How to apply nitrogen fertilizer to spring 茬 tomatoes

Before planting from tomato to flowering, the plant growth is small, the demand for nitrogen fertilizer is low, and the nitrogen fertilizer applied in the soil can fully meet the needs of tomato plant growth, so it is not necessary to apply nitrogen fertilizer during this period.

From the time when the tomatoes enter the flowering stage, as the temperature rises, the growth rate of the plants increases, and the growth amount increases. At this time, it is necessary to start to apply nitrogen fertilizer to ensure the nutrient supply of the tomatoes. When the first spike flower is opened, about 20 to 25 kilograms of nitrogen fertilizer can be applied per acre, and the application of potassium fertilizer can be combined to promote the normal growth of the tomato. From the first panicle of the tomato to the fourth panicle of the tomato, the transpiration of the tomato is increased due to the gradual increase of the temperature, and the interval of the watering is gradually shortened, so the nitrogen fertilizer applied per time cannot be excessive. Reduce the loss of nitrogen fertilizer with water. It is also possible to apply water-soluble flushing fertilizer every time watering, and it is advisable to reduce the amount of application.

When the tomatoes enter the picking period, the demand for nitrogen is reduced. At this time, the amount of nitrogen fertilizer can be reduced to about 15 kg, so that the demand for nitrogen fertilizer can be satisfied by the tomato color change, but attention should be paid to increasing the application amount of potassium fertilizer.
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