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首页> 外文期刊>American journal of agricultural and biological sciences >Corn (Zea mays L.) plant characteristics and grain yield response to N fertilization programs in no-tillage system.
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Corn (Zea mays L.) plant characteristics and grain yield response to N fertilization programs in no-tillage system.

机译：免耕体系下玉米（N. Zea mays L.）的植株特性和产量对N施肥方案的响应。

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Problem statement: Nitrogen application timing and Nitrogen (N) rate are two important factors to influence corn production in No-Tillage (NT) system, but N recommendations may need to be revised due to insufficient rainfall in dryland rain-fed environment. Approach: This study was to determine the effects of two N application timing (planting and split application at planting and V6 corn growth stage) and five N rates (0, 45, 90, 135 and 180 kg N ha-1) on corn plant characteristics and grain yield under rain-fed and low corn yield environment. Plant characteristics included the measurement of plant height, ear height, relative chlorophyll content (SPAD) and normalized Difference Vegetation Index (NDVI). Results: Plant height and ear height at R1 stage, SPAD at R1 and NDVI at V8 and R1 increased significantly with increasing N rates, while N application timing had no effect on measured canopy characteristics. Grain yield increased from 2.2-3.8 Mg ha-1 as N rate changed from 0-180 kg ha-1. However, applying more than 90 kg N ha-1 did not significantly increase grain yields. The N application timing did not influence yield. Strong correlations were observed among corn plant characteristics and between plant NDVI at V8 and R1 stages and grain yields. Conclusion: These results indicate that N application timing was not important factor to affect corn plant characteristics and grain yield under rain-fed and low corn yield dryland conditions and we may not expect a significant grain yield increase with application exceeding 90 kg N ha-1 under these conditions. Plant NDVI at V8 and R1 stage could be a good indicator to predict corn grain yield.Digital Object Identifier http://dx.doi.org/10.3844/ajabssp.2011.172.179
机译：问题陈述：氮肥施用时机和氮（N）含量是影响免耕（NT）系统玉米产量的两个重要因素，但由于旱地雨育环境下降雨不足，可能需要修改氮的建议。方法：本研究旨在确定两次施氮时机（播种和在玉米V6生长阶段分批施药）和五个施氮量（0、45、90、135和180 kg N ha < / sup>）在雨育和低玉米产量环境下的玉米植株特性和谷物产量。植物特征包括植物高度，穗高，相对叶绿素含量（SPAD）和归一化植被指数（NDVI）的测量。结果：随着施氮量的增加，R1阶段的株高和穗高，R1的SPAD和V8和R1的NDVI显着增加，而施氮时间对测得的冠层特性没有影响。随着氮素含量从0-180 kg ha -1 的变化，谷物产量从2.2-3.8 Mg ha -1 增加。但是，施用超过90 kg N ha -1 并不能显着提高谷物产量。施氮时间不影响产量。在V8和R1阶段，玉米植株特性之间以及植株NDVI与谷物产量之间存在很强的相关性。结论：这些结果表明，在雨育和低玉米单产旱地条件下，氮素施用时间不是影响玉米植株特性和籽粒产量的重要因素，超过90 kg N ha -1 。在V8和R1阶段种植NDVI可能是预测玉米籽粒产量的良好指标。数字对象标识符http://dx.doi.org/10.3844/ajabssp.2011.172.179

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