When the first month is spring, the crop growth begins to recover. The seedlings grow, the old trees recover, and they don't leave the nutrient supply. At this time, farmers are accustomed to supplement nutrients with compound fertilizer, ignoring the supplement of trace elements. However, the recovery of crops, the development of roots requires NPK and calcium is also indispensable. Therefore, spring supplementation of calcium in crops is very important.
First, the cause of calcium deficiency
1. Physiological calcium deficiency. Physiological calcium deficiency means that the soil itself contains enough calcium, which affects transpiration or root growth, which causes calcium to be absorbed by crops. These factors include temperature, soil pH, and soil moisture. When the pH value is less than 6, the utilization rate of calcium is drastically lowered, so the acidic soil generally has a severe calcium deficiency.
2. The soil contains low calcium or high salt content, which affects the absorption of calcium by roots.
3. Excessive application of nitrogen fertilizer. Because the excessive use of nitrogen fertilizer will increase the salt concentration of the deep fluid in the soil and reduce the absorption of calcium.
Second, calcium deficiency performance
1. The transportation of calcium nutrients by crops is mainly carried out in the xylem from the roots to various parts of the plant through the form of transpiration and root pressure. When the crop is deficient in calcium, there will be problems such as soft head and top bud necrosis, young leaves curl deformity, leaf edge scorch, and fruit cracking.
2. The calcium-deficient parts are top buds, lateral buds, new leaves and fruits. On the one hand, because the transpiration of these parts is very weak, the transpiration of crop organs from old to small is the old leaf-new leaf-fruit-top bud. Once calcium deficiency occurs, the calcium deficiency problem first occurs in addition to the old leaves. On the other hand, the transfer rate of calcium in plants is very slow. Once calcium deficiency occurs, although a large amount of calcium is stored in the old leaves, it cannot be transferred in time. Therefore, the calcium deficiency is first expressed in the young leaves and the old leaves are not too obvious. .
Third, the solution
1. Improve soil structure. By regulating the acid-base balance of the soil, the soil aggregate structure is improved, the soil is adjusted to a suitable range, and the root growth is promoted to promote calcium absorption.
2, apply calcium supplementation. Commonly used calcium fertilizers on the market include lime and calcium nitrate. However, caution should be exercised. For example, long-term application of lime may cause the pH of the soil to rise and should not be used for years.
3, leaf surface calcium. The combination of roots and leaves, the roots are mainly supplemented, and the foliage is supplemented. At the same time as the base fertilizer is applied, the chelated calcium fertilizer is sprayed on the foliage before the critical period and maximum period of the demand for calcium in the crop.
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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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