Paddy fields are cultivated year after year. Not only do they have to absorb large amounts of nitrogen, phosphorus, and potassium and a certain amount of calcium, magnesium, sulfur, and iron from the soil, but also absorb small amounts of chlorine, zinc, manganese, boron, and copper. Trace elements such as molybdenum are approximately 10 times that of nitrogen. A large number of nutrients are absorbed, and some are leached and lost. Supplementation by inorganic fertilizers alone is far from meeting the needs of rice production. Organic fertilizers and inorganic fertilizers must be applied in combination.
The application of organic fertilizers can not only provide a variety of nutrients for rice directly, but also enable a part of the organic matter to humectify and synthesize soil humus in the process of decomposition of organic matter by soil microorganisms, which improves soil physical properties and The structure has a great effect in increasing the quantity and quality of soil colloids and improving soil fertility and fertilizer supply capacity. In addition, in the process of organic matter decomposition, it is also possible to activate some of the delayed-phosphorus and potassium in the paddy soil and produce various physiologically active substances and vitamin B and auxin that promote rice growth.
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