右江河谷稻作区“稻—稻—菜”栽培模式肥料利用率试验

Experiment on fertilizer utilization rate in cultivation model of "rice-rice-vegetable" at Youjiang Valley

肥料利用率是当季作物吸收营养元素与施入土壤的营养元素总量的百分数。通过试验,右江河谷稻作区"稻—稻—菜"栽培模式一个年度内氮、磷、钾养分利用率分别为33.48%、18.96%、50.1%。在2008年度年降雨量1 194.3mm的情况下,养分的流失量分别为:氮1.243kg/667m2年,磷0.011kg/667m2年。

Fertilizer utilization rate is a percentage of seasonal absorbed nutrients comparing with applied nutrients into soil.By means of experiment at Youjiang Valley＇s ＂rice-rice-vegetable＂ model,the yearly N,P,K ＇s utilization rates are 33.48%,18.96% and 50.1% respectively.Under the condition of 1194.4 mm rainfall in 2008,the yearly nutrient losses of N,P are 1.243kg/667m2 and 0.011kg/667m2 respectively.