Many vegetable farmers are neglected in the management of early spring tomato growth in greenhouses, which often leads to tomato diseases in the late growth stage and premature failure of seedlings, which directly affects yield and quality. The management of tomato in the greenhouse should do the following work:
1. Prevent plants from failing prematurely
In the late growth stage of tomato, the branches are too long, so the way for the roots to transfer nutrients to the top is also long, and the nutrients are often in short supply, resulting in the failure of plants. Therefore, management should be strengthened during this period to avoid premature plant decay in later stages. Mainly should do the following:
1. It is necessary to remove the heart, thin the leaves, and break the branches in time. After the last ear of fruit sits, top the heart in time, and the side branches that usually grow between the nodes should be wiped off in time. The old leaves, yellow leaves and diseased leaves under the plant should be removed in time to reduce nutrient consumption. Concentrate nutrients on plants to promote fruit expansion.
2. Spray foliar fertilizer and plant growth regulator. After the plant is enlarged at the last ear, there is no need to carry out fertilization. If the plant is lack of symptoms or the phenomenon of seedling failure, the application of 0.5% potassium dihydrogen phosphate mixed with 6000 times solution of Aiduo harvest foliage is better .
Second, fertilizer and water management should keep up
Tomatoes require a lot of fertilizer. In the case of applying sufficient base fertilizer, reasonable top dressing should still be carried out. In the later stages of tomato growth, nitrogen and potassium fertilizers are needed, and urea and potassium sulfate can be added to ensure that the fruit expands rapidly.
The type of top dressing in the fruiting period should be a special compound fertilizer, and the amount of top dressing should be flexibly controlled according to the growth status of the plant. Combined with watering, the water-soluble compound fertilizer should be applied about 15 kg per mu every time. At the peak of the fruit, in order to improve the quality of the fruit and improve the rate of good fruit, foliar spray of 1% superphosphate or 0.1% -0.3% potassium dihydrogen phosphate solution can also be applied. Tomato drip irrigation under the film can reduce the occurrence of diseases. After entering the fruit-bearing period, when each batch of fruit begins to swell, it is necessary to pour "strong fruit water" 1 or 2 times, and the amount of water can be increased appropriately.
3. Strictly prevent diseases and insect pests
Diseases and insect pests will not only affect the yield of tomato in the later period, but the pathogenic bacteria that spread around will remain in the shed and endanger the next crop of vegetables. Therefore, effective measures should be taken in the later stages of tomato growth to prevent the occurrence of diseases and insect pests. Mainly should do the following:
1. Set up insect-proof nets at the vents to prevent aphids, mites, thrips, whiteflies and other pests from sneaking into the shed, directly harming the vegetables or infecting the vegetables by introducing viruses into the shed. For pests sneaking into the shed, yellow boards can be set in the shed to trap and kill, and 3% acetamiprid 1500 times liquid can be mixed with 10% imidacloprid wettable powder 2000 times liquid to prevent and control.
2. Spray medicine in time. Generally, the diseases that often occur in the later period of tomato include leaf mildew, virus disease and bacterial leaf spot disease, which can be sprayed and controlled in time when the disease first occurs. Leaf mildew is controlled with 47% Garenon wettable powder 800 times liquid spray; virus disease is treated with virus A500 times liquid spray; bacterial leaf spot disease is controlled with DT500 times liquid spray, which can effectively control the development of the disease.
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