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Application of organic fertilizers greatly affects soil quality and consequently plant health. Short-term application of manure may increase soil reaction. The possible mechanism is microbial decarboxylation of calcium-organic matter complex leading to the release and subsequent hydrolysis of calcium ions. It also affects the intake of chemical substances. The effect may vary among different types and origin of manures and their composition. On the contrary, nitrification is the process with the opposite effect on...