@article {10.3844/ajabssp.2011.172.179,
article_type = {journal},
title = {Corn (Zea Mays L.) Plant Characteristics and Grain Yield Response to N Fertilization Programs in No-Tillage System},
author = {Liu, Kesi and Wiatrak, Pawel},
volume = {6},
year = {2011},
month = {Mar},
pages = {172-179},
doi = {10.3844/ajabssp.2011.172.179},
url = {https://thescipub.com/abstract/ajabssp.2011.172.179},
abstract = {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.},
journal = {American Journal of Agricultural and Biological Sciences},
publisher = {Science Publications}
}