MANNER-NPK is a practical software tool that provides farmers and advisers with a quick estimate of crop available nitrogen, phosphate, and potash supply from applications of organic manure. The program estimates the fate of organic manure N following land application, based on the latest research information on the mineralization of manure organic N, and N losses via ammonia volatilisation, denitrification, and nitrate leaching. The total N applied and an estimate of crop available N in the current cropping year and in the year following manure application is given.
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