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 when 11 to 12 leaves are present. 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.
Our Dental Chair Products is good in quality and competitive in price. We are manufacturer and supplier Dental Chair Products following your specific requirement. We are looking forward to your E-mail and establishing cooperative relationship with you! We would provide professional Laboratory Tester with good services for you!
Dental Chair
Dental Chair,Belmont Dental Chair,Dinosaur Dental Chair,Used Dental Chairs,Best Dental Chair
Ningbo Cland Medical Instruments Co., Ltd. , https://www.cland-med.com