Evaluation of the impact of selected microbiological preparations on the development of the aboveground biomass of Trifolium pratense L. / Ocena wpływu wybranych preparatów mikrobiologicznych na kształtowanie się biomasy nadziemnej Trifolium pratense L.

In order to determine the impact of improved microbiological preparations of soil on the development of the aboveground biomass of red clover (Parade variety) in the 2012-2013 year, field experiment with cultivation of this species was conducted. Experiment factors were three preparations containing composition of soil microorganisms (trade name: UGmax, Humus Active and Ekoużyźniacz). All study objects were carried out in triplicate. The analysed features were: green and dry matter of plant (kg • m^-2), plant height (cm), number of shoots (unit • m^-2), share of leaves and stems in biomass (%). The plants were cut three times, and collections of fresh weight were carried out at the beginning of flowering, i.e. when in 30-50% of the plants from plots the flower buds bloomed. The results were statistically analysed using analysis of variance. The study shows that the effects of biopreparations were dependent on the type of preparation and cut. Also, the meteorological conditions during the growing season of each research year were highly significant. The highest values of the analysed parameters were obtained for the plants that were sprayed using aqueous solutions of UGmax and Humus Active. There were no clear effects of soil fertilisers on the biomass structure expressed as the percentage of leaves and stems