The influence of agricultural practices on photosynthetic activity and productivity of a new variety of cannabis in the Middle Volga region

Abstract

Relevance. In 2023, a new variety of single-domed drug-free cannabis, Lyudmila, of the fibrous direction of use, passed the State Examination and was approved for accreditation for admis-sion to use on the territory of the Russian Federation. In this regard, research on the development of elements of cultivation technology in specific soil and climatic conditions is of scientific and practical interest.Methods. The scientific experiment is based on methodological guidelines for registration tests offungicides in agriculture and methodological guidelines for conducting field and vegetation tests with cannabis. Indicators of photosynthetic activity of plants in crops were determined by the method of A.A. Nichiporovich. Mathematical processing of experimental data was carried out by the method of dispersion analysis according to B.A. Dospekhov.Results. Foliar top dressing contributed to an increase in the assimilation surface of the leaves in the variants with the treatment of plants for vegetation with preparations: Izagri Phosphorus — from 111.0 to 155.7 thousand m2/ha, Izagri Vita — from 112.2 to 139.7 thousand m2/ha, Humate +7 — from 135.9 to 148.4 thousand m2/ha (with 101.1–114.3 thousand m2/ha under control). The high yield of stems was obtained when sowing with a seeding rate of 3 million germinating seeds per hectare — 15.67 t/ha, with a decrease in the seeding rate to 2.5 and 2.0 million germinating seeds per hectare, the yield of stems decreased to 14.48–12.98 t/ha. Foliar treatments are effective, the yield of stems on the treated variants is higher than the control by 0.36–0.9 t/ha. The highest seed yield was obtained when sowing with a seeding rate of 2.5 million germinating seeds per hectare, on average 0.98 t/ha.