There are three main conditions for the occurrence of crop diseases in winter greenhouses, susceptible to susceptible vegetables, germs, and environmental conditions that are not suitable for growing vegetables. Therefore, the best way to prevent vegetable diseases in greenhouses is to improve the disease resistance of vegetables and the correct use of pesticides. In the production, the following measures should be taken to rationalize and strengthen the roots of vegetables:
There is stress in fertilization. According to the rules of crop nutrient absorption, do not subjectively abuse. For example, every time cucumbers are picked, combined with watering and applying the appropriate amount of nitrogen fertilizer, the cucumber leaves and stems can be quickly supplemented with nitrogen nutrition, so that there is “strength†to continue photosynthesis to grow more cucumbers, but excess nitrogen fertilizer is often applied. Will make the cucumber's stems and leaves bulimia change "puffy" photosynthetic rate will instead fall, inhibit root growth. Those who are top-heavy and tender are more likely to invade germs. Therefore, when cultivating melons, it is better not to use too much of the amount of the fertilizer and to digest it. Secondly, it is better to use potash fertilizer and other organic fertilizers.
Watering tips. The soil is composed of large and small soil particles, and the soil particles are filled with water and gas. More water, less air, poor root breathing, root disease will also appear. Less water and more water will lead to waterless roots and drought problems. Therefore, there are three ways to look at watering in winter: See if the seedlings are really water-deficient; if you look at the ground, if the lyrics are right; if you look at the sky, whether it is suitable for watering. Water is poured around 10 o'clock in the morning on sunny days. Drip irrigation or water pouring under the membrane is used. After pouring, the air is properly dispersed and wet.
Uncover the grass and follow your heart. Greenhouse vegetables should make full use of the sun's light. Only when there is sunlight, can photosynthesis occur. Only when there is yield, can vegetables grow healthily. Therefore, it is best to stick to the grasshoppers every day, especially when it is cloudy. In the morning, the best time to uncover the haystacks is when the temperature in the shed is not obvious (1°C) and can quickly rise after the grass is uncovered; in the evening, the temperature in the shed will not increase much when covered with haystacks ( At 1°C), it is the best time to cover grasshoppers.
Temperature management is more scientific. Taking control of temperature control from morning till night throughout the day is more conducive to the robust growth of vegetables. For example, for cucumbers, the temperature can be controlled by releasing air. In the morning, the temperature rises gradually to about 32°C after about 15°C after unraveling the haystacks in the morning, and the temperature begins to decrease around 13:00, gradually dropping to 20°C around 16:00, gradually dropping to 22:00 after covering the haystacks. At 16 °C, the early morning dropped to a minimum of 13 °C.
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