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Author: search.filters.author.Gopinathan Nair, VSubject: search.filters.subject.groundnut

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    Correlation and path analysis in groundnut in the summer rice fallows
    (Kerala Agricultural University, 1988) Pushkaran, K; Gopinathan Nair, V
    Pod yield and seventean other characters were studied in eighty groundnut varieties raised in summer rice fallows. Correlation coefficients at the genotypic and phenotypic levels were computed between these characters and path analysis for pod yield was carried out considering eight components. Dry pod yield was highly correlated positively with plant height on the 50th day, length of top, fresh weight of pods, number of mature pods and number of immature pods both at the genotypic and phenotyic levels. Pod yield was also correlated highly and positively with number of flowers and haulms yield phenotypically. Pod yield recorded highly significant negative correlation with duration upto flowering, number of branches and leaves on the 50th day and number of flowers while it was moderate with number of branches. Positive correlation of duration upto flowering and maturity and lack of significant correlation of the latter with pod yield suggest the possibility of recombining high yield with short duration. Fresh weight of pods had the highest positive direct effect on dry pod yield. Number of leaves, flowers and mature pods also had positive direct effects in that order. Number of mature pods exarted positive indirect effects via fresh weight of pods, number of basal primary branches, haulms yield and 100 pod weight. Length of top, numbar of basal primary branches, haulms yield and '00 pod weight had negative direct effects on pod yield, of which that by haulms yield was the highest.
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    Gamma ray induced economic mutations in groundnut
    (Kerala Agricultural University, 1988) Gigi K John; Sreekumar, S G; Gopinathan Nair, V
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    Path analysis in groundnut
    (Kerala Agricultural University, 1989) Pushkaran, K; Gopinathan Nair, V
    Eighty groundnut varieties were raised in a randomised block design with three replications in upland during kharif. Pod yield and 17 characters were studied. Correlation coefficients at the genotypic and phenotypic levels were computed between pod yield and other characters and among themselves. Path analysis for dry pod yield was done considering eight important component characters. Dry pod yield was highly correlated positively with fresh weight of pods, haulms yield, number of mature pods, number of immature pods, duration upto maturity and 100 pod weight at the genotypic level. Negative significant correlation was seen for pod yield with plant height at the 50th day, height of main shoot and length of top. Fresh weight of pods had the highest positive direct effect followed by 100 pod weight, haulms yield and number of mature pods whereas length of top, number of flowers, number of basal primary branches and number of leaves exerted negative direct effect to dry pod yield in that order.