[Determination of the requirements of heat unit of six "nuna" bean (Phaseolus vulgaris L.) collections]

calor chaleur climatic requirements crop yield ensayos de variedades environmental factors evaluation exigence climatique exigence des plantes facteur du milieu factores ambientales haricot commun heat kidney beans necesidades de las plantas peru phaseolus vulgaris plant requirements rendement des cultures rendimiento de cultivos variety trials