Location: Plant Science Research
Project Number: 6070-11000-009-03-A
Project Type: General Cooperative Agreement
Start Date: Jan 1, 2014
End Date: Jul 31, 2017
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.).
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.