Effect of water extracts and humates of weeds on seedlings development
The effects of water and alkaline extracts of aerial parts and roots of nettle, maple, thistle, goutweed, glague, angelica, orach, poisonous aconite grown on sod-podzolic well-cultivated soil were investigated. Further, the effect of the obtained filtrates on the cress seedlings development in 1 • 10 <sup>-5</sup>-1 • 10 <sup>-20</sup> dilution during 4 days, and the effects of these extracts on the development of roots of blackcurrant rooting during 60 days were evaluated. Similar studies have been carried out with potassium humate extraction of 1N KOH. The water-bath-dried extracts were analyzed by means of the infrared spectroscopy technique. It has been found that aqueous extracts of the studied plants have influenced on the cress roots to a greater extent and on its stems to a lesser extent. Root extracts have had more effect on roots, and the stalk extracts have had more effect on stalks. Aqueous infusions and alkaline extracts of weeds mainly act on the seedlings root development and on the stalks development to a lesser extent. The reduction in the solutions concentration from 10 <sup>-5</sup> to 10 <sup>-10</sup> has mainly decreased their catalytic ability. However, this difference has increased biological activity of various plants extracts. Alkaline extract compared with aqueous one stimulated the roots growth little more. The maximum physiological activity in cress seedlings was shown at concentrations of 10-5-10-10, and for aconite - up to 10 <sup>-20</sup>. Potassium humate of the studied plants was characterized by high physiological activity as to its effect on the roots. Alkaline extracts of thistle and glague had higher catalytic ability than aqueous extracts, and the opposing dependence was established for nettle. In the extracts obtained by IR- spectroscopy, there has been established the presence of carboxyl, methoxyl, quinone groups, their content being correlated with drugs biological activity. In this paper, we propose to use a parameter of variation of plants' response reactions on the impact to assess drugs biological activity