2. Institutional Publications
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Item Evaluation of groundnut for kharif uplands and summer rice fallows(Kerala Agricultural University, 1985) V Gopinathan Nair; Pushkaran, KA widely divergent collection of 93 groundnut varieties was screened to select the bestsuited variety for the kharif uplands and summer rice fallows. They were evaluated in preliminary trials in uplands as well as in rice fallows. The varieties exhibited wide diversity for important economic traits within and between seasons and many of them were far superior to the recommended varieties. Based on the performance in the preliminary trials, thirty one varieties including the recommended varieties (TMV 2 and TMV 7) were selected for comparative yield trials. They were tested in two seasons each in uplands and rice fallows. The varieties differed in yield and other economic traits in both seasons. The performance of the same variety, m general, varied from upland to rice fallows. TG 14 in uplands and TG 3 in rice fallows were the top ranking varieties. Spanish Improved was found to be a high yielder at both seasons. Five promising varieties were selected and they along with 3 standards were further tested in multi-locational trials at 5 locations in summer rice fallows and 6 locations in kharif uplands. The multi-locationa! trials further confirmed that TG 14 and TG 3 were the highest yielders in uplands and rice fallows respectively. Spanish Improved was also another high yielder at both seasons.Item Correlation and path analysis in groundnut in the summer rice fallows(Kerala Agricultural University, 1988) Pushkaran, K; Gopinathan Nair, VPod 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.Item Path analysis in groundnut(Kerala Agricultural University, 1989) Pushkaran, K; Gopinathan Nair, VEighty 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.