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Harry A. J. Hoitink, The Ohio State University, Ohio Agricultural Research and Development Center, Plant Pathology; Daniel A. Herms, Pierluigi Bonello, |
Composts and mulches can be used successfully to enhance tree health. Unfortunately, application of these organic amendments can also have negative effects. The most critical factors that contribute to success or failure associated with utilization of organic mulches and composts are reviewed here.
When used properly, composted organic matter applied as mulches or incorporated into the soil benefits plant health through several mechanisms. It is best to apply composted products, but if fresh organic matter must be used, it should be applied in the late fall or winter. Compost analysis, soil test results, and crop need should together form the basis for determining application rates. Do not apply more available mineral nutrients than is required by the crop. The frequency of application varies from crop to crop and product to product. It is most important to use these products when trees are first planted or when lawns are first established.