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United States Department of Agriculture

Agricultural Research Service

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Research Project: Biologically Based Fertilizer Recommendations to Meet Yield Expectations and Preserve Water Quality in Virginia

Location: Plant Science Research

Project Number: 6645-11000-008-23
Project Type: General Cooperative Agreement

Start Date: Jan 01, 2014
End Date: Jul 31, 2017

Objective:
Develop a practical decision support system to improve N fertilizer recommendations for corn in Virginia based on a biologically based soil test that can predict N mineralized from soil organic matter during the growing season and from rapidly decomposable substrates supplied prior to the growing season (e.g. cover crops, previous crop residues, manure additions, etc.).

Approach:
Research will evaluate N supplied to corn in multiple field experiments in Virginia. Crop yield responses will be evaluated with pre-season flush of CO2, permanganate oxidizable C, pre-sidedress nitrate test, and end-of-season basal stalk nitrate test. Field experiments will be conducted annually in the Coastal Plain region of Virginia in corn/small grain/soybean rotation. In these trials, experimental design will be a split plot with cover crop as the main plot (rye, hairy vetch, rye+vetch) and N rates on corn as subplots. In the Shenandoah Valley, sites will be corn/small grain forage rotation. Cover crops will vary, but include small grain, crimson clover, and diacon radish.

Last Modified: 8/30/2014
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