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Problem statement: Nitrogen application timing and Nitrogen (N) rate are two important&#13; factors to influence corn production in No-Tillage (NT) system, but N recommendations may need to&#13; be revised due to insufficient rainfall in dryland rain-fed environment. Approach: This study was to&#13; determine the effects of two N application timing (planting and split application at planting and V6&#13; corn growth stage) and five N rates (0, 45, 90, 135 and 180 kg N ha&#8722;1) on corn plant characteristics and&#13; grain yield under rain-fed and low corn yield environment. Plant characteristics included the&#13; measurement of plant height, ear height, relative chlorophyll content (SPAD) and normalized&#13; Difference Vegetation Index (NDVI). Results: Plant height and ear height at R1 stage, SPAD at R1&#13; and NDVI at V8 and R1 increased significantly with increasing N rates, while N application timing&#13; had no effect on measured canopy characteristics. Grain yield increased from 2.2-3.8 Mg ha&#8722;1 as N rate&#13; changed from 0-180 kg ha&#8722;1. However, applying more than 90 kg N ha&#8722;1 did not significantly increase&#13; grain yields. The N application timing did not influence yield. Strong correlations were observed&#13; among corn plant characteristics and between plant NDVI at V8 and R1 stages and grain yields.&#13; Conclusion: These results indicate that N application timing was not important factor to affect corn&#13; plant characteristics and grain yield under rain-fed and low corn yield dryland conditions and we may&#13; not expect a significant grain yield increase with application exceeding 90 kg N ha-1 under these&#13; conditions. Plant NDVI at V8 and R1 stage could be a good indicator to predict corn grain yield

Corn (<i>Zea Mays</i> L.) Plant Characteristics and Grain Yield Response to N Fertilization Programs in No-Tillage System