Before planting from tomato to flowering, the plant growth was small, the demand for nitrogen fertilizer was low, and the nitrogen fertilizer applied in the soil could fully meet the needs of tomato plant growth. Therefore, it is not necessary to apply nitrogen fertilizer during this period.
From the time when the tomato enters the flowering stage, as the temperature rises, the growth rate of the plant increases. Pay attention to the start of the application of nitrogen fertilizer to protect the nutrient supply of the tomato. When the first spike flower is opened, it can be applied with about 20~25 kg of nitrogen fertilizer per mu, and the application of potassium fertilizer can be used to promote the normal growth of tomato. In the fruiting period of tomato flowering, the fruit fermented Tingling enhances the pollen fertilization quality, and has a strong cycle fruit setting rate, promotes fruit development, no deformity, no empty shell, no glutinous grains, good uniformity, improved quality, and high yield of fruits and vegetables.
From the first fruit setting of tomato to the fourth panicle fruit setting of tomato, because the temperature is gradually increased, the transpiration of tomato is increased, and the interval of watering is gradually shortened, so the nitrogen fertilizer can not be excessively applied every time. 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 tomato enters 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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