Influence of some agrotechnical conditions of hemp cultivation on seed and fiber yield

Relevance. In connection with the widespread introduction of monoecious hemp varieties into the production, it became necessary to study issues related to the effect of seeding rates on productivity and product quality. In particular, it was necessary to study the effect of seeding rates on the yield and quality of seeds, the characteristics of plant growth and development. In addition, it was important for production to establish the effect of the seeding rate on the yield of seeds, stems and fiber, on the technological qualities of the fiber and the sowing qualities of seeds.
Methods. A comparative study was carried out in 2000–2015 on the experimental plots of the Chuvash Research Institute of Agriculture. The sown area of each experimental plot was 20 m2, accounting — 18 m2, the repetition of the experiment was four times. Observations of the growth and development of plants were carried out according to the methodology adopted at the Institute of Bast Crops.
Results. It has been established that the density of the stem stand increases with an increase in the seeding rate for all sowing methods, both on an unfertilized and fertilized background. On a fertilized background with the same seeding rate and sowing method, the density of plants is higher than on an unfertilized background. The number of seeds, seed weight and fiber weight per plant in the experimental variants studied by us decreased with an increase in the seed sowing rate. A similar pattern was obtained for the weight of 1000 seeds. The largest weight of seeds and fiber from one plant was obtained with a single-row sowing method with a seeding rate of 10 kg per ha, and the smallest — with a continuous sowing method with a seeding rate of 100 kg per ha. The highest seed yield on both fertilized and unfertilized backgrounds was obtained with a wide-row sowing method and a seeding rate of 10–15 kg/ha. The highest fiber yield on both backgrounds was obtained with a continuous sowing method with a seeding rate of 80–100 kg/ha.

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