2. Institutional Publications
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Item Relative efficiency of plots and blocks for field experiments in brinjal(Kerala Agricultural University, 1985) Jacob Thomas, M; George, K C; Hariharan, VFor field experiments with brinjal, taking the efficiency of the smallest plot as unity, RE values of various plots were computed. The efficiency was the highest for the smallest plot. There is a genera! decrease of block efficiency with increasing block size. More compact block of the same size shows higher efficiency. Blocks of identical size and shape, but consisting of long plots also show a some what higher efficiency than bloks with short plots of the same size. Arrangement of plots in more than one row decreased block efficiency and the effect is more pronounced with long plots. The number of replication required for a given level of accuracy decreased with an increase in plot size and increasing the number of replication rather than plot size was found more advantageous for a fixed experimental area.Item Optimum size and shape of plots for field experiments in brinjal(Kerala Agricultural University, 1986) Hariharan, V; Jacob Thomas, M; George, K CA uniformity trial in brinjal (Solatium melongena L). was conducted at main campus of the Kerala Agricultural University, Vellanikkara, during the third crop season, 1980. Observations on yield, number of fruits and primary branches were recorded. The variability among plots of different sizes and shapes was determined by calculating coefficient of variation (CV). It was observed that an increase in the plot size in either direction decreased the CV. But decrease was more rapid along N-S direction. Long and narrow plots showed lower CV than approximately square plots. The observed relation between plot sizes and variance was in conformity with Smith's variance law. At larger plot sizes the regression line showed a tendency to come down although negligible. The optimum plot size observed through smith's method and maximum curvature method was almost same. From the above consideration a plot size of 8.64 m2 (9.6 m X 0.9 m) was found to be most advisable for conducting most of the field experiments in brinjal.Item Balancing of first order residual effect through orthogonal latin squares(Kerala Agricultural University, 1986) Sathianandan, T V; George, K CA general method of construction of designs that are balanced for first order residual effects, when the number of treatments is prime or power of a prime number, using orthogonal latin squares has been given. The residual effects are more efficiently estimated in this type of designs and are useful in long term experiments like perennial crop experiments, feeding trials etc.Item Construction and analysis of a generalised confounded asymmetrical factorial design(Kerala Agricultural University, 1986) Santy George; George, K CThe present study deals with the construction and analysis of confounded asymmetrical factorial designs. The authors have attempted to give a general method of construction with the help of two lemmas. The general method of analysis suggested by the authors can be used for symmetrical as well as asymmetrical factorial designs. An easy method of obtaining the divisions of the contrast to obtain SS in ANOVA is also explained. This method has also been illustrated through a practical example.Item Optimum size and shape of plots under colocasia (Colocasia esculent A L.)(Kerala Agricultural University, 1987) Lizy, M J; George, K C; Jacob Thomas, MA uniformity trial on colocasia was conducted at the experimental field of the College of Agriculture, Vellayani, Kerala during April-September, 1984. At the time of harvest the observations regarding the yield characteristics were recorded. From the study of the size and shape of the plot it was found that an increase in plot size in either direction decreased the coefficient of variation. For a given size of the plot, the best shape was that having more number of rows than columns. The heterogeneity coefficient b in the Smith's equation for yield was 0.6057. The optimum plot size found out by maximum curvature method and by modified maximum curvature method was approximately 3 m2. When the cost of experimentation was considered, a plot size of 1.636 m2 was found optimum for conducting experiments with colocasia.Item Genetic divergence in culinary varieties of banana(Kerala Agricultural University, 1987) Mercy, K A; George, K CThirty culinary varieties of banana grown at the Banana Research Station, Kannara, Kerala were observed for 13 different morphological characters and the data were subjected to analysis of variance. Significant differences were recorded among all the varieties with regard to different morphological characters. By using D2 analysis the varieties were grouped into 12 clusters which were homogeneous within and heterogeneous between. The same clustering pattern was obtained in the canonical analysis except for the variety 'Ashmonthan'. This variety was in the first cluster through canonical analysis. The characters which were contributing maximum towards divergence were bunch weight and hand weight. The characters which were contributing minimum towards divergence were girth and height. The same results were obtained through both the methods.Item Comparison of different models for the determination of optimum plot size for colocasia (Colocasia esculenta L.)(Kerala Agricultural University, 1988) Lizy, M J; George, K C; Jocob Thomas, MItem Comparison of different statistical techniques for assessing soil heterogeneity(Kerala Agricultural University, 1988) Lizy, M J; George, K C; Jacob Thomas, MA uniformity trial on colocasia was conducted at the College of Agriculture, Vellayani, Kerala Agricultural University, during kharif 1984. Biometrical observations on 16 characters as indicated in Tables 1,2 and 3 were taken from all plants. The nature of soil heterogeneity was studied from the productivity contour map. The map revealed that the field could be considered heterogeneous in nature. Based on the mean square analysis, we could not predict any general trend of fertilty variation existing in the field. The low serial correlation coefficients established that fertile areas occur in patches. The'b' value was found higher for yield than for other characters. While comparing all the four methods we could assume that the method of serial correlation, is more reliable than all other methods.Item Comparative study of the contribution of biometric characters on yield in dessert varieties of banana(Kerala Agricultural University, 1984) Vijayaraghavakumar; George, K C; Krishnan Nair, NInvestigations of twelve morphological characters were carried out on the crop raised at the KAU Banana Research Farm, Kannara. Fifty six dessert varieties of banana plants were grown in randomised blocks of three replications. The analysis revealed that all the twelve characters showed high significant difference among the varieties. All the phenotypic and genotypic correlations of the characters) with yield were positive. From the path coefficient analysis the character having maximum contribution to yield is 'weight of hands'. The 'weight of fingers' and 'number of fingers' also influence the yield indirectly. The genetic advance through discriminant function was found to be less than that through straight selection. Chenkadali and Red banana were the best two varieties selected through the method of selection indices.Item Statistical analysis of the influence of biometric characters on yield in some culinary varieties of banana(Kerala Agricultural University, 1984) Vijayaraghavakumar; George, K C; Krishnan Nair, NThe plants were grown on a three replicated RBD with thirty culinary varieties of banana at the Banana Research Station (KAU) Kannara. Measurements ort thirteen morphological characters were taken for the study. These biometric characters had shown high significant difference among the varieties. All the significant phenotypic and genotypic correlations of the characters with yield were positive. From the path coefficient analysis, it was seen that the yield is influenced by the number of fingers and as the number of hands increases, the number of fingers per hand decreases. No significant gain in genetic advance was observed when the genetic advance through discriminant function was compared with that through straight selection. The analysis with restricted selection (to girth) indicated that the character, number of fingers, had the maximum genetic advance. The varieties Poykunnam and Walha were noted for their highest values of selection indices.