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Position: Home > Articles > Fate of 15N-labeled urea under a winter wheat-summer maize rotation on the North China Plain. Pedosphere 2007,17 (1)

Fate of 15N-labeled urea under a winter wheat-summer maize rotation on the North China Plain.

作者：

Ju XiaoTang;Liu XueJun;Pan JiaRong;Zhang FuSuo

单位：

;Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China.

关键词：

ammonium nitrogen;application rates;crop yield;leaching;maize;nitrate nitrogen;nitrogen fertilizers;nutrient balance;rotations;soil fertility;urea;wheat;winter wheat

摘要：

A field experiment was conducted to investigate the fate of 15N-labelled urea and its residual effect under the winter wheat (Triticum aestivum) and summer maize (Zea mays) rotation system on the North China Plain (Beijing). Compared to a conventional application rate of 360 kg N ha-1 (N360), a reduced rate of 120 kg N ha-1 (N120) led to a significant increase (P<0.05) in wheat yield and no significant differences were found for maize. However, in the 0-100 cm soil profile at harvest, compared with N360, N120 led to significant decreases (P<0.05) of percent residual N and percent unaccounted-for N, which possibly reflected losses from the managed system. Of the residual fertilizer N in the soil profile 25.6-44.7% and 20.7-38.2% for N120 and N360, respectively, were in the organic N pool, whereas 0.3-3.0% and 11.2-24.4%, correspondingly, were in the nitrate pool, indicating a higher potential for leaching loss associated with application at the conventional rate. Recovery of residual N in the soil profile by succeeding crops was less than 7.5% of the applied N. For N120, total soil N balance was negative; however, there was still considerable mineral N (NH4+-N and NO3--N) in the soil profile after harvest. Therefore, N120 could be considered agronomically acceptable in the short run, but for long-term sustainability, the N rate should be recommended based on a soil mineral N test and a plant tissue nitrate test to maintain the soil fertility..

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Fate of 15N-labeled urea under a winter wheat-summer maize rotation on the North China Plain.

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