摘要
通过两年在两个点的田间试验，研究了滇中粮食高产区基于土壤Nmax测试进行小麦氮肥推荐的可行性。结果表明0-30cm土壤层初始无机氮可较好地用于代表土壤氮的供应能力。达到99％小麦相对产量时所需的最佳供氮量，在祥云点和宜良点分别为129、233kg·hm^-2，土壤剖面无机氮的不足部分应以氮肥加以补充，依此进行小麦氮肥推荐。
Field experiments had been carried out to investigate the feasibility of recommending optimal fertilizer N based on soil Nmin test in two separate sites for two years in success in the high yield central Ytmnan area. The results showed that the initial soil Nmin in soil layer at 0 - 30 cm could be used as the soil N supplying capacity for wheat. Even when coefficient factor between N supplying and relative yield of wheat, as well as cost of the test, were taken into consideration, Nmin. at 0 - 30 cm soil layer was the best one which represented soil N supplying capacity well. For the relative yield of wheat at 99% of target yield in Xiangyun and Yiliang, the optimal N supplying rate based on soil layers at 0 - 30 cm should be 129 k·hm^-2, 233 kg·hm^-2, respectively. And the gap between the required N supplying rate and soil Nmin had to be filled by fertilizer N.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2006年第3期21-23,30,共4页
Soil and Fertilizer Sciences in China
基金
云南省省院省校合作专项(项目编号98ZN04)
云南省自然科学基金(2004C0059M)
