Management technology of plastic small arch shed after early spring tomato planting
First, the management technology after planting: After the planting to promote slow seedlings, should be closed sheds, improve the shed temperature and ground temperature, 35 ° C during the day, the night temperature can reach 16 ° C or more. After the seedlings are slowed down, the temperature of the shed should be lowered by releasing the air, and it should be kept at 28-30 °C during the day, and should not exceed 30 °C. When the daytime temperature reaches 20 °C or above, the shed film can be uncovered to make the seedlings fully visible, and the environment in contact with the outside environment. When the night temperature is not lower than 10-12 °C, the film can no longer be covered at night until the end of the night frost. When the average temperature is stable above 18 °C, the film can be removed and transferred to the open field for growth. Afterwards, the shelves were inserted and pruned in time to enter normal management.
Second, water and fertilizer management: tomato plants are large, the results are more, the root absorption capacity is strong, more water is needed, after slow seedlings, after 7-10 days, combined with watering to apply a seedling fertilizer, 500 kg per mu, and then Carry out seedlings. When the first ear fruit begins to expand, 15-20 kg of urea is applied per acre combined with watering. The amount of water should not be too large. The first ear will be harvested. When the second ear is swollen, 10 kg of urea will be applied per acre. Because of the increased water demand, water should be poured every 7 days, but the topdressing should be uniform. Otherwise, the fruit or umbilical is easy to appear. Rot, in the fruiting period, can also be sprayed with 0.2-0.3% potassium dihydrogen phosphate or 0.2-0.3% urea to prevent premature aging.
Third, the plant adjustment: after the seedlings, watered, should be inserted in time, generally early tomato ripe fruit 3 sections, 1 meter high pole each inserted one, adjacent two rows of four heads tied together, Tied the vines in time after insertion and should be tied once under each ear. Tomato has strong branching ability, and almost leaves have sputum. It should be pruned in time to make small mites. When the third ear is blooming, 1-2 leaves should be left on it. Early heart removal reduces nutrient consumption and promotes fruit expansion and early maturity. After harvesting the first and second ear fruits, the lower aged yellow leaves should be destroyed. In order to prevent falling flowers, in addition to strengthening management, you can use 10-20 PPM 2,4-D flowers, or 25-30 PPM tomato spirits at 8-9 am every day. Spraying, should pay attention to: strict control of the concentration, unopened flowers do not spray can not spray the drug on the plant, otherwise it will cause phytotoxicity, make the branches and leaves twisted and shrink, open a batch, a batch, increase before and after pouring The amount of water topdressing. In order to increase the income in the morning market, when the fruit turns from green to white, the fruit is coated with 1000mg/kg of ethephon to promote early redness.
Fourth, the prevention and control of pests and diseases: tomato seedlings, such as high humidity, low ground temperature, prone to stagnation disease, in addition to strengthening the light, improve the ground temperature and release the wind, after the diseased plant is removed, can be sprayed twice with 7.5% chlorothalonil 1000 times solution ,once a week. For leaf mold and early blight, 600-800 times solution of chlorothalonil can be used for prevention and treatment. The cotton bollworm and aphids can be controlled with 2.5% deltamethrin 8000 times solution.
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