PRODUCTIVITY OF JOINT SOWING OF MAIZE AND SORGHUM UNDER CONDITIONS OF THE WEST SIBERIAN FOREST STEPPE

Results are given from studies (2009–2011) on productivity of single-crop and joint sowing of maize and sorghum under conditions of the West Siberian forest steppe. The early-ripening maize hybrid Obskiy 140 SV, varieties of saccharine sorghum Volzhskoye 51 and grained sorghum Perspektivnoye 1 were assessed. There were revealed patterns of growth and development of plants depending on a seeding method, component ratio and harvesting time. Productivity of the sowings and protein richness of biomass were evaluated. It has been established that the joint growing of early-ripening maize hybrid Obskiy 140 SV and saccharine sorghum contributes to increasing the amount of digestible protein per fodder unit from 85 to 104 g, when they are harvested at their cob formation stage, and from 70 to 96 g at their milk stage, as compared with the single-crop sowing. The band sowing of maize hybrid Obskiy 140 SV and saccharine sorghum ensured the same productivity as the single-crop sowing of maize does, irrespective of harvesting time (403–407 centners of green mass per ha; 83.0–96.4 centners of dry mass per ha; 68.1–82.6 centners of forage units per ha, and 301–324 centners of silage per ha). As compared with the harvesting of crops at their cob formation stage, that at the milk stage contributed to increasing productivity of the single-crop and joint sowings of maize and saccharine sorghum (for dry mass: from 84.3 to 98.1, and from 83.0 to 96.4 centners per ha; for digestible protein from 579 to 613, and from 692 to 796 kg per ha; for silage: from 311 to 336, and from 301 to 324 centners per ha, respectively).The dry matter content of green mass increased from 19.9 to 23.9 percent.

maize, saccharine sorghum, grained sorghum, hybrid, single-crop sowing, through sowing, band sowing, green mass, dry mass, yield, productivity

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