The Nan′an county territpry soil sweet potato nutrient abundant lacks the target to stuty

In this paper,3414field test results of fertilizer experiments designed to learn more about sweet potato producing areas Nan'an N,P,K fertilizer application in effect,the establishment of county-level soil nutrient abundance of sweet potato shortage of targets,and through multi-quadratic function of fertilizer for sweet potato the maximum yield and optimum economic fertilizer.Sweet potato application of N,P,K fertilizer increasing production efficiency was more significant,the effect of yield increase NPK N K P,units of fertilizer efficiency P N K.Nan'an sweet potato the county level indicators of soil nutrients was divided into three,namely,when the soil nitrogen,phosphorus,potassium nutrient levels were 75 mg / kg,20 mg/kg,65 mg / kg when low,in the 75 ~ 177 mg/kg,20 ~ 40 mg/kg,65~135 mg/kg when in,177 mg/kg,40 mg/kg,135 mg/kg higher.Recommended sweet potato fertilizer with soil nitrogen,available phosphorus,available potassium increased and reduced the city's average,the highest yield of sweet potato fertilizer quantity 197.43 kg/hm2 N,63.84 kg/hm2 P2O5,226.32 kg/hm2 K2O;the best economic fertilization 179.74 kg/hm2N,61.10 kg/hm2 P2O5,212.50 kg/hm2 K2O.