After planting from tomato to flowering, the plant growth is small, the demand for nitrogen fertilizer is small, and the nitrogen fertilizer applied in the soil can fully meet the growth requirements, so it is not necessary to apply nitrogen fertilizer during this period.
After the tomato enters the flowering result period, as the temperature rises, the growth rate of the plant increases, and the growth amount increases rapidly. At this time, the nitrogen fertilizer should be applied to ensure the nutrient supply of the tomato. When the first spike flower is opened, 20-25 kg of nitrogen fertilizer can be applied per acre, and potassium fertilizer is applied at the same time to promote the normal growth of the tomato. During the period from the first ear of the tomato to the fruiting of the fourth ear, the temperature is gradually increased, the transpiration is increased, and the interval of watering is gradually shortened. Therefore, the nitrogen fertilizer should not be excessively applied every time to avoid the loss of nitrogen fertilizer with water. The amount of each application should be determined based on the total amount of fertilizer applied and the number of waterings.
After the tomato enters the picking period, the demand for nitrogen fertilizer is reduced, and the dosage is reduced to about 15 kg per mu, which can meet the demand for nutrients of tomato color change, but at the same time pay attention to increase the application amount of potassium fertilizer.
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