(1) nitrogen is an important component of protein and nucleic acid: the content of nitrogen in protein accounts for 16% ~ 18%, so it can be said that without nitrogen, there would be no protein, and protein is the main material basis of biological life. Without nitrogen, the metabolism in flowers cannot be carried out. Nucleic acid is also a nitrogenous substance, which is often combined with protein, and is called nucleoprotein. It is the transmitter of genetic information and the foundation of life.
(2) Nitrogen is an important component of chlorophyll: in the leaves of higher plants, chloroplasts account for 20% ~ 30% of the dry weight of leaves, and the dry matter of chloroplasts contains 45% ~ 60% of protein. Flowers rely on chlorophyll for photosynthesis, and the amount of chlorophyll directly affects the products of photosynthesis. When nitrogen supply is insufficient, chlorophyll will decrease and leaves will be yellow-green, which will affect photosynthesis and reduce carbohydrate production.
(3) Nitrogen is an important component of enzymes in flowers. Enzymes are catalysts for the metabolism of substances in flowers, which directly affect the direction and speed of biochemical reactions in flowers.
Nitrogen plays an important role in the life activities of flowers and is called "life element". When nitrogen supply is sufficient, flowers grow vigorously, plants are tall, with many branches, large leaves and many flowers and fruits. When nitrogen supply is insufficient, the plants are thin, the leaf deformation is small, the leaf color is yellow and it is easy to fall off. However, it is not appropriate to apply too much nitrogen fertilizer, otherwise it will easily lead to white growth of branches and leaves and affect flowering and fruiting.