First, apply the base fertilizer during the planting period. Before the transplanting of tomato seedlings, 1,000 kg of farmyard manure, 10 kg of urea, 10 kg of ammonium phosphate and 40-50 kg of superphosphate can be applied per mu, or 1,000 kg of high-quality soil fertilizer and potassium sulfate ternary compound fertilizer 25- 50 kg, 10 kg of urea. Second, fertilization in the flood season. When the tomato seedlings grow to 5-6 leaves, if the leaf color becomes lighter, foliar spray can be performed. Commonly used fertilizers include 300 times urea solution, 300 times potassium dihydrogen phosphate solution, 500 times gexin liquid fertilizer, and 0.1-0.3% potassium sulfate compound fertilizer solution. Each fertilizer is sprayed once every 10 days during the strong pod stage. Spraying fertilizers can be combined with the control of pests and diseases at this stage. Third, the results of timely fertilizer. When the diameter of the first fruit of the tomato grows to 1.5-2.5 cm, topdressing and watering, usually 15-20 kg of ammonium nitrate per mu, 20-30 kg of superphosphate; or 5 kg of urea, potassium sulfate compound fertilizer 10- 20 kg. After the ground is applied, water is applied. When the diameters of the second and third fruits are as long as 3 cm, the second and third fertilizations are performed respectively. Each mus of urea can use 10 kg of urea and 15-20 kg of potassium sulfate compound fertilizer. The fertilization method is the same for the first time. In the full fruit period, spraying fertilizer can be used in combination with spray spraying, and potassium dihydrogen phosphate, glutinous liquid fertilizer and superphosphate can be sprayed, which is beneficial to the coloration and quality improvement of fruits.
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No matter whether the tomatoes are cultivated in open or protected areas, phosphorus deficiency and potassium deficiency are often caused by improper fertilization time, resulting in debilitating plants, resulting in deformities and other symptoms, resulting in low yield, poor quality, and poor efficiency. Therefore, in the whole growth period of tomato, according to its growth characteristics, timely fertilization should be carried out during the planting period, the vigorous growth period and the result period to ensure high quality and high yield of tomatoes.