Influence of sowing and harvesting time on productivity and sowing qualities of spring oat sapsan seeds

In 2015-2017 under conditions of Kirov region studies with spring covered oat Sapsan bred in FARC North-East were conducted. The scheme of the first field experiment included four variants by sowing terms –the earliest one (at physiological maturity of soil), and three following variants with 5-day intervals. The scheme of the second field experiment included four variants in harvesting terms – the early one (when grains in the upper half of the panicle are fully matured in 70% of plants), and three following variants with 5-day intervals. On the average during the years of studies the highest productivity was obtained at the second term of sowing – 3.03 t/ha. Indicators of germination energy and germination of seeds harvested in 2015-2017 were decreasing from the first sowing term to the last one. The highest percent of germination and germination energy was in seeds harvested in 2017 – 98.6 and 96.5% respectively; the lowest in 2016 – 92.8 and 90.8%. In 2015-2017 the most significant increase in productivity was noted in the second variant of the harvesting term. From 10 to 15 days delay with harvesting lead to the decrease of yield structure parameters. The best indicators of structure elements were in plants of the second term of harvesting. The study revealed a tendency to decrease in test weight and 1000-grain mass at delay with harvesting for 10 and 15 days as compared with the first term; the most significant decrease – in grain at the second harvesting term (488 g/l and 39.4 g respectively). The research defined a weak negative correlation between the protein content in grain and the amount of precipitations in interphase period "heading – wax ripening" (r = -0.28). On the average during the years of studies, the second sowing term was the most optimal (sowing 5 days after the earliest term). The optimal harvesting term is the second one, when 100% of plants reach the full grain maturity.

variety, sowing term, harvesting term, grain, test weight, 1000-grain mass, protein, germination energy, germination, yield structure elements

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