Chernega T. Efficiency of chemical protection of soydean crops against weeds in the Forest-Steppe of Ukraine.

The object - sowing weed content and soybean productivity in Forest-Steppe Region. The aim - proving and improving of chemical control measures of soybean crops against weeds species in Forest-Steppe Region that is aimed at its productivity and seed quality. The methods - field analytical, biochemical, statistical, calculation. The novelty - Under root and root-sprout types of weed content the usage of round-up herbicide in under-winter sail processing system, 36% water solution (4 liters per hectare) provides the destruction of perennial types on 75-91 % and Lontrel herbicide - 30 % water solution (0,5 l/h) provides destruction of root sprout weeds on 80-84 %. But the amount destruction of perennial weeds does not reduce a level of soybean pollution by annual species? But also empties phytocenosis holes for their expansion.The results of the research improve the technology of soybean protection from perennial and annual weed content, applying 10% W.S.C. (0.75 l/h) or galaxy top trunk mixture - 47.1 %W.S.C. with Poast substance, 20 % c.e. (2.0 + 2.01 l/h) providing weeds destruction on 75-96 % in 1-2 phase of crops present leaves.It was estimated the biological and agricultural efficiency of usage of tank mixture of frontier and pivot with 0.7-1.2 + 0.5-0.7 l/h expenditure and different ratio coefficient for weeding of soybean sowing during before-sprout period. It war also studied the after?effect on next crop changes. Field -agriculture.