滴灌施肥对棉田土壤速效养分的影响研究

采用田间抽样调查分析的方法,研究了滴灌施肥对西北内陆地区棉田土壤速效养分的影响。结果表明,地下滴灌条件下,土壤碱解氮和有效钾的含量随距离毛管位置增加而增加,而有效磷的趋势则相反;膜下滴灌施肥条件下,有效钾和有效磷的趋势与地下滴灌一致,而碱解氮的趋势则是毛管处最高;滴灌施肥条件下,0～100 cm土体中土壤养分残留量膜下滴灌一般高于地下滴灌,尤其是氮的残留量较高。

Effect of Drip Fertigation on Soil Available Nutrients in Cotton Field,Northwest China

Method of field sampling and analysis was adopted to study the effect of fertigation on soil available nutrients in the inland cotton field of Northwest China.The results showed that under the conditions of subsurface drip irrigation,content of soil alkali dissolved nitrogen and available potassium increased with the distance from drip line increasing,while the opposite trend in available phosphorus.Under the conditions of mulched drip irrigation,the trends of soil available potassium and available phosphorus were consistent with those of subsurface drip irrigation,while the trend of the nitrogen was higher near the drip line.The residual soil nutrients from 0 to 100 cm of mulched drip irrigation were generally higher than those of subsurface drip irrigation,especially the residual nitrogen.