SCREENING STUDY ON THE FORMULATION OF NUTRIENT SOLUTION FOR HYDROPONIC GREEN LEAF LETTUCE IN PLANT FACTORY WITH ARTIFICIAL LIGHT
Abstract
The article presents the data of screening studies of the optimal composition of the nutrient medium for the hydroponic cultivation of green lettuce leaves in rooms with piece light. With the rapid development of soilless cultivation and artificial light plant lighting technology, the greenhouse and the plant factory with artificial light (PFAL) have become the main production base of vegetables and played an important role in agricultural production. An PFAL is a completely closed agricultural production mode that relies on artificial light, does not need soil and is not affected by climate. It can be built in urban centers, underground, deserts, ruins, and even the universe and space, so as to realize annual uninterrupted, large-scale, industrialized and clean vegetable production and ensure high-quality and sufficient market supply in four seasons. It may become the mainstream mode of productive urban agriculture in the future. In order to screen the nutrient solution formula suitable for the large-scale hydroponic culture mode of green leaf lettuce in PFALs, the effects of different water-soluble fertilizer nutrient solutions on its growth were studied through hydroponic cultivation experiments. Arnon and Hoagland general formula were selected as treatment group I (T1), leaf vegetable A formula from the Agrochemical Laboratory of South China Agricultural University as treatment group II (T2), Yamazaki formula (lettuce) as treatment group III (T3), Japanese Garden test general formula as treatment group IV (T4), and the commercial water-soluble leaf vegetable fertilizer produced by Henan Xinlianxin enterprise as experimental control group (CK). The experimental results showed that in terms of fresh mass of stems and leaves, fresh mass of roots, root to crown ratio, plant height, stem thickness and number of leaves, both T2 and T4 could be used and followed by T3 for hydroponic green leafy lettuce in PFALs. T3 was the best formula in terms of appearance. This paper provides a reference to large-scale hydroponic production of green leaf lettuce in greenhouses and PFALs.
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