1：Soil improvement and fertility improvement After applying organic fertilizer into the soil,organic matter can effectively improve the soil physical and chemical conditions and biological characteristics,ripen the soil,enhance the ability of soil to maintain and supply fertilizer and buffer,and create good soil conditions for crop growth.
2：Increase production and improve quality.Organic fertilizer is rich in organic matter and various nutrients,providing nutrients for agricultural crops.After decomposition of organic fertilizer,it provides energy and nutrients for soil microbial activities,promotes microbial activities,accelerates decomposition of organic matter,and produces active substances that can promote crop growth and improve agricultural products
3：Improve fertilizer utilization rate.Organic fertilizer contains a variety of nutrients,but its relative content is low,and its release is slow,while chemical fertilizer has high nutrient content per unit,low composition,and fast release.The two can be reasonably applied and complement each other to decompose organic matter.The organic acid produced can also promote the dissolution of mineral nutrients in soil and fertilizer.Chemical fertilizer and organic fertilizer promote each other,which is beneficial to crop absorption and improve fertilizer utilization rate.
1.Provide complete and relatively coordinated nutrition.
Organic fertilizers contain nutrients and beneficial elements required for crop growth.In addition,the proportion of their main elements is uniform,which is conducive to the absorption and utilization of crops.Therefore,the imbalance of some nutrient elements will not be caused by a large increase in the application of organic fertilizer,which will destroy the soil nutrient balance and cause negative effects such as fertility decline.On the contrary,the more organic fertilizer is applied,the more balanced soil nutrient elements are,and the more beneficial it is for crops to absorb and use nutrients.
2.Promote the growth of soil microorganisms and the absorption and utilization of crops.Organic fertilizer contains a large amount of organic matter,which is the place where various microorganisms grow and breed.During the decomposition process of organic matter in organic fertilizer,it can also produce various phenols,vitamins,enzymes and auxin to promote the growth of crop roots and nutrient absorption.
3.Increase the replacement amount of soil and improve the fertilizer conservation capacity of crops.All organic fertilizers have strong cation substitution ability,and can absorb more potassium,ammonium,magnesium,zinc and other nutrients,which can prevent leaching and improve soil fertility,especially some humic acid organic fertilizers.In addition,organic fertilizer also has a strong buffering capacity,which can prevent the change of acidity caused by long-term application of fertilizer from affecting crop growth,improve the resistance of soil itself,ensure crop growth,and ensure good soil ecological environment.
4.Reduce nutrient fixation and improve nutrient utilization.Organic fertilizer contains a variety of organic acids,humic acids and other hydroxyl substances,which have strong chelating ability,and can chelate with a variety of metal elements to form a chelate to prevent soil from fixing these nutrient elements and losing efficacy.For example,if organic fertilizer is mixed with phosphorus fertilizer and organic fertilizer,organic acid and other chelates in organic fertilizer can chelate highly active aluminum ions in the soil,and prevent the combination of aluminum and phosphorus to form closed phosphorus that is difficult for crops to absorb,thus greatly improving the content of available phosphorus in the soil.
5.Accelerate the formation of soil aggregates and improve the physical properties of soil.After the organic fertilizer is applied to the soil,the organic colloidal substances in the decomposition process can combine with the inorganic colloidal substances in the soil.It forms organic-inorganic aggregates with different particle sizes.Organic and inorganic aggregates are important indicators of soil fertilizers.The more it contains,the better the physical properties of the soil,the stronger the ability to retain soil,water and fertilizer,the better the ventilation performance,and the more developed the crop roots.
6.Increase crop yield and improve the quality of agricultural products.Under the same nutrient elements,organic fertilizer is compared with chemical fertilizer.When used as base fertilizer,organic fertilizer is better than chemical fertilizer.When applied as topdressing,the effect of fully decomposed organic fertilizer is often better than that of chemical fertilizer.In particular,improving the quality of agricultural products is more beneficial than chemical fertilizers.Organic fertilizer contains a large amount of nutrients required by plants,and its nutrient supply to plants is relatively mild and long,with long aftereffect.Organic fertilizer also contains various trace elements.Because all kinds of nutrient elements in organic fertilizer are relatively complete,and these substances are completely non-toxic and harmless natural substances,which is a good method for high yield and provides the necessary conditions for green food.Organic fertilizer is decomposed into various humic acids in the soil.It can promote the enzyme activity,material synthesis,transportation and accumulation in plants.Humic acid is a kind of macromolecular material with high degree of cation substitution,good complexing and adsorption performance,and good complexing and adsorption effect on heavy metal ions,which can effectively reduce the toxicity of heavy metal ions to crops and prevent them from entering plants.This is beneficial to the production of pollution-free and hygienic green food.