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J. A. Thompson Ampan Bhromsiri Arawan Shutsrirung Srisook Lillakan 《Plant and Soil》1991,135(1):53-65
Over 1500 root-nodule bacteria were isolated from a range of uninoculated soybeans, and one cowpea, trap-hosts, sown in 1985 into traditional soybean-growing areas of soybean-growing areas of northern Thailand. Most isolates were slow-growing Bradyrhizobium japonicum. Using a modified bottle-jar technique, 586 of the isolates were tested with a range of soybean hosts and one cowpea host. The results indicated:
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| (a) | a very high level of infectiveness, with only one isolate failing to nodulate one host, and 95% forming \s>20 nodules per plant; |
| (b) | a high level of effectiveness of fixation of nitrogen by the local rhizobium populations with soybeans; |
| (c) | evidence of selection of effective strains by both soybean and cowpea hosts in the field; |
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