How to do well the three-stage topdressing of tomato due to lack of fertilizer and easy deformity

Whether in open field or protected field, tomato is often deficient in phosphorus and potassium due to the wrong time of fertilization, resulting in plant weakness, abnormal fruit and other symptoms, resulting in low yield, poor quality and poor efficiency. Therefore, in the whole growing period of tomato, according to the growth characteristics of tomato, timely fertilization should be applied in planting stage, strong seedling stage and fruiting stage to ensure high quality and high yield of tomato.

Tomato fertilization

Applying sufficient base fertilizer during the planting period: before transplanting tomato seedlings, high quality farm manure 1000kg, urea 10kg, ammonium phosphate 10kg, calcium superphosphate 40-50kg per mu, or 1000kg high quality soil miscellaneous fertilizer, 25-50kg potassium sulfate ternary compound fertilizer and urea 10 kg could be applied.

Fertilization in the strong seedling stage: when tomato seedlings grow to 5-6 leaves, if the color of the leaves becomes lighter, fertilizer can be sprayed on the leaves. Commonly used fertilizers: 300 times urea solution, 300 times potassium dihydrogen phosphate solution, 500 times Hexin liquid fertilizer, 0.1-0.3% potassium sulfate compound fertilizer solution, in the strong seedling stage, about 10 days, sprayed once. Foliar fertilizer spraying can be combined with pest control.

Topdressing at the right time in the fruiting period: topdressing and watering the tomato when the diameter of the first fruit was 1.5-2.5cm, generally using 15-20kg ammonium nitrate and calcium superphosphate 20-30kg per mu, or urea 5kg, 10-20kg potassium sulfate compound fertilizer, sprinkled on the ground and applied with water. When the diameter of the second and third fruit was up to 3cm, the second and third times of fertilization and watering were carried out. 10kg urea and 15-20kg potassium sulfate compound fertilizer were used per mu of tomato, and the fertilization method was the same as that of the first time. In the full fruit stage, combined with spraying, foliar fertilizer can be sprayed, and potassium dihydrogen phosphate, Hexin liquid fertilizer, calcium superphosphate and other fertilizers can be sprayed, which is beneficial to the coloring and quality of tomato.