Before the colonization and flowering of tomato, the plant growth is small, the demand for nitrogen fertilizer is low, and the nitrogen fertilizer in the soil can fully meet the needs of tomato plant growth. Therefore, there is no need to apply nitrogen fertilizer in this period.

From the tomato into the flowering period, as the temperature rises, the growth rate of the plant is accelerated and the growth rate is increased. At this time, attention must be paid to the start of nitrogen fertilizer application to ensure the supply of nutrients to the tomato. When opening the first spike, 20-25 kg of nitrogen fertilizer can be topdressed per acre and potassium fertilizer can be used to promote the normal growth of tomato. From the first fruit set of the first ear of tomato to the fourth fruit set of the tomato, the transpiration of the tomato is increased due to the gradual increase of the temperature, and the time interval of watering is gradually shortened, so that the nitrogen fertilizer can not be too much for each flush. Reduce nitrogen loss with water. Can also be watered and flushed with water every time, pay attention to reducing the amount of application is appropriate.

When the tomato enters the harvesting stage, the demand for nitrogen is reduced. At this time, the use of nitrogen fertilizer can be reduced to about 15 kg. This can meet the demand for nitrogen fertilizer in tomato color transformation, but pay attention to increase the application rate of potassium fertilizer.

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