The role of nitrogen, phosphorus and potassium fertilizers

Nitrogen Fertilizer

Types of nitrogen fertilizer

Nitrogen fertilizers can be divided into animal nitrogen fertilizers and plant nitrogen fertilizers. Animal nitrogen fertilizers include human excrement, horse, cattle, sheep, pig feces, fish fertilizer, horseshoes, etc., and plant nitrogen fertilizers include bean cake, rapeseed cake, cottonseed cake, sesame residue, etc., both of which are organic fertilizers; inorganic fertilizers such as urea, ammonia water, ammonium nitrate, ammonium sulfate, etc. are all fast-acting nitrogen fertilizers, generally used as foliar fertilizers, but frequent use can easily cause soil compaction.

Effect of nitrogen fertilizer

Nitrogen fertilizer can promote the growth of trees, increase chlorophyll, and supplement nutrients for plant growth. Too much nitrogen fertilizer will cause the plant tissue to become soft, the stems and leaves to grow too long, making it susceptible to disease and insect attacks, and reducing the plant's ability to withstand cold; too little nitrogen fertilizer will cause the plant to be short, the leaves to be yellow-green, the growth to be slow, and the plant to fail to bloom.

Phosphate Fertilizer

Types of Phosphate Fertilizers

Bone meal, rice bran, fish scales, and poultry manure are organic fertilizers with high phosphorus content, while calcium phosphate, rock phosphate, and calcium-magnesium phosphate fertilizer are inorganic phosphorus fertilizers.

Effect of Phosphate Fertilizer

Phosphorus fertilizer can make plant stems and branches tough, promote the formation of flower buds and flowering, early ripening of fruits, and improve the plant's ability to resist cold and drought. When plants lack phosphorus fertilizer, they grow slowly, have small leaves, flowers and fruits, and the fruits mature late.

Potash Fertilizer

Potash fertilizer types

Wood ash is a type of organic potassium fertilizer and can be used as base fertilizer and topdressing; potassium nitrate and potassium dihydrogen phosphate can both be used for foliar spraying of potted plants.

Potassium fertilizer effect

Potassium fertilizer can make the stems of plants strong, improve the plants' resistance to disease, insects, drought and lodging, develop their root systems and improve the quality of their fruits. Too much potassium fertilizer will shorten the internodes of the plant, dwarf the plant, turn the leaves yellow, and in severe cases, cause death; lack of potassium fertilizer will cause necrotic spots to appear on the leaf edges of the plant, followed by scorch and necrosis.