EVALUATION OF NITROGEN APPLICATION METHODS AND RATES WITH NUTRISPHERE-N ON CORN IN SOUTHEASTERN COASTAL PLAINS
- 1 Clemson University, United States
Application method of Nitrogen (N) and Nutrisphere-N may influence corn (Zea mays L.) growth and yields under dryland conditions. The objective of this study was to determine the effect of two N application methods (all at planting and split application with 35 kg N ha-1 applied at planting and remaining N at V6 stage) and five N rates (0, 45, 90, 135 and 180 kg N ha-1) with and without Nutrisphere-N polymer on dryland corn near Blackville, SC from 2010 to 2012. Compared to control, Nutrisphere-N polymer improved corn grain yield by 33.3 and 29.5% at 90 and 135 kg N ha-1 applied at planting and 12.1, 12.9, 22.0 and 31.2% at 45, 90, 135 and 180 kg N ha-1 applied in split applications, respectively. Chlorophyll improved in corn leaves by 19.3% at 8 weeks after planting with application of 45 kg N ha-1 and Nutrisphere-N at planting. Split N application with Nutrisphere-N slightly improved chlorophyll in corn leaves. Nutrisphere-N increased plant LAI at 8 weeks after planting by 10.2% at 135 kg N ha-1 in split applications and LAI at 16 weeks after planting by 50.4, 56.2, 59.4 and 70.7% at 45, 90, 135 and 180 kg N ha-1 with split applications, respectively. Plant NDVI at 16 weeks after planting corn improved with Nutrisphere-N by 9.3, 11.5, 13.0 and 9.2% with N applied at planting and 16.0, 12.9, 10.2 and 14.3% with split N applications at 45, 90, 135 and 180 kg ha-1, respectively. Nutrisphere-N increased grain N by 4.5% at 135 kg N ha-1 applied to corn at planting and 5.2% at 90 kg N ha-1 applied in split applications. Generally, N applications with Nutrisphere-N positively improved growth parameters and yields of corn.
Copyright: © 2014 Pawel Wiatrak. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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- Normalized Difference Vegetation Index (NDVI)
- Leaf Area Index (LAI)