A total number of 21 sorghum varieties was screened for stress resistance at the vegetative stage of the crop. The grain yield was less affected compared to nonstress. The cultivars viz., SPV 393, KS 7193, KS 6312 and TWC 120 were found to be drought tolerant after evaluating for most of the physiological characters and yield. The intercorrelation of ten characters showed that grain yield showed significantly positive correlation for number of closed stomata both in stress and nonstress condition. Highest non significant correlation was noticed for grain yield and leaf wilting/rolling. DMP/plant and stomata count under stress.
The range of variation for different characters indicated wide differences among the genotypes both in main and ratoon crop. The phenotypic and genotypic co-efficient of variation was high for stem girth, length of fourth internode, total soluble solids and green stalk yield in main crop. High heritability and high genetic advance as per cent of mean for plant height, stem girth, length of fourth internode, green stalk yield, juice yield and jaggery yield both in main and ratoon crop indicated the presence of additive genes for these characters. Non-additive gene action was predominant for number of internodes in both main and ratoon crop. Juice yield showed strong positive correlation with jaggery yield in both main and ratoon crops. The juice yield had high positive direct effect in both main and ratoon crops. Hence, selection for high juice yield might be effective in achieving higher jaggery yield in sweet sorghum.
Sixty hybrids of sorghum were evaluated in four environment and stability parameters were studied for panicle yield per panicle. The genotypes showed significiant differences interaction was significant for all the characters except 100 grain weight. The hybrids 205 A x MR 750, 56 A x TNS 79, 73 A x TNS 88, 26 A x MR 750 and 111 A x 881 could be recommended for wider cultivation since they recorded superior mean, stability and average responsiveness for yeild and yeild component characters
Sixty hybrids of sorghum were evaluated to know the magnitude and direction of association between yield and component traits during rabi and summer seasons of 1994 in four locations. Positive and significant association was noticed between grain yield and component traits except days to 50 per cent flowering and days to maturity. Improvement in grain yield in sorghum would be possible through selection for stem thickness, number of rachis per panicle and 100 grain weight.
A new cambodia cotton variety KC.2 combining moderate resistance to leaf hopper, high yield and suitable for cultivation in rainfed black soil tract of Tuticorin, Tirunelveli and Virudhunagar districts of Tamil Nadu during North-East Monsoon was released in January 1997. This cultivar was developed from a cross involving MCU.10, a black arm resistant variety and KC.1, a jassid resistant strain. It has an average seed cotton yield of 772 kg/ha under rainfed condition which is 18% increase over LRA. 5166 and 11% increase over MCU.10. It has got a good ginning outturn of 37.5% and fibre lenght of 24.4 mm. It comes under medium staple category. The variety KC.2 has a good CSP value of 2412 for nominal 40's count as against standard CSP value of 2040. It has got a high yielding potential of 23.65 q/ha under favourable conditions.
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