Prevention of potassium deficiency in citrus
1. The symptoms of citrus potassium deficiency The tip of the old leaf and the upper part of the leaf margin turn yellow first, and gradually expands to a brownish to brownish scorch toward the lower part. The leaf edge curls upwards. The leaves are deformed and the tips of the leaves are withered; the top of the crown is weak, the new shoots are slender, and the leaves are relatively thin. Small; serious shortage of potassium in the flowering period is a large number of deciduous, branch shoots dead; fruit small skin smooth, juicy, less acid, perishable shedding; root growth is poor, the whole tree growth decline. 2. Causes of potassium deficiency in citrus Potassium in light sandy and acidic soils is easily lost and potassium deficiency occurs. In soils with low organic matter content, potassium content is low, and potassium deficiency is prone to occur. Too much lime is used in sandy soil and potassium can be reduced. Sex, induced potassium deficiency; excessive application of nitrogen, phosphorus, calcium, magnesium fertilizer, affect the absorption and utilization of potassium, are all likely to induce potassium deficiency disease; or in the mild potassium deficiency in soil application of nitrogen fertilizer, stimulate citrus growth, increase Potassium is more likely to show potassium deficiency. 3. Methods for correcting potassium deficiency in citrus Soil fertilization The annual application of potassium sulfate 300-500g, should be mixed with organic fertilizer application, the amount of potassium fertilizer should be applied, to avoid excessive application of other elements caused by deficiency. Foliar application of 0.3%-0.6% potassium dihydrogen phosphate, 0.5%-1% potassium nitrate. Spraying potassium sulfate during the hot season causes sunburn and should be used with caution. To prevent soil drought and dry season, the surface of shallow ploughing, the ground cover of rice straw, weeds, crop stalks, typhoon etc. to reduce the evaporation of soil moisture, timely irrigation, to prevent the soil from excessive drought. 4. Citrus potassium excess disease Symptoms: Because the general soil has a certain holding power for potassium, there is no high concentration of potassium in the soil solution. Therefore, there have been no reports of excessive potassium affecting growth and appearance of damage in rural conditions. However, under the conditions of hydroponics and sand culture, the symptoms of excessive potassium toxicity can still be seen. These symptoms include burns on the leaf margins, water-spotted lesions on the old leaves, and necrosis. The excessive accumulation of potassium in the soil affects the absorption of calcium, magnesium, manganese, and zinc by the plants and causes malnutrition of these elements. Ventilation is one of the most important components in a successful greenhouse. Greenhouse Circulation Fan,Greenhouse Ventilation Fan,Automated Greenhouse Ventilation Fan JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com
If there is no proper ventilation, greenhouses and their growing plants can become prone to problems. The main purposes of ventilation are to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent build-up of plant pathogens (such as Botrytis cinerea) that prefer still air conditions. Ventilation also ensures a supply of fresh air for photosynthesis and plant respiration, and may enable important pollinators to access the greenhouse crop.