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RESEARCH PRODUCT

Review on Physiological Effects of Vermicomposts on Plants

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description

Vermicompost is a type of organic fertilizer produced by earthworms and their symbiotic microorganisms. In addition to nutrient-rich organic fraction, vermicomposts also contain plant-available soluble minerals as well as substances with plant growth-regulating activity. In order to promote understanding on beneficial effects of vermicompost in different farming systems, the aim of the present review is to analyze possible mechanisms of vermicompost action on plants. After overview of plant growth-affecting activity of vermicomposts at the level of seed germination and vegetative growth, detailed analysis is dedicated to physiological effects associated with mineral nutrition: changes in both soil mineral nutrient availability and their uptake. Further, additional plant growth-regulating activity is considered, with emphasis on plant hormonelike compounds and humic substances. Information on activation of plant metabolism by vermicompost application is given at the level of photosynthesis-related parameters and defense responses. Approaches of evaluation of vermicompost quality based on physiological criteria are described, followed by summary on use of vermicompost in different farming systems.