EN
Results from studies carried out in 1989-1997 were presented in this paper. Studies included the estimation of different technologies of grass sward renovation in post-boggy habitat effects on its yielding and species composition. Studies revealed that compared renovation technologies (manual seeding after rototiller application, overdrilling using special drill machines, new sowing after chemical ploughing) only slightly differentiated the grass yielding. Positive effect of sowing was most frequently observed during 1-2 years after its application. Effect of technologies on species composition of sward was much higher. It was modified due to rolotiller and manual sowing application, because the share of new species in fodder yield at the first year of performance reached up to 75%. Sown species had the lowest share in fodder yield on objects with overdrilling without defoliation application. The following species were of the highest share in the yield at the beginning of study: Lolium perenne and Trifolium genus (Trifolium pratense, Trifolium repens). Durability of species sown in communities was much reduced due to weather conditions (great temperature drops with no snow cover). Lolium perenne appeared to be the most sensitive to such unfavorable conditions.