Effect of different fertilization patterns on plant yield and soil fertility in lateritic red soil upland

Based on long-term experiment,the effect of different fertilization on crop yield and soil fertility of peanut-sweet potato rotation system in lateritic red soil was studied.The experimental results showed that the average yield of balanced fertilization treatment was the highest,compared with farm usual practice,the yield of peanut and sweet potato increased by 13.1%~13.5%,the net income increased by 14%,the increasing rate of NPK fertilization to peanut and sweet potato was improved year after year,but peanut and sweet potato were sensitive to lack of phosphorus and potassium.The trend of inter-annual yield showed that the coefficient of variation about the yield of peanut and sweet potato on usual practice higher than the balanced fertilization;The yield of no fertilization area and lack of NPK area decreased year and year;The yield of peanut was more sensitive than sweet potato in lack of N,the yield of sweet potato was more sensitive than peanut in lack of PK.The utilization rate of NPK of balanced fertilization 40.9%,17.7% and 24.2%;Supplying amounts of soil nutrients in the area lack of nutrient was nearly twice as much as the no fertilization area;All of soil organic matter improved,all of soil pH increased in nitrogen ferti lization area;The soil available nutrient in no fertilization area and the area lack of NPK was obviously decreased;Soil available phosphorus of balanced fertilization decreased by 22.5%,available nitrogen and available potassium basically kept constant,soil available phosphorus of balanced fertilization basically maintained,soil available nitrogen and available potassium respectively improved by 26.2% and 38.4%.