南安县域甘薯的土壤养分丰缺指标研究

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

应用＂3414＂田间肥料试验设计的试验结果,旨在了解南安甘薯产区的N、P、K肥料施用效果,建立县域土壤的甘薯养分丰缺指标,并通过多元二次肥料效应函数寻求甘薯最高产量和最佳经济施肥量。甘薯施用N、P、K肥增产增效较为显著,其增产增收效果NPK〉N〉K〉P,单位肥料效益P〉N〉K。南安县域内甘薯的土壤养分丰缺等级指标划分为3级,即当土壤碱解氮、有效磷、速效钾养分含量分别为〈75 m g/kg、〈20 m g/kg、〈65 m g/kg时为低,在75~177 m g/kg、20~40 m g/kg、65~135 m g/kg时为中,〉177 m g/kg、〉40 m g/kg、〉135 m g/kg为高。甘薯推荐施肥量随土壤碱解氮、有效磷、速效钾含量的提高而减少。全市平均,甘薯最高产量施肥量为N 197.43 kg/hm2,P2O563.84 kg/hm2,K2O 226.32 kg/hm2;最佳经济施肥量N 179.74 kg/hm2,P2O561.10 kg/hm2,K2O 212.50 kg/hm2。

In this paper,＂3414＂field 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.