ZHONGSHAN G.H.L. TRADING CO., LTD. , https://www.ghltrade.com
The best fertilization period for tomato high yield
Tomatoes, whether grown in open fields or under protected conditions, are often affected by phosphorus and potassium deficiencies due to improper timing of fertilization. These nutrient imbalances can lead to weak plants, deformed fruits, and a range of other symptoms that ultimately result in lower yields, poor quality, and reduced efficiency. To ensure high-quality and high-yield tomatoes, it's essential to apply fertilizers at the right times throughout the entire growth cycle—specifically during planting, vigorous growth, and fruiting stages.
First, applying base fertilizer during the planting phase is crucial. Before transplanting tomato seedlings, you can use 1,000 kg of farmyard manure combined with 10 kg of urea, 10 kg of ammonium phosphate, and 40–50 kg of superphosphate per mu. Alternatively, you can use 1,000 kg of high-quality compost along with 25–50 kg of a triple compound fertilizer containing nitrogen, phosphorus, and potassium, plus 10 kg of urea. This helps provide a strong foundation for healthy plant development.
Second, during the vigorous growth stage, foliar spraying can be an effective way to supplement nutrients. When the seedlings have 5–6 leaves and the leaves start to appear lighter in color, you can spray them with solutions such as a 300-times diluted urea solution, a 300-times diluted potassium dihydrogen phosphate solution, a 500-times diluted gexin liquid fertilizer, or a 0.1–0.3% potassium sulfate compound fertilizer solution. Each type of fertilizer should be applied once every 10 days during the flowering and fruit-setting period. This practice can also be combined with pest and disease control to maximize efficiency.
Third, timely topdressing during the fruiting stage is essential. When the first fruit reaches a diameter of 1.5–2.5 cm, apply additional fertilizer and water. A typical recommendation is 15–20 kg of ammonium nitrate and 20–30 kg of superphosphate per mu, or 5 kg of urea and 10–20 kg of potassium sulfate compound fertilizer. After application, water the soil thoroughly. When the second and third fruits reach about 3 cm in diameter, perform the second and third topdressings, using 10 kg of urea and 15–20 kg of potassium sulfate compound fertilizer per mu. The same method applies as the first time. During the full fruiting stage, foliar sprays can also be used alongside regular spraying. Fertilizers like potassium dihydrogen phosphate, gexin liquid, and superphosphate can help improve fruit color and overall quality.