Lactuca sativa L. cultivation agrobiological estimation when using organo-mineral substrate fillers in low-volume hydroponics conditions

The aim of the study was the agrobiological evaluation of Lactuca sativa using organic-mineral fillers of substrates based on rice husk and Laminaria japonica in the conditions of low-volume hydroponics of the FSBEI HE Primorsk State Agricultural Academy. Research objectives are to study the agrochemical nature of substrates fillers obtained from local raw materials on the basis of rice husks and Laminaria japonica; to analyze the influence of organomineral substrates fillers on the formation of elements of the architectonics of the vegetative system of Lactuca sativa grown hydroponically; to analyze the yield of varieties of Lactuca sativa.The object of the study is Lactuca sativa varieties Moskovskii parnikovyi and Kucheriavets odesskii; organic-mineral fillers of substrates based on rice husk and Laminaria japonica. The main re-search methods to determine sowing qualities (germination) of the studied varieties of Lactuca sativa, germination energy (in accordance with GOST 12038-84); agrochemical analysis of nutrient solutions and fillers; phenological observations of the growth and development of Lactuca sativa. The research results made it possible to choose the most effective organomineral substrates fillers for low-volume growing of green crops, including Lactuca sativa. In the course of the research, we analyzed the germination of the studied varieties of Lactuca sativa, on the basis of which further studies were carried out with the variety Kucheriavets odesskii. The use of Laminaria japonica powder as an organomineral filler for a substrate in a hydroponic system showed that a gel-like pillow formed in a humid environment leads to the death of plants due to the lack of the possibility of developing a Lactuca sativa rosette and very active growth of the root system. The use of rice husk as a filler for the substrate made it possible to obtain high quantitative and qualitative indicators of the yield of the Lactuca sativa of the variety Kucheriavets odesskii, as well as to shorten the growing season of the crop by 12 days.