What are the impacts of organic soil amendments on soil health?

Evaluating the bioavailability and speciation of trace elements in native soil and in soil mixed with organic amendments is crucial for determining the environmental impact of contaminated soils. Researchers do not fully agree on the nutritional composition of crops grown with organic products, and organic fertilizers come from municipal wastewater (SS) sludge, chicken manure (CM), horse manure (HM), blood and bone meal, and all fertilizers are examples of organic fertilizers. There is increasing scientific evidence on the positive quality aspects of organically produced foods, such as a higher content of dry matter and vitamins and better storage quality. In fact, the comparisons between organic and conventionally grown crops are not experimentally valid because of the variation in crop varieties, the timing of fertilization, and management and storage after harvest.

At KSU, numerous studies have been conducted on organic soil amendments and their impact on crop yield and quality, soil erosion and nutrient availability, the activity of soil enzymes, and the bioremediation of heavy metals in organic amendments. Soil carbon includes both inorganic carbon and carbonate minerals and organic carbon as soil organic matter. They found no difference in acidity, sweetness and bitterness, but they did find that the organic tomatoes were less firm, less juicy and redder. Phytostabilization of metals in mining soils using Brassica juncea in combination with organic amendments.

With an increasing emphasis on the sustainability of fertility and respect for the environment, the restoration of soil microbial ecology has become important. All materials, living or dead, contain chemical compounds; therefore, organic agriculture uses chemicals. Effect of different rates of composted organic modification on urban land properties, growth and nutritional status of three species of hedges native to the Mediterranean. Consequently, waste in general and organic waste in particular are increasingly seen as potential resources.

The rate of application of amendments to agricultural soil is proposed in accordance with nitrogen, phosphorus and potassium requirements. This series of soil-focused fact sheets, aimed at members of the technical assistance community who advise California producers on climate-smart agriculture, provides an overview of carbon agriculture and addresses the potential benefits of compost, powdered rock and biochar as soil amendments.

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