1. Symptoms: At the beginning, the veins of the leaves of the celery leaf turn brown, and the cells of the leaf margin gradually die out, showing a dark brown color. The pre-birth period is less frequent and generally occurs mainly when 11-12 leaves.
2. Cause of the disease: mainly caused by calcium deficiency. A large number of chemical fertilizers tend to make the soil acidified and calcium deficiency. Excessive fertilization, especially nitrogen fertilizer and potassium fertilizer, will affect the normal absorption of calcium in celery roots. In addition, adverse environmental conditions such as low temperature, high temperature, and drought all reduce root activity and weaken the ability of the root to absorb calcium.
3. Control methods: Choose neutral soil to grow celery, apply appropriate amount of lime to the acidic soil, and adjust the acidity and alkalinity of the soil to neutrality. Apply more organic fertilizer to avoid excessive application of nitrogen and potassium fertilizers, especially not to apply large amounts of available nitrogen fertilizers at one time. Avoid high temperature and drought. If the temperature is too high, it is necessary to ventilate and cool down, keep the soil moist, and dilute with water. Do not dry or damp. When a "heartburn" occurs, the 0.5% calcium chloride or calcium nitrate aqueous solution shall be sprayed on the leaves in time, and calcium fertilizer such as Green Fenway No. 3 may also be sprayed.
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
Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualyn-bio.com