Yes, manure is a valuable fertilizer for composts, but you should be aware that proper use of manure and compost is essential from both a production and environmental standpoint. Applying rates that are too low can lead to nutrient deficiency and low yields, yet too high a rate can lead to nitrate leaching, phosphorus runoff, accelerated eutrophication of lakes, and excessive vegetative growth of some crops. Understanding how to manage manure is important for vegetable producers who have access to an economical supply of manure, compost, or other organic nutrient sources. If you’re serious about adding manure to your compost, you should thoroughly read the following website for more detailed information: http://www.extension.umn.edu/distribution/horticulture/M1192.html
Mixing manure into your compost pile is not necessary for successful composting but it is definitely beneficial because it adds more nutrients. The link below is full of great information about composting with manure.
“Manure and compost not only supply many nutrients for crop production, including micronutrients, but they are also valuable sources of organic matter. Increasing soil organic matter improves soil structure or tilth, increases the water-holding capacity of coarse-textured sandy soils, improves drainage in fine-textured clay soils, provides a source of slow release nutrients, reduces wind and water erosion, and promotes growth of earthworms and other beneficial soil organisms. Most vegetable crops return small amounts of crop residue to the soil, so manure, compost, and other organic amendments help maintain soil organic matter levels.”
“Fresh, non-composted manure will generally have a higher N content than composted manure (Table 1). However, the use of composted manure will contribute more to the organic matter content of the soil.”
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