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 can easily make the soil acidified and calcium deficiency. Excessive fertilization, especially nitrogen and potassium fertilizers, will affect the normal absorption of calcium by celery roots. In addition, adverse environmental conditions such as low temperature, high temperature and drought will reduce root activity and weaken the ability of roots 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. To avoid high temperature and drought, the temperature is too high to ventilate and reduce the temperature, keep the soil moist, water pouring, can not suddenly dry. When “heartburn†occurs, it is necessary to spray 0.5% calcium chloride or calcium nitrate aqueous solution to the foliage in time, or to spray calcium fertilizer such as Green Fenway No.3.
Antibiotic refers to a class of secondary metabolites produced by microorganisms (including bacteria, fungi, actinomycetes) or higher animals and plants that have anti-pathogens or other activities in the life process and can interfere with the development of other living cells. Chemical material. Antibiotics commonly used in clinic are extracts from microbial culture fluids and chemically synthesized or semi-synthetic compounds. [1]
The antibacterial or bactericidal effect of antibiotics and other antibacterial agents is mainly aimed at killing the mechanism of "there is bacteria but not by humans (or other animals and plants)". It contains four major mechanisms of action, namely: inhibiting bacterial cell wall synthesis and enhancing bacterial cell membrane permeability Sex, interfere with bacterial protein synthesis and inhibit bacterial nucleic acid replication and transcription.
Antibiotics
GMP Azithromycine USP42,CAS NO.83905-01-5 USP42,Azithromycine Powder CAS NO.83905-01-5
Shijiazhuang Dingmin pharmaceutical Sciences Co.,Ltd , https://www.dingminpharma.com