2006 Volume 75 Issue 1 Pages 23-27
To establish the cultivation techniques that prevent the occurrence of seed-coat cracking (SCC) in soybean cultivar ‘Sachiyutaka’ we investigated the effects of seading time and planting density on the occurrence of SCC in ‘Sachiyutaka’ The occurrence of SCC tended to increase as the sowing time was advanced; it was increased by sowing in June and decreased by sowing later than July 10. The occurrence of SCC was decreased by increasing the planting density. However, in late sowing on July 24, no significant difference in the occurrence of SCC was observed between the sparse and the dense planting. The occurrence of SCC negatively correlated with grain number per m2 and seed-stem ratio, but was not correlated with 100-grain weight and yield. We recommend to delay the sowing time and increase planting density to increase the seed-stem ratio and to keep a sufficient number of grains per m2 as a measure to prevent the occurrence of SCC in ‘Sachiyutaka’
