Summary
Thirteen varieties of soy bean, which were used in a varzea experiment along with two newly — introduced varieties, "Pickett 71" and "Calland". were planted on 30/06/76 on a terra firme farm (Fazenda Araca, Km 4 of the Manaus-Porto Velho Highway BR-319). The forest had been cut 8 years prior. Seed production was low due to late planting. It was briefly discus the possible causes of low productivity and recommendations make for better evaluation of terra firme soy bean plantations. "Hampton 266" was the best yielding variety in this experiment with 563 Kgs per hectare, while "Jupiter" (which produced 4,588 Kgs per hectare in the varzea) only yielded 400 Kgs. Soy bean planting in terra firme has to be adjusted with a harvest time in the dry season.