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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 Pennsylvania

Location: Plant Science Research

Project Number: 6070-11000-008-24
Project Type: General Cooperative Agreement

Start Date: Jan 14, 2014
End Date: Jul 31, 2016

Objective:
Develop a practical decision support system to improve N fertilizer recommendations for corn in Pennsylvania 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 Pennsylvania. 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. Research in Pennsylvania will leverage 10 site-years of cover crop experiments focused on assessing N retention and supply from cover crop monocultures and mixtures. We will also leverage three on-farm cover crop experiments conducted during two growing seasons to further test the predictive abilities of the flush of CO2.

Last Modified: 12/18/2014
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