The demand for leafy vegetables in the market is high,and hydroponic technology has become an important development direction for leafy vegetable production due to its high efficiency,environmental protection and no soil pollution.To achieve the annual production of hydroponic leafy vegetables,deep flow techinque of Lactuca Sativa,Brassica chinensis and Brassica communis was carried out in multi-span glass greenhouses.In a deep liquid flow of 35-45 cm,the pH value of the nutrient solution is controlled between 5.5-6.5 and the EC value is controlled between 2.0-2.6 mS/cm by using a pure water filtration system,nutrient solution preparation system,nutrient solution circulation system,timed oxygen-increasing system and environmental regulation system.At the same time,the highest temperature in summer is controlled below 30 ℃,and the lowest temperature in winter is controlled above 5 ℃ to meet the nutritional and environmental requirements of leafy vegetables in different seasons.By combining key technical processes such as variety selection,seedling production and transplantation,high yield and high efficiency of hydroponic leafy vegetables can be achieved.
关键词
深液流/水培/玻璃温室/周年化/环境调控/叶菜
Key words
deep liquid flow/hydroponics/glass greenhouse/annualization/environmental regulation/leafy vegetable
维普
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