On-farm estimation of indigenous nitrogen supply for site-specific nitrogen management in the North China plain

文献类型： 外文期刊

第一作者： Cui, Zhenling

作者： Cui, Zhenling;Zhang, Fusuo;Chen, Xinping;Miao, Yuxin;Li, Junliang;Shi, Liwei;Xu, Jiufei;Ye, Youliang;Liu, Chunsheng;Yang, Zhiping;Zhang, Qiang;Huang, Shaomin;Bao, Dejun

作者机构：

关键词： indigenous nitrogen supply;soil N supply;apparent N mineralization;soil organic matter

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

ISSN： 1385-1314

年卷期： 2008 年 81 卷 1 期

页码：

收录情况： SCI

摘要： Estimating indigenous nitrogen supply (INS) by measurement of crop N uptake in N omission plots for site-specific N management is not feasible on a routine basis because it involves destructive plant sampling and plant tissue analysis, which is time-consuming and expensive. The objective of this study was to determine the amount of INS and develop a method to estimate it using soil testing in the North China plain (NCP). On-farm experiments at 229 sites were conducted from 2003 to 2005 in seven key winter wheat (Triticum aestivum L.)/summer maize (Zea mays L.) production regions of the NCP. The mean INS during the wheat-growing season was129 kg N ha(-1) with a range from 62 to 212 kg N ha(-1), and it varied from 69 to 202 kg N ha(-1) with a mean of 142 kg N ha(-1) during the maize-growing season. Considering all sites, the variability of INS was not simulated by initial soil N (min) or apparent N mineralization (N (organic)) alone, while together they could explain about 38% and 60% of INS during the wheat and maize-growing seasons, respectively. During the wheat-growing season, mean N (organic) was 63 kg N ha(-1), and 59% and 33% of its variation could be explained by SOM in high-yielding regions (mean yield, 7.6 t ha(-1)) and low-yielding regions (mean yield, 5.3 t ha(-1)), respectively. Mean N (organic) during the maize-growing season was 109 kg N ha(-1), 22% of which could be explained by SOM across all sites. An average of 40% and 42% of INS variation could be explained by both SOM and initial soil N (min) content during the wheat and maize-growing seasons, respectively. We conclude that the accuracy of estimating crop N requirement for site-specific N management will be increased by using initial soil N (min) and SOM.

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