Ecological studies on the site potentialities, nutrient status and yield of tea (Camellia sinensis l.) III: NPK and caffeine contents in BT-1 twig tissues [of Bangladesh]

azote bangladesh caffeine camellia sinensis crop yield dard ecologia vegetal estado nutricional fosforo nitrogen nutrition des plantes nutritional status phosphore phosphorus plant ecology plant nutrition potasio potassium ramo rendement des cultures rendimiento de cultivos spurs