Tomatoes are high potassium crops that are sensitive to potash. When the potassium is lacking, the middle and lower leaves of the tomato become yellowish-brown, and when it is severe, the lower leaves die, affecting the young fruit development, reducing the fruit quality, and may also cause physiology and diseases such as rot and rot. In recent years, potassium deficiency has been relatively common. The main reason is that organic fertilizers are used in small quantities and potassium fertilizer is not paid attention. The amount of water in vegetable fields is large, and the loss of potassium is serious. In addition, the amount of potassium required by tomatoes is large, which makes it easy to show potassium deficiency.
Potassium fertilizer application to tomato can promote seedling growth robust, rapid development, developed roots, early flowering, early fruiting, early maturation. Under the same conditions of nitrogen and phosphate fertilizers, the tomato with potassium fertilizer can be harvested earlier than a week, and can improve the cold resistance, drought resistance, and disease resistance of the tomato, and increase the yield by more than 20%. Under the same premise of other fertilizers, the application of 15 kg of potassium sulfate per acre was 250-350 kg more than that of the autumn tomato without potassium fertilizer, the content of vitamin C was increased by 13.2%, and the sugar content was increased by 13.7%. At the same time, the appearance is bright, the color is good, and the maturity is the same. The pulp at the base of the fruit has no crack and no deformity, thus increasing the value of the product.
Potash fertilizer can be used as base fertilizer or seed fertilizer, application, acupoint application or early topdressing. Generally, 10-20 kg potassium sulfate is applied per mu. Potassium fertilizer in vegetable fields with adequate organic fertilizer can be appropriately reduced, and vice versa. It is better to spray with potassium dihydrogen phosphate and trace elements in the middle and later stages of tomato growth.
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