Interactions between non-flooded mulching cultivation and varying nitrogen inputs in rice-wheat rotations

文献类型： 外文期刊

第一作者： Jiang, RF

作者： Jiang, RF;Liu, XJ;Zhang, FS;Lu, SH;Zeng, XZ;Christie, P

作者机构：

关键词： rice-wheat cropping systems;non-flooded mulching cultivation;productivity;nitrogen balance;plastic film;straw management

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2005 年 91 卷 2-3 期

页码：

收录情况： SCI

摘要： A 3-year field experiment examined the effects of non-flooded mulching cultivation and traditional flooding and four fertilizer N application rates (0, 75, 150 and 225 kg ha(-1) for rice and 0, 60, 120, and 180 kg N ha(-1) for wheat) on grain yield, N uptake, residual soil N-min and the net N balance in a rice-wheat rotation on Chengdu flood plain, southwest China. There were significant grain yield responses to N fertilizer. Nitrogen applications of > 150 kg ha(-1) for rice and > 120 kg ha(-1) for wheat gave no increase in crop yield but increased crop N uptake and N balance surplus in both water regimes. Average rice, grain yield increased by 14% with plastic film mulching and decreased by 16% with wheat straw mulching at lower N inputs compared with traditional flooding. Rice grain yields under SM were comparable to those under PM and TF at higher N inputs. Plastic film mulching of preceding rice did not affect the yield of succeeding wheat but straw mulching had a residual effect on succeeding wheat. As a result, there was 17-18% higher wheat yield under NO in SM than those in PM and TF. Combined rice and wheat brain yields under plastic mulching was similar to that of flooding and higher than that of straw mulching across N treatments. Soil mineral N (top 60 cm) after the rice harvest ranged from 50 to 65 kg ha(-1) and was unaffected by non-flooded mulching cultivation and N rate. After the wheat harvest, soil N-min ranged from 66 to 88 kg N ha(-1) and increased with increasing fertilizer N rate. High N inputs led to a positive N balance (160-621 kg ha(-1)), but low N inputs resulted in a negative balance (-85 to -360 kg ha(-1)). Across N treatments, the net N balances of SM were highest among the three cultivations systems, resulting from additional applied wheat straw (79 kg ha(-1)) as mulching materials. There was not clear trend found in net N, balance between PM and TF. Results from this study indicate non-flooded mulching cultivation may be utilized as an alternative option for saving water, using efficiently straw and maintaining or improving crop yield in rice-wheat rotation systems. There is the need to evaluate the long-term environmental risks of non-flooded mulching cultivation and improve system productivity (especially with straw mulching) by integrated resource management. (C) 2004 Elsevier B.V. All rights reserved.

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