The effect of plant population on the quality of sunflower seed for processing

Among other disadvantages, low hullability of sunflower seed results in oil cake with a high fibre and low protein content. Hullability is known to increase with increased seed size. Seed size generally decreases with an increase in plant density. The objective of this experiment was to determine the effect of plant density on hullability other physical trails and chemical seed composition of three sunflower cultivars. In a field trial at Potchefstroom the cultivars HV 3037, PAM 7392 and SNK 37 were planted in rows 0.9 m apart at densities of 20 000, 35 000 and 50 000 plants per ha in a randomised complete block, design with two replicates. Yield and seed trails differed among cultivars. Seed oil and protein content was not affected by plant population. Grain yield and hull content were significantly higher for the 20 000 than for the 35 000 and 50 000 populations. The thousand seed weight, a measure of seed size, decreased for all cultivars with increased plant population, The hullability of HV 3037 and ...