| Sumario: | The purpose of this study is to define the range of adaptation of Stylosanthes guianensis CIAT 184, released in 1985 as cv. Pucallpa by IVITA (Instituto Veterinario de Investigaciónes Tropicales y de Altura) and INIPA (Instituto Nacional de Investigación y Promoción Agropecuaria) in Peru. Data from 32 RIEPT (International Network for Tropical Pastures Evaluation) type B trials conducted in the American humid tropics between Mexico and Bolivia were used for this study. The study shows that cv. Pucallpa is tolerant to anthracnose under a wide range of soil, climate and locations; the cultivar is better adapted to low altitudes (< 850 m.a.s.l.), on soils that are acid (pH < 5.0), which have low levels of organic matter (< 3.4%), are moderately sandy (18–56% sand), and which have rainfall accumulated in 12 weeks > 800 mm. At higher altitudes (> 1000 m.a.s.l.), the cultivar appears to respond to higher levels of organic matter.
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