After the tomato is planted in the greenhouse, it is necessary to pay close attention to the weather changes and irrigate reasonably.
Watering under the ridge
Generally, wide and narrow rows of ridges and mulching film cultivation methods can be used, with a wide row spacing of 80 cm, a narrow row spacing of 50 cm, a ridge height of 10-15 cm, and a row of seedlings per ridge. The two adjacent ridges are covered with two mulches, and the mulch or the dried wheat straw and straw are covered between the wide rows (operation rows) at the same time. According to the measurement, watering under the inter-ridge film can increase the ground temperature by about 5 degrees Celsius, reduce the air humidity by 9% to 10%, and reduce the disease by more than 30%.
Watering frequency and amount
Due to the different growth periods of tomatoes, the appropriate number of watering and the amount of watering should be mastered. Generally in severe winter, when the air temperature and ground temperature in the shed are relatively low, the amount of watering should be small and the interval time should be long. Do not flood the water to prevent low temperature and high humidity from causing rooting. Slowly water the seedlings when planting seedlings, and moderately control the watering of the low-temperature tomato during the planting period; when the first batch of fruit starts to swell, gradually increase the amount of watering; as a result, always keep enough water in the peak period, and the soil in the greenhouse The water volume cannot be lower than 20%.
Selection of watering time
The watering time should be sunny morning, and well water should be used as much as possible. Try to avoid the afternoon or even cloudy days, otherwise it will cause diseases due to excessive humidity in the shed.
There is a difference in watering on a cloudy day
The temperature on sunny days is high, and the amount of watering should be gradually increased, with little or no irrigation on cloudy days. Do not water on continuous cloudy and snowy days. When the weather changes from sunny to overcast, the amount of water should be gradually reduced, and the interval should be appropriately extended; it is best to achieve the combination of watering and fertilization. After fertilizing and watering, it should be reasonably ventilated and ventilated.
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Whether the tomato plants in the greenhouse are short of water
Judging from the soil: the leaky soil should be fertilized and water-retained, and should be watered less frequently; the saline-alkali soil should be irrigated, and the amount of irrigation should be increased;
Judging from the shape of the seedlings: generally the leaves stand up early in the morning, do not sag at noon, which means there is no water shortage; the leaf color is dark green, and wilting at noon is the symptom of water shortage. There are water drops on the edge of the leaves in the early morning, and the upper leaves are lighter in color, which is a manifestation of sufficient water.
The water in the fruiting period has a great influence on tomato yield. After the first ear of fruit sits, it is necessary to ensure sufficient water supply. At this time, when the young fruit turns into a period of rapid expansion, it is necessary to end the squat seedlings, watering and top dressing to promote fruit development and expansion.
During the fruit-bearing period, sufficient fertilizer and water are needed to obtain high yield. Watering should be even, not large and small, to prevent the occurrence of physiological diseases of the fruit. When watering, usually choose a sunny morning, which is conducive to the rapid recovery of soil temperature and avoid hindered root development.
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