Manure application planner: Software for environmental and economical nutrient planning

Manure management recommendations and practices should be preceded by a whole-farm, comprehensive manure management plan, but manure planning aids have shortcomings that limit their widespread use. The Manure Application Planner (MAP), version 3.0, is a computer software tool used for developing or assessing manure application plans that meet environmental standards and achieve economic feasibility. Manure source quantity and analyses, field nutrient needs and nutrient sensitivity, and nutrient pricing and application cost information form the main categories of program input. Manure and fertilizer application rates are calculated using a linear programming optimization procedure or entered from a predetermined plan. The linear programming algorithm uses environmental, economic, and logistical constraints in its operation to develop an optimized plan. Or, with a producer's predetermined or existing plan, economic factors (fertilizer replacement value, application costs, and hauling costs) are presented and environmental concerns (excess nutrients) are shown. Output information includes manure and fertilizer application rates, total nutrient quantities of each source needed, excess nutrients applied from the manure, residual N availability for the following year, leftover stored manure (if any), and nutrient costs for each field and the farm with and without the use of manure. The combination of individualized input for each farm and/or field and access to the program's dataset coefficients allows for customized, farm-specific manure management plans.