What is the function of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer?

What is the function of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer? What are the varieties of nitrogen fertilizer, phosphate fertilizer and potash fertilizer? There are no netizens who know about it to help introduce that nitrogen fertilizer, phosphate fertilizer and potash fertilizer are indispensable elements in agricultural planting, so the farming network has sorted out the main functions and common varieties of nitrogen fertilizer, phosphate fertilizer and potash fertilizer, which are listed in detail below for netizens' reference. The role of nitrogen fertilizer: nitrogen fertilizer is the fertilizer for nitrogen nutrients needed for plant growth, and it is an important substance that makes up plant protein. Plant chlorophyll, phospholipids, sugars, nucleic acids, vitamins and alkaloids all contain nitrogen. Nitrogen fertilizer can also help crops divide and grow. The application of nitrogen fertilizer can not only increase the yield of agricultural products, but also improve the quality of agricultural products. The performance of crop nitrogen deficiency: crop nitrogen deficiency showed that the lower old leaves of the plant began to fade from the leaf tip and then gradually extended to the upper leaves. The leaves of nitrogen-deficient plants are grayish green or yellow, narrow and small, with slow emergence of new leaves and a small number of leaves. In severe cases, the old leaves in the lower part of the plant are yellow, withered and die. Nitrogen-deficient plants have short, slender stems, more woody stems and fewer tillers. When crops are nitrogen deficient, flowers and fruits grow slowly, grains are not full, flowers and fruits fall seriously, abnormal premature senescence, early maturity, small seeds and low yield. The performance of excessive nitrogen in crops: excessive application of nitrogen fertilizer will delay the growth period of crops, green and late maturity; crops with short growth period will prolong the growth period and are vulnerable to early frost. Too much nitrogen fertilizer will make crops grow too much, the cell wall is thin, the leaf area increases, the leaf color is thick green, the cells are succulent, the plant is soft, and it is vulnerable to mechanical injury and cause fungal diseases. Excessive application of nitrogen fertilizer has high population density, poor ventilation and light transmission, which can easily lead to premature senescence of middle and lower leaves, poor resistance, lodging and decrease of seed setting rate. Types of nitrogen fertilizer: first, ammonium too nitrogenous fertilizer: common are ammonium sulfate, ammonium chloride, ammonium bicarbonate, ammonia and liquid ammonia. Second, nitrazide fertilizer: common are sodium nitrate, calcium nitrate. Third, amide nitrogen fertilizer: the common ones are urea, calcium cyanide (lime nitrogen). The function of phosphate fertilizer: the main function of phosphate fertilizer is to accelerate the growth of crop roots, promote the absorption of water and nutrients, improve the water use efficiency of crops and the ability to survive the short drought period; phosphorus can promote flower bud differentiation, flowering and fruiting of melons, eggplant vegetables and fruit trees, and improve crop fruiting rate. Phosphorus can also increase the stress resistance of crops, improve cold resistance, drought resistance, saline-alkali resistance and disease resistance; phosphorus can also promote the root growth of legume crops, shorten the time needed for root nodule development and activation, and increase the number of root nodules. The performance of crop phosphorus deficiency: first of all, the plant starts from the lower leaves, the leaf margin gradually turns yellow, and then dies and falls off; crop phosphorus deficiency is also manifested by few flowers, few fruits, late ripening fruits, small and not full seeds. The performance of excessive phosphorus in crops: excessive supply of phosphorus will make crop leaves thick and dense, leaf color thick green; crop reproductive organs develop prematurely, so stem and leaf growth is inhibited, resulting in premature senescence; leafy vegetables increase cellulose content and reduce edible quality. and poor uniformity; fruits are poorly colored. Types of phosphate fertilizer: first, water-soluble phosphate fertilizer: common are calcium superphosphate, heavy superphosphate and ammonium phosphate (monoammonium phosphate, diammonium phosphate). Second, wolfberry soluble phosphate fertilizer: the common ones are calcium magnesium phosphate fertilizer, defluorinated phosphate fertilizer and calcium hydrogen phosphate. Third, insoluble phosphate fertilizer: common bone powder and phosphate rock powder. The role of potash fertilizer: potash fertilizer is a fertilizer for potassium nutrients needed for plant growth. Proper application of potash fertilizer can make grain grains full, promote tuber roots such as potatoes and potatoes to increase, while fruits, sugarcane and sugar beets can increase sugar content. increase the tillering of rice, wheat and other gramineous crops. And can make plant stems and roots stout, not easy to lodge, enhance drought resistance, cold resistance, disease resistance. The performance of crop potassium deficiency: crop potassium deficiency generally appears in the middle and later stage of growth and development, showing slow growth and dwarfing of plants; when potassium deficiency is serious, the edges of crop leaves wither and turn brown, the stem is small and weak, it is easy to lodge, there are more tillers and less ears, the seeds are thin and small, the pulp is not full, and the fruit is deformed. Common types of potash fertilizer are: potassium chloride, potassium sulfate, potassium carbonate, potassium magnesium fertilizer, potassium magnesium sulfate fertilizer, plant ash. How to use urea? is it good for granulated urea?