Based on the conducted research, the influence of mineral fertilizers, drip irrigation, growth regulators, and harvest times on the polysaccharide content in Althaea officinalis L. raw material was determined. The study utilized field, laboratory, and computational methods. A trend was observed where increasing the dose of mineral fertilizers resulted in higher polysaccharide content in the dry raw material.
Drip irrigation slightly reduced the polysaccharide content in the grass and leaves of A. officinalis but increased their content in the roots. When examining the effect of foliar application of growth regulators on the total polysaccharide content in A. officinalis raw material, it was found that growth regulators can either increase or decrease the content of biologically active substances compared to the control.
The highest polysaccharide content in the grass and leaves was obtained with the application of N120P120K120, and in the roots with N180P180K180. Among the studied growth regulators, Potassium Humate and Sodium Humate were found to be the most effective. The optimal time for harvesting the aerial parts of A.
officinalis to achieve the highest polysaccharide content is during the flowering phase, where the dry grass collected in this phase contained 9.11% polysaccharides, the leaves contained 11.21%, and the stems contained 6.18%. To obtain high-quality A. officinalis raw material, timely preventive measures against the pathogen Puccinia malvacearum Mont and the spread of the pest Podagrica fuscicornis L.