作 者: ; ; ; ; ; (韩登武); (白书军); (李宝林);
机构地区: 石河子大学农学院农业资源与环境系
出 处: 《新疆农业科学》 2007年第5期599-603,共5页
摘 要: 利用田间原位测定,分析了不同肥力土壤氮素矿化规律,可用Logistic累积函数加以模拟,决定系数均达到显著水平,不同肥力土壤氮素矿化量之间存在显著差异,土壤氮素总矿化量占棉花吸氮量的65%-79%,因此,在施肥前,针对不同肥力的田块,利用模型估计土壤某一阶段氮素矿化量,进行氮肥分期动态调控,模型的作用是不可低估的。 Soil nitrogen mineralization under different fertility level in field was studied. The results demonstrated that correlation coefficients and the amount of soil mineralized nitrogen showed a high significance. The amount of soil mineralized nitrogen occupied 65% - 79% of the total nitrogen absorbed by cotton plant. Therefore, model played an important role in predicting the amout of different fertility level soil mineralized nitrogen in some growth stages before nitrogen applying.