1. Do a good job of keeping warm and cold protection inside and outside the greenhouse.
The most suitable temperature for small cucumber fruit is 25-30 ° C during the day and 13-16 ° C at night. The minimum shed temperature should not be lower than 8 ° C, otherwise it will cause cold damage and cause a lot of falling flowers and fruits, and even melons to wither. Therefore, before the cold current arrives, try to add a double-layer film around the plastic greenhouse, and add a double-layer straw curtain between the two layers facing west and north to prevent cold attacks. At the same time, a layer of fresh, dry rice and wheat straw is laid in the planting row to increase the ground temperature. In addition, in rainy and snowy days, a layer of agricultural film or rainproof cloth with the same size as the shed must be covered on the outside of the grass curtain to prevent the rain and snow from soaking the grass curtain and reducing the thermal insulation effect. Add 2 to 3 layers of shading nets in between to better protect against cold and warmth.
2. Enhance and adjust lighting.
On a sunny day, under the condition that the temperature of the shed is not excessively reduced, the straw curtain and the sunshade net are opened early and late to make the plant see as much light as possible. In order to improve the light transmittance of the greenhouse film, the greenhouse film should be cleaned once a week. In rainy and snowy weather, it is necessary to pull the straw curtain at noon during the rain and snow, so that the plants can see the light for a short time. Do not pull the straw curtain for a few days. When the continuous long rainy weather suddenly turns sunny, the straw curtain should be opened at intervals to make the plants gradually see the light. Do not unveil the curtain after a long rainy and snowy weather, and fully expose it. At the same time, try to create conditions to hang in the autumn and winter Reflective screens can also significantly improve and increase the lighting conditions in the greenhouse.
3. Strengthen fertilizer and water management.
Generally, the soil moisture in the greenhouse is irrigated every ten days and a half months, around 10 am, and the water temperature and ground temperature should be adjusted to a difference of 2 to 3 ° C. Do not disregard the time, place, or sentiment, or according to seedlings. Under the condition of diffuse irrigation, it is recommended to use sub-membrane furrow irrigation, hole irrigation and drip irrigation. In the case of sufficient base fertilizer, it is not necessary to apply fertilizer in late autumn and winter. When it is necessary to supplement fertilizer according to the growing situation, it is possible to apply 15 to 25 kg of urea and 10 kg of potassium sulfate per acre with irrigation. Every 15 to 20 days can be combined with spraying, foliar spraying fertilizer, such as spraying photosynthetic micro-fertilizer or 0.2% potassium dihydrogen phosphate and urea mixed solution.
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