1, type of nitrogen fertilizer

Nitrogen fertilizer can be divided into animal nitrogen fertilizer and plant nitrogen fertilizer. Animal nitrogen fertilizer, such as human manure, horse, cow, sheep, pig manure, fish manure, horseshoe, etc. And plant nitrogen fertilizer, such as bean cake, rapeseed cake, cottonseed cake, sesame residue, etc. , all belong to organic fertilizer; Inorganic fertilizers such as urea, ammonia, ammonium nitrate and ammonium sulfate are all available nitrogen fertilizers, which are generally used as topdressing outside the roots, but they are easy to cause soil hardening when used frequently.

2. Nitrogen fertilizer function

Nitrogen fertilizer can make trees flourish, increase chlorophyll and supplement nutrients for plant growth. Too much nitrogen fertilizer will lead to tissue softening, long stems and leaves, easy to be attacked by pests and diseases, and reduce the cold tolerance of plants; Too little nitrogen fertilizer will make the plant short, the leaves yellow and green, the growth is slow, and it can't bloom.

Second, phosphate fertilizer.

1, type of phosphate fertilizer

Bone meal, rice bran, fish scales and poultry manure are organic fertilizers containing more phosphorus, while calcium phosphate, phosphate rock powder and calcium magnesium phosphate are inorganic phosphate fertilizers.

2, the role of phosphate fertilizer

Phosphorus fertilizer can make the stems and branches of plants tough, promote the formation and flowering of flower buds, bear fruit early and improve the cold and drought resistance of plants. Plants lack phosphate fertilizer, grow slowly, have small leaves, and fruit matures late.

Third, potash fertilizer.

1, type of potash fertilizer

Plant ash is an organic potash fertilizer, which can be used as base fertilizer and topdressing. Potassium nitrate and potassium dihydrogen phosphate can be used for foliar spraying of potted plants.

2, the role of potash fertilizer

Potassium fertilizer can make the stems of plants strong, improve the ability of plants to resist diseases, insects, drought and lodging, develop their roots and improve fruit quality. Too much potassium fertilizer will shorten plant internodes, dwarf plants, turn leaves yellow, and seriously lead to death; Insufficient potassium fertilizer will cause necrotic spots on the leaf edge of plants, and then scorch and necrosis will occur.

Extended data:

Suggestions on Fertilization of Wheat

Apply diammonium phosphate 65438+ 7~ 10 kg per mu in phosphorus-deficient plots and nitrogen-potassium compound fertilizer 15~20 kg in potassium-deficient plots; Cover up after fertilization.

2. In order to prevent the later drought, the soil should be suppressed in time before it is thawed and turned green, and the garbage should be decomposed to make the soil sink and improve and maintain the moisture. Repression should be combined with ploughing and hoeing, first pressing and then hoeing. Before the wheat harvest period, cover wheat or corn stalks between rows per mu to reduce the evaporation loss of soil water.

3. If the growth was vigorous and the total number of stems was above 800,000 years ago, due to the large wheat population and serious nutrient consumption, the wheat seedlings turned yellow or the leaf mats turned yellow in spring, and the topdressing can be divided into 2-3 times from the greening to the jointing stage, and the topdressing of high-nitrogen compound fertilizer per mu 10kg/ time.

Reference: 20 17 Guidelines for Scientific Fertilization of Main Crops in Spring-Xinhuanet