If used as top dressing, it should be applied before the 5 leaf stage, the amount is generally 20 ~ 25 kg per calcium per calcium or calcium magnesium phosphate fertilizer. For soils with severe phosphorus deficiency or soils with a large amount of nitrogen fertilizer, appropriate application of phosphate fertilizer should be applied. 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. Therefore, in the acid soil, rapeseed can be used as a kind of delayed phosphate fertilizer.
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