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Author: search.filters.author.Pushkaran, K

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    Analysis of yield and its components in sweet potato (Ipomoea batatas L.)
    (Kerala Agricultural University, 1976) Pushkaran, K; Sukumaran Nair, P; Gopakumar, K
    Analysis was carried out for studying the yield-component inter-relationship in seventeen varieties of sweet potato. Determination of the coefficients of simple and mutual correlations and path at the levels of the first and second order components reveals that an increase in the length of vine causes significant increase in tuber yield. But at the same time, the overall area of leaf should not be allowed to increase, because this character bears a negative relationship with yield. An ideal plant type with longer vines, w i i i i small, narrow and deeply lobed leaves with appropriate orientation on the viue for effecting better photosynthetic efficiency, should be aimed at for selecting potentially high yielders.
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    Screening rice varieties for deep water situation through the study of seedling growth habit under submerged conditions
    (Kerala Agricultural University, 1981) Pushkaran, K; Balakrishna Rao, M J
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    Evaluation of groundnut for kharif uplands and summer rice fallows
    (Kerala Agricultural University, 1985) V Gopinathan Nair; Pushkaran, K
    A 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.
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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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    Viable mutations inducted by gamma rays in groundnut
    (Kerala Agricultural University, 1988) Pushkaran, K; Gopinathan Nair, V
    The effects of gamma radiation at three doses (20, 30 and 40 krad) were studied in three selected genotypes of groundnut viz., Spanish Improved, TG 14 and TMV 2 with the prime objective of evolving early mutants. Observations on seed germination, seedling survival, plant height, pollen fertility and other effects ware made. Chlorophyll mutation frequency, mutant spectrum, rnutagenic effectiveness and efficiency were worked out. Germination of seeds was reduced by gamma rays and a progressive decline in germination with increasing doses was noticed. The survival was also reduced in all the genotypes and the relationship between the percentage of survival and doses of radiations was inverse. A reduction in plant height was noticed in tha three genotypes on the 30th day. Pollen fertility deceased with increasing doses. The frequency of chlorophyll mutations increased with increasing doses of gamma rays in all the genotypes; the maximum baing for TG 14. Albina; xantha, chlorina and viridis were the chlorophyll mutants observed, of which viridis was seen the most frequent. No definite relationship was seen in any of the genotypes between doses of radiation and mutagenic effectiveness. In TMV 2 and Spanish Improved, effectiveness was the maximum at the highest dose of radiation tried (40 krad) while in TG 14, it was at tha intermediate dose (30 krad). Mutagenic efficiency, too, did not show ony specific relationship with the radiation doses in the g¬ypes. TMV 2 and TG 14 at 20 krad and Spanish Improved at 40 krad recorded the maximum mutagenic efficiency based on lethality. Based on injury and sterility, the highest efficiency was noted at 40 krad and 20 krad in TMV 2 and Spanish Improved respectively and both at 30 krad in TG 14. A wide range of viable mutants was isolated in the M3 generation affecting almost all the characters including early mutants of great practical utility. Macromutants with simultaneous change in a constellation of characters were isolated.
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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.
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    Effect of certain agronomic practices on the performance of kokkan affected nendran banana
    (Kerala Agricultural University, 1992) Nybe, E V; Pushkaran, K; Suma, A; Darley Jose
    The effects of certain agronomic practices on the performance of kokkan affected banana, cv. Nendran were studied at the Banana Research Station, Kannara during 1987. The results of the study revealed that the different agronomic practices such as application of K at double the recommended dose, MgSO4, fresh cowdung and neem cake snowed no significant improvement in kokkan affected plants with respect to yield, yield contributing characters and overall appearance of the bunch.
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    Genetic parameters for groundnut in summer rice fallows
    (Kerala Agricultural University, 1991) Pushkaran, K; Gopinathan Nair, V
    Genetic parameters for 15 metric characters in 80 divergent varieties of groundnut grown in the summer rice fallows were estimated. The varieties differed significantly in respect of all the characters. The pcv was higher than gcv for all the characters. High estimates of gcv, heritability and genetic advance were obtained for number of branches, flowers and leaves, spread of flowering and 100 pod weight whereas the values were low for fresh weight of pods and dry pod yield. So also the high pcv for dry pod yield suggests that the genetic improvement for the economic trait through selection for summer rice fallows is meagre. Oil content, shelling percentage and duration up to flowering and maturity registered high heritability, but low genetic advance.
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    Correlation studies in groundnut
    (Kerala Agricultural University, 1993) Pushkaran, K; Gopinathan Nair, V
    For effecting dependable selection in breeding groundnut varieties suited to kharif uplands and summer rice fallows, genotypic correlation studies and path analysis were done based on 18 characters collected from 80 divergent groundnut varieties and the results compared and contrasted. There are differences in the direction, degree of relationship and relative effects for important characters on the economic trait on both the situations. Hence, in selecting ideal genotypes for the two situations, differential considerations had to be given for the component characters.
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    Some successful crosses in pineapple
    (Kerala Agricultural University, 1994) Radha, T; Pushkaran, K; Jacob John, P