Validation of N-STaR Nitrogen Rate Recommendations and Evaluation of N-STaR Soil Sampling Procedures for Clay Soils in Arkansas
Title | Validation of N-STaR Nitrogen Rate Recommendations and Evaluation of N-STaR Soil Sampling Procedures for Clay Soils in Arkansas PDF eBook |
Author | Jarom Thane Davidson |
Publisher | |
Pages | 154 |
Release | 2016 |
Genre | Clay soils |
ISBN |
The two methods for determining N-fertilizer recommendations for rice (Oryza sativa L.) in Arkansas are the standard N recommendation (SR) based on soil texture, previous crop, and rice cultivar, and the Nitrogen-Soil Test for Rice (N-STaR) which quantifies the potentially mineralizable-N of the soil and provides a site-specific N recommendation. The N-STaR program has recently been developed, and the validation of N-STaR for clay soils is an important step in ensuring that N-STaR predicts correct N-fertilizer rates for rice under a delayed-flood production system. Small-plot trials located across Arkansas compared the N-STaR 95 and 100% relative grain yield (RGY) N rates applied as a single preflood (SPF) and a 2-way split (2-WS) application to the SR. The N-STaR N-fertilizer rate recommendations were equal to or less than the SR at all locations with differences ranging from -224 to 0 kg N ha-1. At all 13 sites, rice receiving the N-STaR 100% RGY N-fertilizer treatments yielded equal to or greater than the SR. Similar results were seen for the N-STaR 95% RGY fertilizer-N treatments, although rice receiving the 95% RGY SPF fertilizer-N rate yielded lower than the SR at three locations. The second objective was to examine potential sampling tools for their accuracy in collecting N-STaR soil samples while having the greatest ease-of-use. Alkaline hydrolyzable-N (AH-N) from soil samples collected by the N-STaR bucket and drill (BD), Kleen Hole Spade dry (KHS-D), Kleen Hole Spade lubricated with water (KHS-W), and Kleen Hole Spade lubricated with WD-40 (KHS-40) were compared against the dutch auger (DA) control. The alternative sampling methods were not statistically different in AH-N concentration from the DA, although all alternative methods had a tendency to overestimate AH-N compared to the DA and a correction value should be considered. The KHS-D showed the greatest utility in sampling clay soils and would be the best alternative method for encouraging the use of N-STaR in rice production on clay soils. In conclusion, this research validates the N-STaR N rate recommendations for rice on clay soils in Arkansas and highlights alternative sampling methods that may be employed in N-STaR soil sampling.
Estimating Nitrogen Credits from Poultry Litter on Silt Loam Soils in Arkansas Using the Nitrogen-soil Test for Rice
Title | Estimating Nitrogen Credits from Poultry Litter on Silt Loam Soils in Arkansas Using the Nitrogen-soil Test for Rice PDF eBook |
Author | Chester Eugene Greub |
Publisher | |
Pages | 186 |
Release | 2014 |
Genre | Nitrogen in agriculture |
ISBN | 9781303847110 |
Evaluation of Methods of Measuring Nitrogen Availability to Crops in New York Soils
Title | Evaluation of Methods of Measuring Nitrogen Availability to Crops in New York Soils PDF eBook |
Author | Jorge Ovidio Quintana |
Publisher | |
Pages | 186 |
Release | 1980 |
Genre | Soils |
ISBN |
Diagnostic Soil Testing for Nitrogen Availability
Title | Diagnostic Soil Testing for Nitrogen Availability PDF eBook |
Author | David W. James |
Publisher | |
Pages | 48 |
Release | 1978 |
Genre | Soils |
ISBN |
Evaluation of Soil Nitrogen Tests to Determine Soil Nitrogen Availability to Rice in Arkansas
Title | Evaluation of Soil Nitrogen Tests to Determine Soil Nitrogen Availability to Rice in Arkansas PDF eBook |
Author | William Jeremy Ross |
Publisher | |
Pages | 218 |
Release | 2007 |
Genre | Rice |
ISBN |
Recommended Chemical Soil Test Procedures for the North Central Region
Title | Recommended Chemical Soil Test Procedures for the North Central Region PDF eBook |
Author | North Dakota State University North Dakota Agricultural Experiment Station |
Publisher | |
Pages | 33 |
Release | 1980 |
Genre | Soils |
ISBN |
Alfalfa Management Guide
Title | Alfalfa Management Guide PDF eBook |
Author | D. J. Undersander |
Publisher | |
Pages | 0 |
Release | 2011 |
Genre | Alfalfa |
ISBN | 9780891181798 |
The Alfalfa Management Guide is designed especially for busy growers, with to-the-point recommendations, useful images of diseased plants and pests, and quick-reference tables and charts. Revised in 2011, this edition of Alfalfa Management Guide covers the latest strategies for alfalfa establishment, production, and harvest-soil testing, fertilizing, integrated pest management, rotation, and more.