Growth Study Of Acacia Auriculiforms A-Cunn. (EX.Benth) Cassia Slamea Lam.And Dalbergia Sissoo Roxb. At Different Initial Spacings

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Birsa Agricultural University, Ranchi
A field experiment entitled Growth Study of Acaci auriculiformis A. Cunn. (ex. Benth.), " Cassia siamea Lam. and Dalbergia sissoo Roxb. at Different Initial Spacings", was started at Rarha research station of Faculty of Forestry, Kanke, Ranchi, in 1984 and various parameters recorded after 9 years (in 1993). The experiment was conducted in a Randomised Block Design with three spacing treatments, viz., 1.0m x 1.0m, 1.5m x 1.5m and 2.0m x 2.0m, each replicated thrice. The results revealed a remarkable improvement in soil properties such as organic carbon, available N, P and K. Soil pH did not show a significant change. A Significant decrease in survival per cent was found at the close spacing especially for D. sissoo, whereas C. siamea exhibited very high (more than 95%) survival at all the spacings. Mean girth and top girth increased. with increase in growing space. C. siamea attained minimum mean girth and D. sissoo the maximum. Whereas mean height also increased with increase in spacing, top height did not vary with the density of the crop. Trees of A. auriculiformis were generally taller than D. sissoo, but C. siamea trees were much shorter. Total basal area and volume per hectare decreased with decrease in stocking especially in case of A. auriculiformis and were significantly higher than that of C. siamea which in turn exceed D. sissoo.