Effects of Different Proportions of Slow-release Fertilizer on Rape Growth and Soil Nutrients

The effects of different proportions of slow-release fertilizer and fast-release fertilizer on rape growth and soil nutrients in the condition of the same total nitrogen content were studied with a pot experiment.The results indicated that compared with the CK(no fertilizer used),an increase in the rape biomass,soil nitrogen,phosphorus and potassium content of other treatments were observed,and the larger proportion of slow-release fertilizer in the base fertilizer improved the content of total nitrogen,phosphorus and potassium in rape.The soil nitrogen content of treatments with slow-release fertilizer was low in the early days,but increased after 20 days.Soil phosphorus and potassium contents had positive correlations with the proportion of slow-release fertilizer.The nutrient release rate of slow-release fertilizer was from slow to fast and then slow,and the release peak of slow-release fertilizer just met the nutrient requirement of rape growth,which could not only improve fertilizer efficiency,but also improve rape biomass.