Mummigatti, U VBhajantri, Chandrashekar M2019-07-192019-07-192004No. of references 98http://krishikosh.egranth.ac.in/handle/1/5810115521"A field experiment was conducted at MARS, UAS, Dhanvad during kharif 2002 to asses the physiological, biophysical and biochemical basis of yield difference in mesta genotypes under this non-traditional area. The experiment consisted of 11 genotypes of two species of mesta (Hibiscus sabdariffa and H. cannabinus) with three replications laidout in RBD. The crop was raised with recommended agronomic practices. The periodical observations were recorded. The correlation study of these parameters with fibre yield was also made. Genotypes showed significant differences in their morphological parameters. The genotypes AS-73 CP-560, HS-2, AMV-4 and AMV-3 recorded significantly higher plant height, number of leaves, number of branches and basal stem diameter and these parameters showed significant positive correlation with fibre yield. The dry matter accumulation in leaves increased upto 120 DAS and decreased thereafter, while dry matter accumulation in stem, reproductive parts and TDMP increased till harvest and these parameters were found significantly higher in AS-73 CP-560 followed by HS-2, AMV-4 and AMV-3. These genotypes also recorded significantly higher LA, LAI, LAD, CGR and NAR. All above parameters except NAR showed significant and positive correlation with fibre yield. The biophysical parameters viz., RWC (%), LIR (%) and number of stomata on both abaxial and adaxial surfaces recorded significantly higher values in AS-73 CP-560 followed by HS-2, AMV-4 and AMV-3. These parameters showed significant and positive correlation with fibre yield. Biochemical parameters viz., leaf chlorophyll, phenols, tannins and sugars content were significantly higher in AS-73 CP-560, HS-2, AMV-4 and AMV-3 genotypes and these parameters showed significant and negative correlation with fibre yield except chlorophyll at harvest. The genotypes AS-73 CP-560, HS-2, AMV-4 and AMV-3 recorded significantly higher fibre yield, stalk yield, fibre equivalent yield, fibre recovery (%) and days to 50% flowering, while seed yield and 1000-seed weights were significantly lower compared to others. All above yield components recorded positive correlation with fibre yield except seed yield. It is concluded from the present study that the genotypes AS-73 CP-560 (13.67 q/ha), HS-2 (13.34 q/ha), AMV-4 (12.90 q/ha) and AMV-3 (12.39 q/ha) are high fibre yielding genotypes and HC-583 (7.55 q/ha), AMC-108 (7.23 q/ha) and AMV-2 (7.27 q/ha) are high seed yielding genotypes. The phenotypic characters viz., plant height and stem dry matter are significantly and positively associated with fibre yield while seed yield is significantly and negatively associated with fibre yield. There is a potential for yield improvement in both fibre and seed yield on need basis in these mesta genotypes."ennullThesis