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Index levels of the process of pulping wheat straw (WS), industrial hemp stalks (HS), and Miscanthus x giganteus (MS) using the nitric acid-alkali (NA-A) method (HNO3/KOH and HNO3/NH4OH two-stage sequential delignification systems) were determined. The research showed, as a rule, a lower total yield of NA-A pulps than kraft pulps from WS, HS, and MS, and a lower level of the tensile index and tear resistance compared to the properties of soda-AQ and kraft pulps presented in other studies, as well as the author’s own studies. Additionally, the levels of nitrogen (in different forms) and potassium in the combined post-pulping filtrate were determined. Their levels were found to be higher than in the fertilizer solution used to fertilize tomato crops grown on soilless substrates in greenhouses. However, application of filtrates from pulping of nonwoody plant straw using NA-A method requires determining the effectiveness of this type of fertilizer solution, its impact on the horticulture and agriculture plants, and the properties of their output including grains, tubers, and fruits.

Index levels of the process of pulping wheat straw (WS), industrial hemp stalks (HS), and Miscanthus x giganteus (MS) using the nitric acid-alkali (NA--A) method (HNO3/KOH and HNO3/NH4OH two-stage sequential delignification systems) were determined. The research showed, as a rule, a lower total yield of NA--A pulps than kraft pulps from WS, HS, and MS, and a lower level of the tensile index and tear resistance compared to the properties of soda-AQ and kraft pulps presented in other studies, as well as the author's own studies. Additionally, the levels of nitrogen (in different forms) and potassium in the combined post-pulping filtrate were determined. Their levels were found to be higher than in the fertilizer solution used to fertilize tomato crops grown on soilless substrates in greenhouses. However, application of filtrates from pulping of nonwoody plant straw using NA-A method requires determining the effectiveness of this type of fertilizer solution, its impact on the horticulture and agriculture plants, and the properties of their output including grains, tubers, and fruits. [ABSTRACT FROM AUTHOR]

Shortage of wood raw material and the considerable amounts of agricultural waste and residues are one of the main environmental challenges today, which justify the relevance of studying the possibilities of utilization of non-wood lignocellulosic raw materials in production of wood-based composites. This article presents the study on the impact of including different non-wood lignocellulosic raw materials in the composition of MDF on their exploitation properties. Three types of non-wood lignocellulosic raw materials - maize stalks, industrial hemp stalks and thin bamboo stalks - were used for the purpose of the study. The materials were refined in laboratory conditions using defibrator disc mill. The panels were manufactured by using industrial wood-fibre mass and variation of non-wood raw materials from 10 to 40%. The main exploitation properties of MDF were determined and analysis on the possibilities of including the studied lignocellulosic raw materials in the composition of the panels was made. [ABSTRACT FROM AUTHOR]