Tomato commonly known as tomato, it is the need for more fertilizer, fertilizer resistance of solanaceous vegetables. It needs the most nitrogen, phosphorus and potassium, followed by nitrogen and phosphorus. About 2.7 kg of hydrogen, 0.7 kg of phosphorus and 5 kg of potash are needed for every 1000 kg of tomato production. The ratio of N, P and K in the whole tomato plant was 1:0.4.2, and the absorption of N and K in tomato was 40%-50% of the fertilizer application amount, and the absorption of P was only about 20% of the fertilizer application amount, which was twice the difference with hydrogen and K. Therefore, the ratio of tomato hydrogen, phosphorus and potassium fertilizer should be 1:1:2. Compared with hydrogen fertilizer alone, increasing phosphorus and potassium fertilizer had obvious effect on yield increase.

Nutritional characteristics of tomato:

1, tomato life is divided into: germination period, seedling period, flowering and fruiting period. The nutrient uptake in the early stage is very small, and the nutrient uptake in the full fruit stage can account for 70%~80% of the total.

2, tomato nitrogen, will cause plant emaciated, leaf color hair light, light green or yellow. The leaves are small and thin, the veins turn from yellowish green to dark purple, the main stem becomes hard and dark purple, the ears are few, and the plants are easy to be infected with gray mold and blight.

3. Phosphorus deficiency at seedling stage, the abaxial surface of leaves is lavender, and the veins initially appear some small spots of light purple, and then expand. The main stem is slender, the stem becomes red, the leaf is narrow and small, the later stage appears curly, the fruiting is late, the fruit is small.

4, potassium deficiency, young leaves curled, old leaves initially gray green, then yellow green margin, until dry. Sometimes veins lose green and necrotic, or even expand to new leaves. Falling fruit, cracking fruit, late ripening. Poor fruit quality.

5, calcium deficiency, upper leaf chlorosis yellow, leaf margin heavier, gradually become brown necrosis. Young leaves are small, deformed and constricted, easy to turn purple brown and die. Fruit top rot, in the fruit of the top of the round rot patch, showing water stains, black brown, called umbilical rot.

6, magnesium deficiency, lower leaves lose green, veins and veins nearby to maintain green, the formation of yellow-green spot leaves, serious leaves some rigid, leaf edge volume, leaf edge macula banded, and necrosis points. Old leaves die and the whole leaves turn yellow.

7, iron deficiency, the base of the leaf first yellow flowers, golden yellow, and to the tip of the leaf development, leaf leading edge can be seen residual green, petiole purple.

8, lack of boron, young leaf tip yellow flowers, leaf deformation. When serious, less fruit set, fruit wrinkling, lignification spots appear, ripening inconsistent.

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