First, iron deficiency: The absolute content of soil iron is low, or more fertilizer, more potassium, more ammonia, more calcium, but also easily lead to iron deficiency; cultivation temperature is too low, so that the absorption of iron by plants is hindered.
The second is the lack of oxygen: the soil or nutrient solution lacks oxygen, nitric acid is oxidized to nitrous acid, or the soil is seriously acidified, and the conversion from nitrous acid to nitric acid is stopped. Poisoning caused by nitrous acid accumulation also causes yellowing of the top tender leaves.
The third is the residual herbicide damage; if the previous use of simazine herbicide, the top of the tender leaves will be yellow.
The fourth is the damage caused by plastic nutrients: Some manufacturers use plastic raw materials to produce non-standard raw materials, and the messy recycled materials are mixed with harmful chemical components, which may lead to yellowing of the top leaves.
Vitamins are a type of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. In terms of physiological functions, vitamins are neither a raw material for tissues nor a substance for supplying energy, but they are an indispensable substance for the body. It has many types and different chemical structures. Most of them are the components of the coenzyme (or prosthetic group) of certain enzymes. They are the indispensable compounds for maintaining the normal growth (growth, health, reproduction and production function) of the body. It plays a catalytic role in the body to promote the synthesis and degradation of major nutrients (proteins, fats, carbohydrates, etc.), thereby controlling metabolism. Vitamins are essentially low-molecular organic compounds. They cannot be synthesized in the body, or the amount synthesized is difficult to meet the needs of the body, so they must be supplied from the outside. The daily requirement of vitamins is very small (usually measured in milligrams or micrograms). They are neither a raw material for body tissues nor a substance for energy supply in the body. However, they do not regulate material metabolism, promote growth and development, and maintain physiological functions.
Vitamin K2 MK-7, Vitamin C, Vitamin E, Vitamin K2, Vitamin H, Vitamin D3
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