Rapeseed is very sensitive to phosphorus fertilizer, the soil is slightly deficient in phosphorus, although rape can sprout and flower, but there are few branches, few horns, not full grains, and many seeds; When there is a severe lack of phosphorus in the soil, the root system of rape grows poorly, the leaves become smaller, the leaves are dark purple, shrunken and cannot be flattened, and some plants wither and die. According to the test, rapeseed yield per kilogram increased by 0.9 kg per kilogram of superphosphate superphosphate, 1.2 kg per kilogram of rapeseed was increased by calcium, magnesium and phosphorus fertilizer, and 0.4~0.6 kg per kilogram of rapeseed was increased by phosphate rock powder.
The absorption of phosphorus in rape was the highest at the flowering stage, but from the perspective of phosphorus organic fertilizer utilization efficiency and yield increase effect, phosphorus application at seedling stage was the best. The experimental results showed that the utilization rate of phosphorus application before the second leaf stage was 17.3%, while the utilization rate of phosphorus application before the flowering stage was 8.5%, and the yield of rapeseed was only 27.4% of that of phosphorus application before the second leaf stage. Since phosphorus can be reused in rapeseed, the earlier the absorption period, the higher the utilization efficiency. Early application of phosphorus fertilizer can increase the concentration of plant cell sap, enhance cold resistance, resist frost damage, help ensure the safe wintering of rapeseed, promote early growth period, and increase the oil content of rapeseed by 0.5%~2.4%.
Phosphate fertilizer should be applied early, preferably as basal fertilizer and seed fertilizer, or as a fixed root fertilizer hole application when transplanting. If it is used as top dressing, it should be applied before the 5-leaf stage, and the dosage is generally 20~25 kg of superphosphate or calcium, magnesium and phosphorus fertilizer per mu. Soils with severe phosphorus deficiency or soils with a large amount of nitrogen fertilizer should be appropriately applied with more phosphorus fertilizer. Rapeseed root system has a special phosphorus absorption ability, and the phosphate fertilizer that is difficult to use in general crops has a good fertilizer effect on rapeseed, so rape can be planted in acidic soil, and a kind of retarded phosphate fertilizer such as phosphate rock powder can be applied.
Rapeseed phosphorus fertilizer application should be introduced here as soon as possible, I hope it will be helpful to everyone. If you want to buy high-quality and high-yield rapeseed seeds, you can download the seed bank App, and the country's excellent rapeseed varieties are available for everyone to choose.
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