As the temperature gradually rises, the tomato plants begin to gradually grow into normal growth, but still need a period of recovery, management must master the following points. temperature. Temperature rise is good for vegetable growth, but the higher the better, the temperature should be adjusted according to the habits of the vegetables. Tomatoes are warm and light vegetables. The temperature is 20-28 ° C during the day and 12-16 ° C at night.
Recently, when I went to the countryside, I found that some farmers had temperature management that was not in place. The temperature of the shed exceeded 32 °C and did not release the wind, which was not good for the growth of tomatoes. It is recommended that the vegetable growers, after the grass hazelnuts are pulled up in the morning, the temperature starts to ventilate when the temperature exceeds 30 °C, and then the temperature of the air outlet is closed when the temperature is lower than 20 °C. Look at the day management, you may release the wind several times a day, or you may only put it once.
Pest Control. In the spring, low-temperature and high-humidity diseases such as gray mold disease should be alleviated, but the temperature is slightly higher, and the diseases with less stringent humidity requirements will be aggravated, such as leaf mold, powdery mildew and root knot nematode disease. Then there are pests, such as whitefly, aphids, and Liriomyza sativae.
For these pests and diseases, early prevention and early treatment should be achieved. For leaf mold, 60% anti-mildew (carbendazim hydrochloride) 500 times solution, 25% azoxystrobin suspension 800 times solution, 25% tebuconazole 2500 can be used. - 3000 times solution, 25% oxazolidine 800 times solution and 2% spring erodemycin 300 times solution spray control, pay attention to alternate medication, 2-3 times in a row.
Powdery mildew can be controlled by the following agents, 10% difenoconazole microemulsion 2000 times solution, 50% ether oxystrobin dry suspension agent 3000 times solution, 30% terfenprozil (fluoxazole) 2000 times solution spray, continuous 1- 2 times.
Root knot nematode disease is more than 750 grams per acre, mixed with a small amount of fine soil around the plant, and then watered; or 1.8% of Aino No. 3 with water, 1 kg per mu, valid for 2 months. Insects can be trapped by yellow plates, economical, safe and effective. 50 pieces per acre can be added, and sexual attractants can also be added. These insecticide methods are the best method for greenhouse early spring.
Put the grass to keep warm. Temperature management is important, but science should not be copied. The shape of the shed is different. The lighting and heat preservation are different. The high-temperature vegetables and the warm vegetables are not the same, so it is different to put the grass. The scientific method is to determine the time of putting the grass in the morning and evening according to the insulation effect of the greenhouse. The principle is that the grass scorpion is pulled up in the morning and the temperature is 12-15 °C. If the nighttime temperature exceeds 12 °C, you can not put the grass.
Tomatoes have the characteristics of water, large water demand and strong drought tolerance. According to the relevant practical experience, the watering techniques of greenhouse tomatoes are as follows:
Watering must be carried out according to the characteristics of different growth periods. Under normal circumstances, the tomatoes are planted while watering, and after pouring the water for 3 to 5 days, the seedling water is poured again, until the first ear is sitting and the size of the egg yolk is poured again. As a result, the early planting was small, the leaf transpiration was small, the number of fruits was small, and the ventilation was small. Generally, water was poured for 7 to 10 days (the amount of water was small).
Later, with the growth and development of the plant, the number of fruits increased, the ventilation increased, and the transpiration increased. The number of days between watering and the amount of watering should be shortened, and the soil should be dry and wet (mainly wet), harvested. The soil should be kept moist to increase the weight of the single fruit.
Watering according to the characteristics of the time. Overwintering tomatoes cultivated in winter-heated greenhouses, in addition to pouring water and timely cultivating and cultivating in the planting period, generally do not need to be watered after sitting in the first panicle, and can be covered with mulch to keep moisturizing after pouring water. Then carry out a small water under the membrane to avoid lowering the ground temperature. After the weather warms up, increase the amount of water to meet the growth and development of the fruit. The greenhouse tomatoes cultivated in early spring should be watered in time to meet the water demand.
Watering according to the growth. The plant is dark green, the leaves are shiny, green and flat, and the heart leaves are stretched, which is an even and appropriate expression of moisture. If the heart leaves are not shrinking, the leaves are dark green, and the mild leaves are drooping on sunny days. If the heart leaves are over-expanded, the leaves are large and thin, and the leaves are spit with too much water. It is a manifestation of excessive water, and should be controlled by water.
Watering time in the greenhouse for one day. During the growth period, you should choose sunny watering in the morning. After watering, it should be ventilated and drained. It is not suitable to water in the afternoon, evening or rainy days. Otherwise, the humidity in the shed will be too large, causing downy mildew and other diseases. It is not suitable for watering at noon. In order to avoid the high temperature watering affecting the physiological functions of the root system; the weather is hot in the middle and late stages, and the greenhouse can be ventilated day and night. Water should be given in the morning and evening to cool down. Watering during fruit picking. Tomatoes should be watered before harvesting, which increases the value of the fruit.
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