Experimento com variedades de soja do Programa de Colaboração INPA-INTSOY, realizado na várzea da ilha da Paciência, rio Solimões, 1976-1977This work was done in collaboration with the US based international Soy Program (INTSOY). Planting was done late in the varzea cultivation season. Even though this type of experiment is not favorably accepted by the produces, it is good for plant selection. Since the genotypes are under adverse conditions, the most resistant ones will be the ones selected and used in a crop betterment program. "Hill", a newly introduced variety, produced 1,265 Kgs of high quality seed per hectare in 7.5 days, and was found resistent to disease. "Manaus-1" (an INPA strain) produced the best harvest at 2,217 Kgs/Ha, followed by "Jupiter" with 1,373 Kgs/Ha. Both of these strains should be planted earlier under more favorable conditions.