INFLUENCE OF WEATHER CONDITIONS AND SOWING TIME ON YIELDING CAPACITY AND PROTEIN CONTENT IN SORGHUM GRAIN WHEN CULTIVATED ON DONBASS BLACK SOILS
The research objective is to study the efficiency of recommended and the most extended on Donbass grain sorghum hybrid Sprint W depending on sowing time and weather conditions during vegetation. Long-term field researches were conducted in the central part of Lugansk region on the experimental field of Lugansk national agrarian university during 2008-2017. According to the results the most effective sowing time for middle early grain sorghum hybrid Sprint W is the third decade of April. It provides maximum yielding capacity and output of crude protein with minimum grain humidity. It is shown that the yielding capacity of sorghum was the greatest in humidity favorable years and exceeded from 1,26-2,28 c/ha at the 1st term of sowing up to 0,16-3,68 c/ha at the 6th term of sowing (June 15). The greatest correlation with yielding capacity of sorghum grain was noticed depending on the sum of precipitation for July-August (r=0,64), territory moisture by hydrothermal index of G.T. Selyaninov for July-August (r=0,51) and hydrothermal index for May-September (r=0,51)