Cucumber in the greenhouse under low temperature

Affected by the recent snowfall cooling, cucumbers in many greenhouses have experienced severe low-temperature barriers. Investigations have found that many greenhouses have been overwintering and cucumber plants have become weak, growth points have become smaller, and even stagnant; large melon strips grow slowly, and small melons grow slowly. The phenomenon of melons is serious; the leaves are chlorotic, and the leaves turn down into a parachute shape; the lower capillary roots disappear, some of the lateral roots become yellow and necrotic; the cucumber yield is low, and the commerciality is greatly reduced. According to the current growth status, the author thinks that the following aspects should be taken from To start, add emphasis:

First, the temperature management should be based on strengthening the insulation, and the timing of grasshoppers should be suitable. After drafting, the water droplets on the inner surface of the film do not freeze. If water droplets freeze on the inner surface of the greenhouse film, it may cause frostbite at the plant growth point near the front end of the greenhouse. Therefore, according to the actual situation of temperature changes, we should choose the right time to expose the grasshopper. In the evening, it is necessary to put grass in a timely manner. Do not wait until the temperature in the shed has dropped rapidly. This will lead to insufficient accumulation of effective temperature in the room, especially if the temperature is too low in the middle of the night and the transport of photosynthetic products is not smooth, which directly affects the distribution of substances in the plants.

Second, the roots of this period of plant management to protect roots and leaves, in particular, root conservation is the top priority. The amount of watering cannot be too large at one time, avoiding water damage. Properly extend the number of days of watering to avoid causing excessive soil moisture, resulting in poor root respiration and necrosis of roots. In addition, wheat straw, corn stalks and other forages can be covered in the operation line, which not only helps to enhance the permeability of the soil, but also has a significant effect on increasing the temperature. In addition, with regard to the use of fertilizers, the amount of chemical fertilizers should be appropriately reduced, combined with biological bacterial fertilizers, and roots should be used to promote root growth. If it is difficult to meet the water conditions in continuous shade, it can be solved by means of fertilizer and water combined with root irrigation. 300 times Haifa Polyton (or 300 times of U.S. speed) + 300 times of rooting agent can be used for watering to promote rooting and The supply of nutrients also helps to prevent excessive humidity in the field and reduce the occurrence of diseases. In the low temperature season, the root activity and absorption capacity are poor, and it is easy to cause insufficient supply of nutrients to some of the above-ground parts such as leaves. In order to alleviate this contradiction, we can use foliar fertilizer to supplement foliage, and 500 times Haifa Poly can be used. Mix 1000 times more cytokinins, but also 600 times the amount of Xingnongbaifei can be used for foliar spray, nutritional supplements at the same time, enhance the plant's ability to resist cold. For the parachute-like leaves, the leaves are supplemented with 1000-fold calcium and 1000-fold cytokinins while the roots are well protected. The leaf growth can be well improved.

Third, timely pick melon, melon, remove the old leaves of the lower part of the plant to meet the standards of commodity standards, should be promptly removed from the sale, reduce unnecessary nutrient consumption. In the cold season, when cucumber plants grow poorly under low temperature conditions, due to their growth characteristics, they tend to have reproductive growth. That is, under the condition of poor cucumber growth, many male and female flowers appear at the top. In the management process, according to the Guagua plan, the development of deformed melons should be promptly eliminated to reduce the burden on the plants. This will also reduce the chance of infection by gray mold.

Fourth, rational use of drugs During the cold season in winter, the growth of various parts of the plant is slow, the disease is serious, the amount of medication is large, so this period in the prevention and treatment of diseases to be coordinated in many ways, timely ventilation and dehumidification, the amount of one-time mixing agent can not be too large, so as not to Burning leaves. Rational use of drugs to reduce the chemical damage of the leaves.

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