Grain Yield Evaluation of a Soybean Variety: Chiang Mai 5

Abstract

Grain Yield of a soybean mutant line CM60-10kr-71 was evaluated under natural field condition of soybean rust (Phakopsora pachyrhizi Syd.) infection.  This information was used for supporting release of the line of soybean variety for recommendation to farmers. RCB design was used with three replications and four treatments of four soybean lines/varieties namely CM 60-10kr-71, MJ 9518-2, chiang Mai 60 and SJ 5.  The trials were conducted at Chiang Mai Field Crops Research Centre (CMFCRC) in the dry season and at the Royal Pangda Experiment Station inrainy season in 2006.  The results showed that the condition with low rust infection in dry season at CMFCRC had not affected their soybean yields.  but in alternative condition with cool temperature and high relative humidity which was favorable to rust infection at the Royal Pangda Experiment Station. lines CM 60-10kr-71 and MJ 9518-2 which had rust resistant genes gave more yield than those the other two check varieties.  The rust resistant line CM 60-10kr-71 was to be released as Chiang Mai 5 and recommended for the soybean growing areas in which rust had severely infected and sources of rust resistant genes for soybean breeding programs.