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This version works with fertilizers only and has a conversion sheet for estimating nutrients on a square foot basis.
This version works with fertilizers and cover crops and makes calculations on a per acre basis.
Developed by University of Idaho for irrigated fields in their arid climate (Amber Moore, Christi Falen, Lauren Hunter, Glenn Shewmaker and David Graybill).
This quick guide illustrates the main steps used to use the calculator, the records sheet identifies the information needed to use the calculator.
This PNW Extension Publication explains how to sample cover crops, introduces a shortcut method for estimating cover crop plant-available nitrogen (PAN) release, describes the science behind cover crop PAN estimates, and uses on-farm case studies to address other frequently asked questions about cover crop PAN.
N. Andrews, D.M. Sullivan, J.W. Julian and K.E. Pool. 2011
Dan M. Sullivan, Ronjon Datta, Nick Andrews, and Kristin E. Pool. 2011
Eric S. Gale, Dan M. Sullivan, Craig G. Cogger, Andy I. Bary, Delbert D. Hemphill, and Elizabeth A. Myhre. 2006
Dan M. Sullivan and Nick A. Andrews, John M. Luna, and John P.G. McQueen. 2010
This work was sponsored by Western Sustainable Agriculture Research and Education (projects FW06-301 and FW09-328), Oregon Tilth, Inc. and the OSU Oregon Organic Cropping Research program.