(1) Nutritional effects of zinc fertilizer
1. Distribution of zinc in crops
The normal zinc content of crops is 25-150mg/kg, which varies according to crop types and varieties. The zinc in the plants is distributed in the shoot tips and young leaves.
2. The role of zinc in crop growth and development
Some enzyme components or activators; participate in the metabolism of auxin; participate in the formation of carbohydrates; promote protein metabolism; promote reproductive organ development and improve stress resistance; improve crop drought resistance, heat resistance, low temperature resistance and resistance The ability of frost.
3. Nutritional imbalance of zinc fertilizer
Zinc deficiency, crop growth and development is inhibited, plant type is short, leaves are small, deformed, chlorotic or yellowing between veins; fruit branches at the top branches or side branches are shortened, into rosettes, new leaves are small, and clumped; such as apples "lobular disease", "lens branch" or "cluster disease"; "white seedling disease" of corn, rice, etc.
(2) Nutritional effects of boron fertilizer
1. Distribution of boron in crops
The boron content in the crop is 2-100 mg/kg. Generally, dicotyledonous crops require more boron than monocotyledonous crops. The reproductive organs are higher than the vegetative organs; the leaves are higher than the branches, and the branches are higher than the roots. Boron does not move in the crop body, and is concentrated in organs such as ovary and stigma.
2. The role of boron in crop growth and development
Promote the transport and metabolism of carbohydrates in the body; promote cell elongation and cell division; promote the establishment and development of reproductive organs; improve the nitrogen fixation ability of leguminous crop rhizobium.
3. Nutritional imbalance of boron fertilizer
Boron deficiency, when boron is insufficient, a large amount of carbohydrates accumulate in the leaves, making the old leaves thicker, brittle, and deformed; the growth of the top of the plant is stagnant, and the growth point is withered and even died in severe cases; the elongation of the main root and lateral roots is inhibited, Even stop growing, so that the root system is short and thick, both brown; reproductive organ development is blocked, pollen grain development is not normal, resulting in rape "flowers are not real", cotton "buds and flowers", wheat "spots are not real"; Boron deficiency also causes crops to develop symptoms such as beet "corrosion" and cauliflower "chole heart disease".
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