MANURE NITROGEN CREDITS SIMPLIFIED

摘要

Calculation of plant available nitrogen (N) from manure is an important step a cropping system budget. However, there is some difficulty associated with sorting through the numerous tables of coefficients in order to calculate plant available N from manure. This complexity has resulted in many producers not getting accurate manure N credit estimates for their manure applications. For some Ontario producers, the tables in OMAFRA Publication 811 (Field Crop Agronomy Guide) can be used to calculate manure credits, for others the NMAN2 software is used to arrive at these estimates. Our aim was to provide a simplified calculator (Excel spreadsheet) which would assist more producers in arriving at the most appropriate estimates of plant available nutrients in their manure applications.