3.3. Botanical composition
The results of the botanical composition of the investigated grassland community are presented in Table 7. The percentage of empty space was similar among all treatments and ranged from 4.3 to 8.9%. The botanical composition was totally changed during the five years of the experiment. Four grass species disappeared: perennial ryegrass, timothy, Westerwolds ryegrass, and meadow fescue. These species were replaced by tall fescue. This effect can be explained by the lower precipitation during the summer periods of 2014 and 2015. Tall fescue is characterized by a thick and dense root system, which makes this species more resistant to soil water deficits. L. multiflorum Lam. showed the highest participation (17%) in the sward on the MCTR plot and lower on the WS and MS plots, at 9.1 and 8.4%, respectively. The application of biochar reduced the prevalence of L. multiflorum Lam. to below 2%. The soil amendments resulted in red clover percentage. The highest red clover content was observed on the CTR (8.4%). Any amendments applied resulted in definitely lower red clover participation and did not exceed 3.1%. Some new grass species appeared, i.e., Dactylis glomerataL. and Holcus lanatus L. D. glomerata L. was observed on all treated plots except the CTR. However, H. lanatus L. was noticed only on the CTR. The soil amendments resulted in forb content. During the five-year period, some forb species appear in the investigated grassland community, i.e., Capsella bursa-pastoris(L.) Medik., Geranium pusillum L., Melandrium pratenseRöhl., Ranunculus acris L., Rumex acetosa L.,Senecio vulgaris L. and Stellaria graminea L. Higher percentages of these species groups were noticed with the WS and MS treatment (Figure 5).