Breeding peculiarities of the manifestation of hemp fiberness signs
Abstract
Aim. To establish the genetic features of the manifestation of signs of fibrousness and yield of stems, depending on growing conditions and harvesting periods. Methods. New methods were applied: "Method of evaluation of hemp plants for the presence of cannabinoids", "Method of evaluation of individual plants of monoecious hemp varieties by fiber content at the beginning of flowering", "Method of creation of hybrid breeding material of monoecious hemp". Results. It was established that the main conditions for obtaining the maximum amount of fiber and its quality indicators are the use of the late-ripening variety Hlukhivski 51, sowing with a feeding area of 15x5 cm, the diameter of the stems 6-8 mm, the sowing rate of 75 kg/ha (4.2 million pcs./ha) against the background of increased fertilization. Conclusions. The genetic features of the Hlukhivski 51 variety are high fibrousness and high yield of the stems, which are maximally manifested by observing the conditions of the feeding area of 15x5 cm, the sowing rate of 75 kg/ha (4.2 million pieces/ha) and the increased background of fertilization (N120P90K90). Expansion of the response of genotypes of late-ripening varieties to the level of dry biomass yield of 20 t/ha occurs with a feeding area of 50x5 and 50x10 cm and increased doses of N150P120K120 fertilizers. This can become the basis for the use of hemp for bioenergy purposes. When growing production crops for fiber in order to speed up harvesting, an important factor is the start of harvesting at an earlier time, and therefore we recommend growing two varieties of hemp: early-ripening (technical maturity occurs 2 weeks earlier than late-ripening varieties) and late-ripening varieties of hemp.
References
Virovets V. G., Sitnic V.P. Nutritional area and primary fiber content in the progeny of elite hemp plants. Flax and Hemp. 1979. No. 11. Р. 27–29. [in Ukrainian]
Vyrovets V. H., Laiko I. M., Shcherban I. I., Myhun M. P. Some aspects of selection to improve the quality of hemp fiber Can-nabis sativa L. Breeding and Seed Production. 1993. Vol. 74. P. 8–11. [in Ukrainian]
Laiko I. M., Vyrovets V. H. Anatomical structure of stems and the content of cannabinoids in hemp. Scientific Foundations of Agricultural Management of Ukraine in Modern Conditions : thesis. Chabany, 1994. Ch. 1. P. 29. [in Ukrainian]
Kryvosheeva L. M., Myhal M. D. Comparative study of the signs of fiber content and density of the fibrous layer in the stem of hemp. Biology, Cultivation, Harvesting and Primary Processing of Flax and Hemp: Coll. of Science Proceedings of the Institute of Bast Crops of the Ukrainian Academy of Sciences. 2004. Vol. 3. P. 60–67. [in Ukrainian]
Kryvosheeva L. M., Myhal M. D. Comparative anatomical study of different fiber varieties of hemp. Collection of Science Pro-ceedings of the Institute of Bast Cultures of the Ukrainian Academy of Sciences. 2009. Vol. 5. P. 27–41. [in Ukrainian]
Myhal M. D., Holiuk Yu. V. Study of stem size and hemp fiber content as components of productivity. Herald of Agrarian Science. 1999. No. 7. P. 41–44. [in Ukrainian]
Onupryenko L. H., Vyrovets V. H. Morpho-physiological features of modern high-fiber varieties of monoecious hemp. Collection of Scientific Works of the Institute of Bask Cultures of the Ukrainian Academy of Sciences. 2007. Vol. 4. P. 92–102. [in Ukrainian]
Vyrovets V. H., Laiko I. M., Onupriienko L. H. et al. Increasing the fiber content in the stems of seeded hemp (Cannabis sativa L.) as a result of targeted complex selection action. Breeding and Seed Production. 2008. Vol. 96. P. 195–204. [in Ukrainian]
Onupryenko L. H., Vyrovets V. H. Family-group selection as one of the decisive factors in increasing the fiber content of modern varieties of monoecious hemp. Innovative directions in Breeding, Genetics, Growing and Harvesting Technologies, Processing and standardization of Technical Crops: International Science and Technology Conference of Young Scientists. 2009. Sumy. P. 3–8. [in Ukrainian]
Onupryenko L. The influence of genotype of the variety and growing conditions of hemp stem traits during selection for fiber. Collection of Scientific Works of the Institute of Agriculture of the UAAS. 2007. Vol. 3–4. P. 146–150. [in Ukrainian]
Myhal M. D., Haliuk Yu. V. The technical length of the hemp stem is a sign of hereditary increase in plant productivity by fiber. Cytology and Genetics. 1998. Vol. 32 (3). P. 77–80. [in Ukrainian]
Vyrovets V. H., Zhuplatova L. M., Laiko I. M., Rezvykh N. I. Potential opportunities of new varieties of hemp in the supply of raw materials to the industry. Problems of the Light and Textile Industry of Ukraine. 2008. No. 1 (14). P. 70–79. [in Ukrainian]
Onupryenko L. H., Vyrovets V. H. Studying the degree of variation of the main selection characteristics of the stems of high-fiber varieties of hemp. Actual Problems of the Development of the Flax and Hemp Industries: Materials of the Scientific and Technical Conference. Sumy. P. 8–13. [in Ukrainian]
