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《The role of N,P,K》
Ⅰ.What do plants need for physiological growth?
Water, fertilizer, light, air and heat
Ⅱ.What are the functions of N, Pand K？
Nitrogen (N) can be used as a life element
(i) Nitrogen is an important component of protein (protein nitrogen accounts for 80%-85% of the total nitrogen in the plant, and protein contains 16%-18%) - a living substance
(ii) Nitrogen is a component of nucleic acids and nucleoproteins (nucleic acid nitrogen accounts for about 10% of the total nitrogen in the plant, and nucleic acids contain 15%-16%) - the material basis for synthesizing proteins and determining biological heredity
(iii) Nitrogen is a component of enzymes - a biological catalyst
(iv)Nitrogen is a component of chlorophyll (chloroplasts contain 45%-60% protein) - a place for photosynthesis
(v) Nitrogen is a component of multiple vitamins (such as vitamin B1, B2, B6, etc.) - a component of coenzymes
(vi) Nitrogen is a component of some plant hormones (such as IAA, CK) - a physiologically active substance
(vii) Nitrogen is also a component of alkaloids (such as nicotine, theophylline, theobromine, caffeine, choline - lecithin - biological membranes)
Phosphorus (P) can be used as an energy element
(i) Phosphorus constitutes the structural component of macromolecules
(ii) Phosphorus is a component of important compounds in plants
(iii) Phosphorus can enhance photosynthesis and the synthesis and operation of carbohydrates (Phosphorus participates in the material transformation of each stage of photosynthesis, participates in the operation of tri-carbon sugars in chloroplasts, and participates in the transportation of sucrose in sieve tubes)
(iv) Promote nitrogen metabolism (promote protein synthesis; facilitate the reduction and utilization of nitrate in the body; increase the nitrogen fixation of leguminous crops)
(v) Phosphorus participates in the synthesis of fats
(vi) Improve the adaptability of crops to the external environment (enhance the ability of crops to resist drought and cold; enhance the ability of crops to adapt to acid-base changes (buffering performance))
Potassium (K) can be used as a quality element
(i) Promote enzyme activation In organisms, potassium acts as an activator for more than 60 enzymes and promotes a variety of metabolic reactions.
(ii) Promote sugar metabolism
iii) Promote the transport of photosynthetic products - potassium can promote the transport of photosynthetic products to storage organs, allowing various tissues to grow and develop well
(iv) Promote nitrogen absorption and protein synthesis
(v) Promote plant economic water use
(vi) Promote the metabolism of organic acids
(vii) Enhance crop resistance - potassium has many aspects of stress resistance. It can enhance the ability of crops to resist drought, high temperature, cold, disease, salt, and lodging, thereby improving their tolerance to the harsh external environment. This has a significant effect on stable and high yields of crops.
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