There are three main conditions for the occurrence of crop diseases in winter and greenhouse, which are susceptible to susceptible vegetables, pathogens and environmental conditions that are not suitable for vegetable growth. Therefore, the best way to control the disease of vegetables in greenhouses is to improve the disease resistance of vegetables and the correct use of pesticides, that is, both the symptoms and the root causes. In the production, the following measures should be taken to make the roots of vegetables more rational and strong:
Fertilization is stressful. Fertilize according to the law of nutrient absorption by crops, and do not subjectively blindly abuse. For example, each time after picking cucumbers, combined with watering and applying appropriate amount of nitrogen fertilizer, you can quickly supplement the cucumber stems and leaves with nitrogen nutrition, so that it has “pneumatic power†to continue photosynthesis to grow more cucumbers, but excessive application of nitrogen fertilizer often It will make the cucumber leafy gluttony become "fat" photosynthetic rate will decrease, inhibiting the growth of roots. Fat people with top-heavy skin and tender meat are more likely to invade the bacteria. Therefore, when the fertilizer is applied in the melon period, the right amount should not be too much, so it is easy to digest; the second is to be applied in combination with the potash organic fertilizer, and the effect is better.
Watering skills. The soil is composed of large and small soil particles, and the soil particles are filled with water and gas. The water is less gas, the roots are not breathing well, and the root disease will also appear. If there is less water and more gas, it will lead to no water to drink, and there will be drought problems. Therefore, there are three ways to water the winter: see the seedlings, whether it is really lack of water; seeing the land, whether the lyrics are appropriate; seeing the sky, is it suitable for watering. Watering at 10 o'clock in the morning on a sunny day, drip irrigation or small water under the membrane is poured, and the water is properly ventilated after pouring.
Uncover the grass and do not care. Greenhouse vegetables should try to use the sun's rays. If there is light, there will be photosynthesis, and then there will be yield, and vegetables can grow healthily. Therefore, it is best to insist on uncovering grasshoppers every day, especially on cloudy days. In the morning, when the temperature of the shed in the shed is not obvious (1 °C) and the rapid rise in the shed is the best time to uncover the grasshopper; in the evening, when the grass is covered, the temperature in the shed does not increase much ( At 1 ° C), it is the best time to cover the grass.
Temperature management is more scientific. It is more beneficial to the healthy growth of vegetables by taking the temperature control from morning to night for management. For example, for cucumbers, the temperature can be regulated by the release of air. In the morning, it gradually rises to around 32 °C from 15 °C after the grasshopper is uncovered in the morning. The temperature starts to decrease around 13:00, and gradually drops to 20 °C around 16:00. After the grass is covered, it gradually drops to 22:00. At 16 ° C, it drops to a minimum of 13 ° C in the early morning.
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