[Etudes sur les périodes critiques de compétition des mauvaises herbes avec les ignames (D. rotundata Poir) et (C. alata)]

Field experiments were conducted at Corozal and Isabela, Puerto Rico and Guapiles, Costa Rica to determine the critical periods of weed competition in yams (Dioscorea rotundata Poir and Dioscorea alata). The experiments were carried out under high input agriculture where the crop was fertilized, staked, and prevention practices for disease, insect and nematode control taken. At Corozal and Guapiles, the predominant weeds were grasses. At Isabela, grasses were among the most important weeds, but morninglory (Ipomoea tiliacea) was the predominant weed. The critical period in which weeds need to be controlled to avoid yield losses was found between 4 and 10 weeks for Costa Rica and between 8 and 10 weeks for Puerto Rico

Bibliographic Details

Main Authors:	52852 Calderón, G., 59336 Cortés, J., 112645 Rojas, C.E., 47424 Beale, A.J., 61806 Degras, L. ed., 11005 Institut National de la Recherche Agronomique, Paris (Francia), 7. Symposium of the International Society for Tropical Root Crops Gosier (Guadalupe) 1-6 Jul 1985
Format:	biblioteca
Published:	Paris (Francia) 1988
Subjects:	MALEZAS, DIOSCOREA ROTUNDATA, DIOSCOREA ALATA, COMPETENCIA BIOLOGICA, ESCARDA, COSTA RICA, PUERTO RICO,
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