Singh, Dhirendra KumarKannan, D.2017-11-082017-11-082016-10http://krishikosh.egranth.ac.in/handle/1/5810035088The present investigation was undertaken to study the stability analysis in cauliflower at Vegetable Research Centre (VRC) of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar with sixty diverse genotypes. The experiment was evaluated in Augmented Block Design (ABD) under four environmental conditions. Stability analysis was studied for twelve quantitative characters and thirteen qualitative characters. Data were analyzed statistically for stability analysis, effect of spacing and boron, genotypic, phenotypic coefficient of variation, heritability, genetic advance and correlation coefficient. Analysis of variance revealed among the sixty diverse genotypes, thirty genotypes performed stable (fifty percent) over the environments viz., PCF201, PCF202, PCF203, PCF205, PCF206, PCF207, PCF208, PCF215, PCF218, PCF227, PCF221, PCF223, PCF224, PCF225, PCF228, PCF232, PCF233, PCF235, PCF236, PCF237, PCF240, PCF241, PCF243, PCF245, PCF248, PCF250, PCF251, PCF252, PCF253 and PCF255 and eleven genotypes are PCF201, PCF202, PCF203, PCF205, PCF206, PCF218, PCF235, PCF240, PCF248, PCF251 and PCF255 showed most stable performance over the environments. The estimates of phenotypic coefficient of variation (PCV) showed high values in plant weight (g), leaf length, leaf breadth, curd weight, curd length, curd breadth, number of leaves, plant height, plant spread and petiole length. Estimates of genotypic coefficient of variation (GCV) showed high values for plant weight, curd weight, curd length, curd breadth, plant height, plant spread and petiole length. High heritability were observed for plant weight (g), leaf breadth, curd weight, curd length, curd breadth, number of leaves, plant height, plant spread and petiole length. While moderate level of heritability were observed for days to first curd formation, days to 50% maturity and leaf length. High level of genetic advance showed in plant weight, curd weight, plant height, and plant spread. Among the four environments comprising different spacing and boron concluded that E1 (60 x 50 cm without boron) gave early days to curd initiation and days to 50% curd maturity while E2 (60 x 50 cm with boron) gave best performance compare to other environments in curd weight, curd length and curd breadth but other two environments high density spacing E3 (50 x 40 cm without boron) and E4 (50 x 40 cm with boron) only favourable for vegetative characters. Correlation studies indicated that curd yield per hectare was significant and positively correlated with curd length, number of leaves, plant height, days to curd formation and days to 50% maturity and negative significantly correlated with curd breadth, petiole length and plant spread.enHorticultureThesis