Influence of the seeding rate on the formation of anatomical features of the monoecious hemp stems of Diana breed

Abstract

The article considers the research results on the influence of the seeding rate on formation of anatomical features of the monoecious helm stems of the Diana breed. According to the experiment scheme, the seeding rate is from 0.1 to 2.7 million pieces of germinating seeds per hectare. The size of each plot is 10 × 10 m (100 m2). The tier is 3-fold. Nature of the change in the thickness of the bast-fibered layer depending on the seeding rates was studied. The results of the research showed that the thickest bast-fibered layer (530.5-636.4 μm) is formed due to the seeding rates of 1.8–2.7 million pieces / ha. Thus, there is a reason to assume that the increased seed rates allow achieving the best yields indicators of the bast-fibered substances. It is noteworthy that each seeding rate is characterized by a certain amount of elementary fibers in the stems: stems from crops with the seeding rate of 0.1–0.6 million pieces / ha have the smallest number of primary and secondary fibers. The largest cells of primary and secondary fibers are found in the stems from crops with the seeding rate of 0.1–0.6 million pieces / ha, the smallest - due to the seeding rate of 1.8–2.7 million pieces / ha. Consequently, the size of both primary and secondary fibers decreases when the seeding rate is increased. The data of the research conclusively prove that the size of the inner lumen of the elementary fibers decreases both lengthwise and edgewise when the seeding rate is increased. Stems that are grown on the plots with the seeding rate of 1.8 -2.7 million pieces / ha have a thick bast-fibered layer (530.5–636.4 μm) with the largest amount of primary and secondary fibers (6918, 4-8302.6 cm) of a regular multi-faceted shape with a small internal lumen lengthwise and edgewise (2.9–4.2 μm and 2.2–2.7 μm).