Nitrogen is the main component of protein, which plays an important role in the growth of stems and leaves and the development of fruits, and is the nutrient element most closely related to yield. Nitrogen or some plant hormones such as auxin and cytokinin, vitamins such as B 1, B2, B6,? Components such as PP play an important role in regulating life activities.
Phosphorus fertilizer can promote tomato flower bud differentiation, early flowering and fruiting, promote seedling root growth and improve fruit quality. When phosphorus is deficient, buds and roots grow slowly, plants are short, leaves are dark green and dull, and the back is purple.
Potassium can promote the health of plant stems, improve fruit quality, enhance the cold resistance of plants, and increase the contents of sugar and vitamin C in fruits.