It is very important to improve the winter weather in the winter weather. How to improve the "cold strength" in the greenhouse? Let me share with you how to improve the "cold strength" in greenhouse vegetables.
What is the freezing damage?
The main cause of physical disorders
First, the freezing damage causes the physiological processes such as photosynthesis, respiration and transpiration of vegetables to be blocked;
The second is to dehydrate the cell protoplasm to cause "cell drought", and severely die;
Third, the activity of nitrifying bacteria in the soil decreased, and ammonia nitrogen was difficult to be converted into nitrate nitrogen, which restricted the absorption and operation of nitrogen fertilizer.
The physiological barriers caused by low temperature to vegetables are mainly manifested in several aspects:
When the seedlings suffered from freezing damage, the two cotyledons first lost green and then slowly whitened. After colonization, the true leaves are dark green first, then gradually lose water and wither;
The top of the seedling grows frozen, the growth point turns black, and it gradually kills and kills;
The roots are frozen, and the lateral roots and root hairs turn from white to yellow to brown, and the absorption and fertility functions are weakened;
The flowering period is frozen, making it difficult for the pollen to germinate, or the pollen tube is difficult to elongate, resulting in poor fertilization of the young fruit, resulting in the appearance of grotesque fruits.
These parts of the vegetables suffer from freezing damage, which can affect the yield and quality, and even severely.
What is the low temperature?
In order to make the vegetables in the sheds grow at a low temperature, they still grow safely and normally. According to the practical experience of investigations in recent years, the following defensive measures should be taken.
First, add organic fertilizer
The vegetables in the sheds need more fertilizer than the vegetables in the open field. Because of the long period of fertilizer supply, it is necessary to add organic fertilizers, especially the fertile manure of livestock such as cattle, horses, pigs, and every half acre of plastic greenhouses. Decomposed manure 2500-3000 kg.
Topdressing advocates the use of bio-organic fertilizer, 50 kg per half-acre greenhouse, or 25-30 kg of bio-organic compound fertilizer. This kind of fertilizer is easy to operate, has a long delay period, purifies the environment and reduces pollution. In the process of releasing organic fertilizer, it can increase heat, stabilize the temperature of the shed, and prevent sudden changes in cold and warm. When topdressing, it is necessary to combine the cultivating and loosening soil to break the knot and control the transpiration of the groundwater to remove the heat energy, so as to protect the heat preservation.
Second, carry out low temperature exercise
Vegetable seedlings that use low temperature exercise can enhance cold resistance. First, the newly germinated vegetable seeds are subjected to low temperature treatment; the second is to use high temperature during the day and high temperature difference at night to raise seedlings; third, to open the greenhouse door ventilation and refining repeatedly on sunny days to prevent high temperature when the day is fierce, 10 days Subject to cold, causing flash seedlings or freezing damage, so that the treated seedlings encounter cold current can enhance stress resistance.
Third, multi-layer coverage of sunny planting
Choose a relatively stable sunny day planting seedlings, the root system and the soil are easy to stick, the survival rate is high, the seedling is fast, and the seedlings are easy to grow. One can be planted with a seedling and covered with a small shed; the second can be covered with micro-film to cover the soil, then planted with a small shed, and double or three-film cultivation can effectively increase the temperature inside the shed.
Fourth, explore some new methods of temperature increase and insulation
First, spray warm water in the greenhouse film to form a mist to slow the loss of heat; second, spray 100-300 times of rice vinegar solution on the foliar surface to increase the sugar content and hardness of vegetable leaf meat and improve cold resistance; Where conditions permit, the light can be used to fill the light in the greenhouse, and the darkening reaction can be performed by turning off the lights for several hours at night.
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