EFFECT OF AGROCLIMATE ON SEED AND SEEDLING TRAITS OF TREE BEAN (Parkia timoriana (DC) Merr.) IN NORTH EAST INDIA
Indonesian Journal of Forestry Research
EFFECT OF AGROCLIMATE ON SEED AND SEEDLING TRAITS OF TREE BEAN (Parkia timoriana (DC) Merr.) IN NORTH EAST INDIA. Parkia timoriana (DC) Merr. (common name: tree bean) is a legum tree species found distributed in several South-East Asian countries including Indonesia, Japan, Malayasia, Phillippines, Thailand and Vietnam including the mid and foothills of eastern Himalayas. It was identified seed sources and grouped them into different agro climatic zones based on moisture index and
... x and precipitation. The resultant agroclimatic zones were analyzed for significant influences on quantitative traits of seeds and seedlings of P. timoriana and their contribution to germination and growth. Analysis of variance showed significant variation (p<0.05) in all seeds and pod traits of P. timoriana between agroclimatic zones. Polynomial regression showed a gradual increase in pod length, pod weight, seed weight per pod, seed number per pod and 1000 seed weight from the perhumid zone to arid zone. Zonal variations on seed germination and seedling vigour was in the order of arid > humid > sub-humid > perhumid. It was recommended that tree breeders should choose P. timoriana from the arid zone (MI = -20 to -60) for establishing seed orchard for optimum yield. Further, the ARCGIS interpolation tool could be used to predict better seed sources of this species in plantation programmes.