As if there are two kinds of nitrogen, phosphorus and potassium, hoping to get answers and explain their respective roles
According to the study, three essential conditions for determining the essential nutrient elements of the plant are: (1) This element is essential for the vegetative growth and reproductive growth of the plant. When it is completely absent, the plant can not complete its life cycle; The need for such elements is specific, other elements can not replace its role, the lack of plants will be a special lack of symptoms, only to meet this element, the symptoms will be eliminated; ⑧ this element must be in the plant from the body Direct effect, not just to improve the plant growth environment indirect role.
Only 70 kinds of chemical elements can be detected in plants, but only 16 kinds of essential nutrient elements are needed for the growth and development of internationally recognized higher plants. They are carbon (C), hydrogen (H), oxygen (O), nitrogen (Fe), magnesium (Mg), sulfur (S), iron (Fe), boron (B), manganese (Mn), copper (Cu), zinc (Zn), molybdenum (Mo) and chlorine (C1), which can be divided into large nutrient elements, medium nutrient elements and micronutrient elements according to their requirements, such as carbon, hydrogen, oxygen and nitrogen Phosphorus, potassium, copper, zinc, molybdenum and chlorine.Now there are scholars that nickel (Ni) is the first 17 kinds of essential nutrients.
(N) Nutrition: Nitrogen is necessary for the growth and development of plants. Usually, the total amount of nitrogen in plants is not too high, such as 1.0-2.0% of the whole plant. The plant is a plant with high nitrogen content, and the nitrogen content in the plant leaves is about 3.5-5.0% of its dry weight.The nitrogen is mainly absorbed in the form of ammonium nitrogen and nitrate nitrogen, and some small molecules of organic nitrogen Such as urea can also be absorbed by plants.Now is the main component of protein, accounting for about 16-18% of the protein content in the cytoplasm and the nucleus are containing all the enzymes are also the main body of the protein.In addition, the nucleic acid, Phospholipids, chlorophyll, coenzyme and other compounds contain nitrogen
