Winter greenhouse management should pay attention to several points
Winter snowfall often occurs. Occasionally, there will be large snowfall. Vegetables grown in greenhouses will have different degrees of frost damage. How to prevent freezing damage and remedy damaged greenhouse vegetables? The following measures are introduced for reference.
1, timely cover grass and quilts. As early as possible when the temperature permits and late cover grass quilts and quilts (including various greenhouse insulation facilities). The time for dismantling grasshoppers should be as follows: the temperature in the greenhouse after uncovering grasshoppers should not fall, and the time for grass cover should be determined according to the season and indoor temperature. The minimum air temperature should be within the temperature range of 0°C to -15°C. To 15 °C ~ 17 °C, when the minimum temperature in the following season -15 °C, should be in the greenhouse temperature to 17 °C ~ 19 °C when the grass cover. Poorly insulated solar greenhouses should be covered earlier. On sunny days, grasshoppers should cover the cover as early as possible to extend the time for vegetables to see the light. On cloudy days, according to the outside temperature conditions, the grasshoppers can be uncovered at noon for a short period of time to make the vegetables receive scattered light and cannot be uncovered for several days in a row. thatch. After the continuous cloudy snow weather suddenly turns cloudy, attention should be paid to adopting intervals and alternately exposing, and the grass weeds cannot be uncovered immediately to prevent the crop leaves from losing water and wilting under strong light. If you find that the leaves are wilting, you should promptly cover the grasshoppers and wait until the plants recover.
2, pay attention to scientific fertilization irrigation. In winter, strict water management is required. In the season where the minimum temperature is below -15°C in the outside world, it is generally not possible to water. Should be in the minimum temperature of -10 °C above the season to choose sunny watering, covering the plastic film protection. If there is a lack of water in the vegetables, the cold flow should just be selected. If the weather is fine, use drip irrigation under the membrane or water under the membrane to avoid lowering the ground temperature. In the winter season, the greenhouse temperature in the greenhouse is relatively low, and the roots of the greenhouse have weak absorption capacity and slow growth. The soil should be topdressed as little as possible. However, the foliar dressing may be properly applied to alleviate the poor growth of vegetables caused by low temperature and low illumination. Surface spray 0.3% potassium dihydrogen phosphate plus 0.3% calcium nitrate, 1% glucose solution. After the spring air warms up in late winter, the number of watering and fertilizing should be appropriately increased.
3, strengthen the control of humidity and disease prevention. In deep winter or continuous low-temperature rain and snow weather, the humidity in the greenhouse is high and it is easy to induce damage. Ventilation should be conducted at a short time in the middle of noon to control the occurrence of disease. Special attention should be paid to the indoor temperature range of 15°C to 25°C. The relative humidity is controlled below 90%. . After the onset, aerosols and dust can be used for prevention and treatment to facilitate uniform application and to avoid excessive humidity in the greenhouse.
4, appropriate control of the number of results. Sustained low temperature, rain and snow conditions, weak plant growth, early fruit harvesting and appropriate sparse fruit thinning, so as not to increase the burden on the plant, making the plant more fertile, reduce resistance to stress. After fine weather, it gradually transferred to normal management.
5. Attention should be paid to the prevention of severe storms and snow cooling and disasters.
Strengthen strong wind precautions. When detaining membranes, use a special laminating line to fasten the membrane. After covering it in the evening, push the two fine-gauge steel cables to prevent nighttime grasshoppers from blowing together with the outer membrane. In the windy days, the air vents and the doorways are closed to prevent the strong wind from blowing into the shed to cool the shed.
Strengthen snow prevention, prepare spare columns in advance, and in case of heavy snow, promptly replenish the columns to prevent the collapse of the greenhouse; middle and small snow can be cleared of snow after snow, but snow should be followed by sweeping snow to prevent snow from over-compacting Greenhouses; remove snow from the greenhouses in a timely manner, clear drains, and prevent snowmelt hazards.
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