Effect of organic extracts on growth of guar plants (Cyamopsis tetragonoloba (l) Taub) in closed ground conditions

Guar (Cyamopsis tetragonoloba) is a valuable crop grown to produce gum used in the food industry. At the same time, guar biomass can be used to feed animals. Guar is not inferior to soybean oil meal in nutritional value. The main criteria for choosing a guar variety are: plant growth rate, grown plant biomass and their nutritional value. When growing guar in artificial and closed ground, special attention should be paid to the organomineral fertilization system. In this paper, we studied an effect of zoohumus extract (ZG) produced by the Black Soldier fly (Hermetia illucens Linnaeus) during the processing of food organic waste, and fulvic acid extract (FA) from lake sapropel on guar plants. An effect of three types of organomineral fertilizers on seven guar varieties taken from the collections of the Caspian Agrarian Federal Research Center of the Russian Academy of Sciences and the N. I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) was studied. The plants were grown under controlled lighting and in closed artificial soil conditions. The control used a mineral solution of Hoagland's NPK. In the variants with the use of organic fertilizers, the dose of Hoagland's NPK solution was reduced by 4 times. At the end of the 20-day experiment, biometric indicators and profiles of chemical elements in the plants were measured. The profiles of chemical elements were processed by the authors' computational neural network program, which calculates the dimensionless index of cognitive significance CSI = 0…10 (Cognitive Salience Index), representing the level of fractal composition of chemical elements in plants and the rate of mass-accumulative biochemical processes in them. The highest CSI values were observed in guar plants of the Pobeda-17 and Avangard varieties grown with NPK + FA. Guar plants of the Nakhodka variety demonstrated the highest rate of mass accumulation processes with NPK+ZG. This confirms the feasibility of partial replacement of mineral fertilizers with organic additives.

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