Coconut based cropping systems in the wet and wet intermediate zones : present constraints and prospects [Sri Lanka]

ananas comosus bananas banane banano cocos nucifera coffea commercialisation crop yield cultivo intercalado culture intercalaire curcuma domestica family labour income intercropping main d'oeuvre familiale mano de obra familiar marketing mercadeo piper nigrum production costs rendement des cultures rendimiento de cultivos renta revenu sri lanka zingiber officinale