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 frequently affected by phosphorus and potassium deficiencies due to improper fertilization timing. These nutrient imbalances can lead to weak, unhealthy plants, resulting in deformed fruits, reduced yields, and poor quality. To ensure high-quality and high-yield tomatoes, it is essential to apply fertilizers at the right times throughout the entire growth cycle—during planting, vigorous growth, and fruiting stages.
First, apply base fertilizer during the planting phase. Before transplanting tomato seedlings, you can add 1,000 kg of farmyard manure, 10 kg of urea, 10 kg of ammonium phosphate, and 40–50 kg of superphosphate per mu. Alternatively, use 1,000 kg of high-quality organic compost along with 25–50 kg of a triple compound fertilizer containing nitrogen, phosphorus, and potassium, plus 10 kg of urea. This provides a solid foundation for healthy plant development.
Second, apply foliar fertilizers during the active growth stage. When the seedlings have 5–6 leaves and the leaves appear lighter in color, foliar sprays can be used. Common options include 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. Apply each type once every 10 days during the flowering and fruit set period. These sprays can also be combined with pest and disease control measures to maximize efficiency.
Third, perform timely top-dressing during the fruiting stage. When the first tomato fruit reaches a diameter of 1.5–2.5 cm, apply additional fertilizer and water. A typical application includes 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. Water the soil after applying the fertilizer. When the second and third fruits reach 3 cm in diameter, apply a second and third round of fertilization, 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 watering. Spraying with potassium dihydrogen phosphate, gexin liquid, or superphosphate helps improve fruit color and overall quality.