Abstract
Field experiment was conducted during the year 2000-2001 to study the effect of resource constraints, i.e., nutrient and moisture on the growth performance of Pinus roxburghii. Maximum height increment (0.72 m), CAI (8915.00 cm3) and biomass (26.67 kg tree-1) was obtained when all the inputs (fertilizer, mulch and irrigation) were applied in combination. The highest nutrient uptake and available nutrient uptake were recorded with the addition of all inputs. The amount of available nutrients decreased with the increase in the soil depth. Correlation co-efficients were established between growth parameters and available nutrients. The study indicates that plant growth parameters were positively and significantly correlated with available N, P and Ca in surface and sub-surface soil layers. The sub-surface soils have higher correlation values which indicate that this layer is an important factor governing the supply of nutrients and growth performance of tree species.
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