[en] Nine early maturing soybean mutant lines were tested for yield at Oitayam, Bogor. Results indicated that the lines No. 20 B/PsJ, and 147/PsJ were having yield potential comparable to control (Orba variety) and 3-5 days earlier in maturity. (author). 8 refs.; 3 tabs

[en] Reaction of some soybean mutant lines to natural rust fungus caused by (phakopsora pachyhizi syd). Eleven soybean mutant lines of orba variety derived from gamma fungus disease in the wet season 1985/86 at the experimental station of Citayam, Bogor. Based on IWGSR rating system, soybean mutant lines No 18/PsJ was moderately resistant to rust fungus disease. The other mutant lines, 14/PsJ, 15/PsJ, 20/PsJ, 102/PsJ, 106/PsJ, 111/PsJ, 118/PsJ, 119/PsJ and 220/PsJ were susceptible. (author). 4 figs.; 8 refs

[en] Fast neutrons, EMS and sodium azide are being used in an attempt to induce useful mutations in soybean. Short stature and early growing mutants were selected. A study is also undertaken to select for better symbiotic nitrogen fixation using ¹⁵N. (author)

[en] Studies on the adaptability of some soybean mutant lines at four locations. Eight soybean mutant lines and control (Orba variety) were tested for phenotypic, genotypic, environmental and adaptability values at four different locations during the dry season of 1985. According to Chang's formula, the mutant lines no. 63/PsJ, no. 71/PsJ, no. 82/PsJ, no. 91/PsJ, and no. 134/PsJ seem to have a high phenotypic value. While the other mutant no. 62/PsJ, no. 95/PsJ, no. 147/PsJ, and the orba variety seem to be low. All mutant lines and orba variety had the highest environmental value in polmas location but the lowest in the location of Bengkulu utara. The stability of genotypes were measured by Eberhard and Russel method. It was found that the mutant lines no. 62/PsJ, no. 91/PsJ, no. 95/PsJ, no. 147/PsJ, and orba variety could adapt better in infertile soil, while the others no. 63/PsJ, no. 71/PsJ, and no. 82/PsJ in fertile soil. The mutant lines no. 91/PsJ, no. 95/PsJ, no. 134/PsJ were relatively stable compared to the other mutants. (author). 5 refs

[en] This is a progress report of a project aiming at the genetic improvement of soybeans by induced mutations with regard to grain yield, shorter stature, earlier maturity and better nitrogen fixation. Promising mutants are under agronomic evaluation. Variation for nitrogen fixation has been found. (author)