The effect of sowing rates and seed dressing on yield and yield components of naked and hulled oat

In 1997, first hulless cultivar Akt was taken into regional distribution in Poland, and in 2002 the next one Polar. Field experiments were conducted in Agricultural Experimental Station Lipnik near Stargard Szczecinski 2000- 2001. Two cultivars of oat (hulless Akt and hulled Bajka), 4 sowing rates (400, 530, 660, 790 seeds per m2), 3 variants of seed dressing at recommended rate (Sarfun T450 FS systematical-contact dressing with active substances karbendazym and tiuram, Dithane 455 SC - contact dressing with active substance mankozeb and control. Seed dressings were used. The increasing of sowing rate from 400 to 790 seeds per m2 in 2000 year caused significant increase of grain yield irrespective of cultivar. In the following year, when weather conditions were favorable for vegetation period, increasing sowing rates did not significantly influence grain yield. Grain yield of Bajka was higher than for hulless Akt. After taking hull in Bajka cultivar under consideration and subtracting it from the yield. Yields of both cultivars were similar, and significant differences were observed only in the first year of the experiment. Together with increasing sowing rate, also number of plants after germination and number of panicels per 1 m2 increased. Both cultivars reacted on increasing of plant density by reduction of grains in panicle Productive tillering in present experiment decrease together with sowing rate for both cultivars. Number of plants per m2 and number of panicles per m2 are significantly diversified for types only during the first year of the experiment. Weight of 1000 grains depends on agronomical and meteorological conditions. It did not change in 2000 at different sowing rate. Significant differences were observed in case of weight of 1000 grains in 2001, only. Seed dressings used in the experiment did not influence investigated features, except in hulless grains in 2000.

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