The production of winter-warm 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 in an idle state. Full utilization of the cultivation period of greenhouses for summer vegetable cultivation techniques will fundamentally address the use of greenhouses during leisure and Technical difficulties in vegetable production during the summer. The main technical measures include the following aspects: 1. Selection of fine varieties, intensive cultivation Due to the influence of the former crop production and rain, the soil is very compact, the soil should be intensively ploughed, and a certain amount of organic fertilizer should be applied to the site. At the same time, increase the investment in nitrogen fertilizer, and reduce the amount of water in the lower area. Selection of excellent heat-resistant varieties, such as spinach use Japanese large-leaf spinach species, garland chrysanthemum selection of light leaflets seeds. Before sowing, the seeds were soaked in warm water of 20°C～25°C for 5 hours to 6 hours, and then sowed in the pots of the pre-selected pots in order to achieve the purpose of seedlings. 2. Strengthen field management Because of the high temperature and high temperature water evaporation, the watering before emergence should grasp the principle of seeing wet and small water, and increase the number of watering and watering after emergence, but there can be no long time Accumulation of water, into the growing season to combine 667 square meters of watering urea or diammonium 20 kg watering, flushing the second half of the first two months of harvest, while the combination of foliar conditions outside the root fertilization, in order to achieve the strong leaves thick . 3, the use of advanced shading technology leaves vegetable temperature optimum temperature of 18 °C ~ 25 °C, 15 °C at night, the light intensity of 20,000 lux, the temperature during the leisure period is generally 28 °C ~ 35 °C, light intensity In the range of 60,000 to 70,000 lux, the sunshade net is used to cover the shade net for production, which can directly reduce the solar heat radiation into the greenhouse and reduce the greenhouse effect. During the day, the temperature drops by 2°C to 5°C, and the light intensity is reduced by 50%. Has played a cooling and to avoid the direct effect of strong light, basically meet their growth needs.
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