Tomatoes are heavy feeders and respond well to proper fertilization. To produce around 6,600 pounds of tomatoes per acre, the plants need to absorb approximately 18.6 pounds of nitrogen, 8.6 pounds of phosphorus, and 24.6 pounds of potassium from the soil. The ideal ratio of these three nutrients is roughly 1:0.46:1.32. This balance plays a crucial role in ensuring healthy growth and high yield.
During the seedling stage, tomatoes require more nitrogen to support early development. As the first fruits begin to set, the uptake of nitrogen, phosphorus, and potassium increases rapidly. At this point, nitrogen makes up about 50% of the total nutrient demand, while potassium accounts for only 32%. However, as the plant progresses into the fruiting stage, the need for potassium rises significantly. By the time harvesting begins, nitrogen usage drops to about 36%, while potassium takes up nearly 50% of the total. In fact, over 70% of the potassium required by the plant is absorbed during the fruit enlargement phase. Later in the season, potassium uptake slightly decreases, and phosphorus becomes less critical, making up around 15% of the total nutrient intake.
Excessive nitrogen during the growing season can lead to several problems. It may cause the plants to become overly lush, reducing flowering and fruit set. Moreover, too much nitrogen can interfere with calcium absorption, leading to issues like blossom end rot and other physiological disorders. Therefore, it's important to manage fertilizer application carefully throughout the growing cycle.
When planting tomatoes, especially in autumn-winter or winter seasons, it's recommended to apply organic fertilizer along with plowing. A special vegetable fertilizer such as "Hongjie" should be applied at a rate of 70-100 kg per mu before planting. Once the first fruits appear, top-dressing should begin. After each fruit set, apply another dose of "Hongjie" vegetable fertilizer at 20-35 kg per mu, combined with irrigation. This approach ensures a steady supply of essential nutrients and supports optimal plant growth and fruit development.
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