Calculating the value of manure as a fertilizer source
Abstract
"Manure has value on a field only if it offsets the need to purchase other nutrients or soil amendments. The worksheet on page 2 allows users to calculate the fertilizer value of the manure for a specific field. Assemble the information specified in the input form (Table 1) before completing the work sheet. An example worksheet (Table 2) is included in the following section. Manure has characteristics that may reduce its value relative to that of commercial chemical fertilizers. Manure can be a less dependable nitrogen source and is perceived as a source of weed seeds. Because manure is an unbalanced fertilizer source, meeting crop needs for one nutrient may result in application of too much or too little of other crop nutrients. Low nutrient concentration in manure increases handling and application costs. Manure has positive attributes as well. It is a slow-release fertilizer, and the organic material can improve soil quality. The worksheet in this guide determines the value of manure only as a nutrient source, similar to commercial chemical fertilizers, regardless of its other attributes. Actual economic value of manure must be negotiated between the manure seller and the buyer."--First page.
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