DURATION OF CERTAIN PHENOLOGICAL PHASES OF DIFFERENT CORN HYBRIDS DEPENDING ON THE SOWING DATE

Abstract

The trial was set up in 2014 in the area of Leskovac, on alluvial soil. During the research period, the duration of individual phenological phases and the entire vegetation period of individual maize hybrids was monitored. As plant material, 6 maize hybrids were used, three FAO ripening groups (400-600). The goal of the research was to determine the duration of certain phenological phases, as well as the entire vegetation of certain hybrid maize, based on the number of days, the sum of the total, and the sum of the effective temperatures. During the investigated period, in all three sowing dates, the difference in vegetation length between the hybrid with the longest and the hybrid with the shortest vegetation period was 32 days, while the difference was determined in SUT 591.3 ºC and SET 200 ºC. The hybrid ZP 434 (FAO 400) had the shortest average vegetation period in all three sowing dates in 2014, and the hybrid NS 6030 (FAO 600) had the longest vegetation period. Observed by hybrids and sowing dates, all hybrids had the shortest vegetation period on the first sowing date, and the longest on the third sowing date. As the most reliable method for determining the length of vegetation of individual maize hybrids, the method of the sum of effective temperatures stood out, and the least accurate method is based on the number of days.