Summer warming greenhouse management

The production of winter greenhouses is one of the main forms of production in protected areas. In high-temperature and high-humidity weather, the production of greenhouses is basically idle. It is possible to make full use of the idle period of greenhouses to cultivate leafy vegetables during summer. The main technical measures are as follows:

1, select the fine varieties, intensive cultivation. Due to the influence of the former crop production, the soil is very hard, the soil should be deep-turned, and a certain amount of organic fertilizer should be applied. At the same time, the input of nitrogen fertilizer should be increased, and the surface of the plant should be smoothed to prevent water accumulation in the lower area. Select good varieties, before sowing the seeds into 20 ~ 25 °C warm water soak for 5 ~ 6 hours, and then broadcast into the well-made oysters in advance, in order to achieve full Miao, Miao Zhuang purposes.

2. Strengthen field management. Due to the high temperature and large amount of water evaporation, the watering before emergence should be subject to the principles of seeing wet and small ground irrigation, increasing the number of watering and watering after emergence, but there can be no long-term accumulation of water in the water. Into the growth of flourishing period combined with watering, per acre of urea or diammonium 20 kg, harvest two months before the second application, combined with foliar conditions outside the roots of fertilization, so that the seedling strong leaves thick.

3, with advanced shade net technology. The optimum temperature for the growth period of leafy crops is 18-25°C, 15°C at night, and the light intensity is 2.0 lux. The temperature during the relaxation period is generally 28-35°C during the day and the light intensity is 7.0 lux. The use of a greenhouse shed to cover the shade net for production can directly reduce the radiation of sunlight and reduce the greenhouse effect. During the day, the temperature can drop by 2 to 5°C, and the light intensity can be reduced by 50%. The effect of cooling and avoiding direct sunlight can be basically satisfied. Need for crop growth.

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