【摘要】 采用盆栽试验方法,以湖北棉田13个代表性土样为供试土壤,以同位素AN值为标准,对国内外常用和新近推荐的六种土壤有效氮素分析方法——碱解氮,还原碱解氮,电超滤全氮(EUF—TN),沸水提取、自动分析仪测定,热水提取、自动分析仪器测定,热水提取、紫外测定法进行比较筛选。确证了同位素AN值法能真实反映土壤的实际供氮能力;筛选出了其中与AN值法相关性最好的,适用于我省旱地土壤并较简便的还原碱解氮分析法,进而用同位素法对这一方法作了校正,证明效果更佳。更多还原

【Abstract】 It is an important prerequisite to select a soil available nutrient testing method suitable to local soil condition for making a correct fertilizer recommendation.In this study, we chose different stair grade of available N content of 3 major types of upland soils of Hubei Province as samples, and used isotope As value ass standard, for screening an adoptable soil available N testing method from the following six melhods, alkali hydrolysable N (AH-N) ; reducible alkali hydrolysable N (RAH-N) ; EUF-total N; boil water extractable N; hot water extractable-colorimetrically detected N; hot water extractable-UV detected N.It was confirmed that, isotope As value method could really reflect soil N supplying power, and screened out RAH-N as an adoptable and simple and convenient method which was of best correlation with isotope As value and suitable to upland soils of Hubei ProvinceBut this method couldn’t reflect the stimulating effect of ferlilizer N to soil N and then the exact level of soil N supplying power. And therefore, we put forward a suggestion of feasibility of correcting RAH-N with isotupe An value更多还原