Krailas Kiyothong, Chureerat Satjipanon, and Pimpaporn Pholsen

pp. 1163 - 1169

Abstract

The objective of this experiment was to investigate the effect of planting dates on seed yield and
quality of Stylosanthes guianensis CIAT 184 at Khon Kaen Animal Nutrition Research and Development
Center, during May 2003 to February 2004. A randomized complete block design with four replications was
used. Experimental treatments consisted of four planting dates spaced at about 30-day intervals from 23
May to 23 August 2003.
The results revealed that planting date had a significant effect on seed yields and pure germinable
seed yields (PGSY) of S. guianensis CIAT 184. Plots planted on 23 July produced the highest seed yield and
PGSY of 630 and 601 kg/ha, respectively followed by plots planted on 23 June and 23 May (514 and 501;
443 and 421 kg/ha, respectively). Plots planted on 23 August produced the lowest seed yield and PGSY of
269 and 262 kg/ha, respectively. There were no significant differences in seed purity percentage, germination percentage and 1000-seed weight among planting dates. Based on this research, it was concluded that lateJuly was the optimum planting date for S. guianensis CIAT 184 cultivation for seed production in Northeast
Thailand