What do you need to pay attention to when growing tomatoes in the greenhouse during the hot season?

At present, entering the high temperature and rainy season, the temperature is often as high as 35 ℃, which is not suitable for the growth and development of tomato planting in the greenhouse. Physiological obstacles will occur in pollination, it is difficult to set fruit, and the damage of diseases and insect pests is also very serious, so it is necessary to prevent high temperature and do a good job in summer management.

1. Keep the film and dig the drainage ditch to prevent rain and waterlogging. The large opening of the top tuyere and the bottom tuyere can smooth the air convection in the shed, remove the hot air in time and reduce the temperature and air humidity in the shed. In addition, the film has been aged and polluted at this time, and the light transmittance is reduced to about 50%, which can play the role of shading and cooling, and the temperature inside the shed can be reduced by about 3 ℃ compared with that outside the shed, which can be maintained within the suitable temperature range for tomato growth and development, so as to ensure normal pollination and fruit setting of tomatoes.

two。 Meticulous sprouting and branching, strictly prevent the vegetative growth from being too prosperous, causing the vegetative growth to exceed the reproductive growth, causing the plant to grow excessively, resulting in falling flowers and fruits.

3. A large amount of organic fertilizer can be applied once in the operation bank, 60kg to 80kg per ditch, to promote soil ventilation, intensify root activity, improve absorptive capacity, maintain robust growth, and increase autumn yield.

4. Pick the heart in the first and middle of August to control the vegetative growth and ensure that the young fruit grows into a big fruit before pulling seedlings.

5. Strengthen the prevention and control of diseases and insect pests to ensure the healthy growth of plants and fruits. First, insect control nets should be set up at the top tuyere and the bottom tuyere to strictly prevent pests from entering the greenhouse from the tuyere. If aphids, whitefly, cotton bollworm, tobacco green insects and other pests have entered the shed to damage the plant, it should be killed by spraying in time. Second, attention should be paid to the prevention and control of leaf mold, early blight, gray mold, soft rot, canker and other diseases.