| Sumario: | In the tropical areas of southeastern Mexico the small-opaque black bean class is the most demanded by growers and consumers. In 2003 the line DOR 445 was released as a new cultivar named "Negro Grijalva". This cultivar is of early maturity, resistant to BGYMV and adapted to acid soils. From 1997-2000 Negro Grijalva was compared to cv. Negro INIFAP across fifteen year-site combinations in the state of Chiapas under residual moisture conditions; the yield of Negro Grijalva was 1 219 kg ha-1, 35.9% higher than that of Negro INIFAP. In a soil of pH 4.3 in central Chiapas, the yield of Negro Grijalva was similar to Negro INIFAP and with the addition of lime at a rate of 1.5 t ha-1, its yield increased by 20.8% vs 6.0% in Negro INIFAP. Therefore, Negro Grijalva can be used in acid soils with or without the addition of lime by low income farmers. Negro Grijalva has a seed weight of 23 g per 100 seeds.
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