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The present paper summarizes on the seed germination and vigour index of the seedlings of Shorea robusta Gaertn.F under Bastar conditions of Chhattisgarh, India. The artificial regeneration of sal is difficult due to short viability period of seeds, higher root-shoot ratio and seedlings being moisture sensitive. The seeds of sal have always remained the subject of great interest for the forest researchers, tasar researchers, plantation managers and their associates as these seeds are categorized under recalcitrant seeds and possess a very short period of viability. The seeds attached with the sal tree were plucked and utilized for the present investigation as their viability was 95 to 100 per cent. The mean weight of single sal seed with the five wings was 2.2472g and without wings 1.9632g. The difference in the weight was 0.2736g as the five wings remain attached with the Sal seed for dispersal. The sal seeds without wings were more consistent and were used for sowing in a germination medium of sand under intermittent mist conditions of transparent polythene cover having the relative humidity 92.2 ± SE 0.73 per cent. The germination in sal started after 48h of sowing. The germination percentage in sal was 91.81±7.1668 with a vigour index of 3066.454 after 37 days of sowing. The root length of sal seedling ranged between 15.90±1.1144 cm. Similarly, the shoot length remained between 17.25±1.4380 cm. The root-shoot length ratio of sal seedlings remained 0.9169±0.1267 cm. The plants with higher proportion of roots can compete more effectively for soil nutrients from their medium of growth. Contrary to this, the seedlings with a higher proportion of shoots can capture more light energy. The root weight and shoot weight of sal seedlings were 0.5445±0.0955 g and 1.2586±0.1478 g, respectively with root-shoot weight ratio of 0.4321±0.0517, respectively. The normal root-shoot ratio could be an indication of healthier plant. Any change from the normal root-shoot weight ratio may alter the growth of the plants. Different factors associated with germination and vigour index were considered for analysis of variance. The amount of variation measured between the groups by Fisher’s ratio was significant. Analysis of covariance for fresh root length and shoot length, fresh root weight and shoot weight, root-shoot length ratio and root-shoot weight ratio in the seedlings of sal after 37 days of sowing adduced significant Fisher’s ratio of covariance. The multilinear regression with 02 to 06 predictor models for regression having different number of independent variables adduce influence on response variable and have been discussed to predict the value of Y based on multilinear regression model. The ‘t’ test for coefficients of intercept or constant, germination per cent, root length, shoot length, root-shoot length ratio, root weight, shoot weight keeping one response variable as root-shoot weight ratio under 02 to 06 predictor models have been discussed with the influences of different predictor variables on a response variable. The curling sal seeds directly plucked from the sal trees between 27th May to 4th June were found to have 95 to 100 per cent viability under abiotic and biotic associates of Jagdalpur, Chhattisgarh, India.
: Artificial regeneration, sal seeds, germination per cent, root-shoot ratio, variance, covariance, regression.
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