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ThesisItem Open Access Comparative studies on the fixation of nitrogen by certain common legumes(Division of Agronomy, Agricultural college & reseach institute Vellayani, Trivandrum, 1963) Rose, H L; KAU; Madhavan Nair, KThesisItem Open Access Studies on the fractionation of soil phosphorus and the absorption and retention of ammonium nitrogen in Kerala soils(Division of agricultural Chemistry, Agricultural College & Research institute Vellayani, Trivandrum, 1963) Narayanan Nambiar, P K; KAU; Money, N SA study was undertaken with the object of finding o u t t h e retention of ammonium nitrogen in different soils of Kerala when applied in the form of ammonium sulphate and leached after one day or one week contact. Eight soils differing in texture were taken and treated with ammonium sulphate solution of three different concentrations, viz., 52.50, 10500 and 21000 ,ug.N/lOO g. of soil under the laboratory conditions. The unadsorbed nitrogen was found out by estimating nitrogen in the supernatent liquid. The ammonium nitrogen retained by the soil was estimated after leaching the soil with known volume of water. The statistical evaluation of the relation between the textural separates and the ammonium nitrogen retained was also made.ThesisItem Open Access Studies on the nodal infection of red rot of sugarcane(Faculty of the Post Graduate School, Indian Agricultural Research Institute, New Delhi, 1963) Wilson, K I; KAU; Chona, B LThe reaction of 6 sugarcane varieties to red rot infection through the nodal region caused by Colletotrichum falcatum Went was studied. Cane varieties Co. 445, Co. 331, Co. 312 and Co. 1181 were found to be susceptible while Co.1070 and Co. 286 proved to be moderately resistant to nodal infection. The fungus persited in an incipient form in the nodal regions of apparently healthy stalks of sugarcane. A number of leaf - sheaths also yielded the fungus on isolation. The leaf - sheath water (the water accumulated in the cavity between the leaf-sheath and stalk) collected from the above 6 varieties of sugarcane stimulated the spore germination of the fungus. The presence of sugars viz., sucrose and laevalose, detected in the leaf sheath water by paper chromatographic analysis, is believed to be responsible for the stimulation of spore germination.ThesisItem Open Access Review of the insect pests of pulsecrops and studies on the biology of the pea leaf roller Nacoleia vulgalis Guence (Pyralidae)(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1963) Mammen, K V; KAU; Joseph, K VLiterature on the insect pests of the important pilse crops, with special reference to the work done in India has been reviewed. The biology and bionomics of the pea leaf roller Nacoleia vulgalis Gn. (Pyralidae) have been worked out in detail. The moths mate a day after emergence. The female moth lays creamy yellow, oval, scale like eggs during night in rows, generally on tender leaves . On an average , about 542 eggs are laid by one female. Incubation period is 4 days. Larval period lasts 13 to 15 days, the larva undergoing five instars. Durations of the different instars are 3 to 4 , 2 to 3, 2 to 3, 2 to 3 and 4 to 6 days respectively. The first instar caterpillars nibble and feed on the green matter on the undersurface at the base of the leaves and the later stage caterpillars web the leaves together and feed from inside skeletonising the leaves.ThesisItem Open Access Studies on the influence of host and induced superparasitism on the pupal parasite Trichospilus pupivora Ferriere (Eulophidae)(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1963) Jayarathnam, K; KAU; Joseph, K VThe literature on the effect of host on parasites and that on Trichospilus pupivora has been reviewed. The total number of adults produced, sex ratio, developmental period, longevity and size of T. pupivora were accertained when bred on eight different speciesof host pupae, namely (1) Phytometra peponis (2) Prodenia litura, (3)Orthaga exvinacea, (4) Sylepta derogata, (5) Lampides boeticus, (6) Margaronia indica, (7) Nephantis serinopa, and (8) Gracillaria soyella. Correlation and regression studies show that there exist, a highly significant and positive linear correlation between the weight of the host pupa on the one hand and the number of parasites emerged, the proportion of females , the developmental period and the size of the parasites emerged, the proportion of females, the developmental period and the size of the parasites on the other. There does not appear to be any correlation between longevity of parasites and weight of host pupa.ThesisItem Open Access Studies on the effect of growth regulators on germination, growth and oil content in Sesame (Sesamum indicum-L)(Division of Agricultural Botany, Agricultural College & Research Institute, Vellayani, 1963) Santha Kumari, S; KAU; Kumara Pillai, PAn experiment was conducted at the Agricultural College and Research Institute, Vellayani during 1962-63, to study the effect of three growth regulators NAA, GA and 2, 4-D on germination, growth and oil content of Sesamum indicum. NAA, GA and 2, 4-D at three different levels 0, 15, 30; 0, 25, 50; and 0, 2, 5 ppm. respectively, were tried for the present study . The three different stages of application were seed, seedling and at the time of flowering . The experiment was conducted as pot-culture in randomised block design with 5 replications and 27 treatment in factorial combinations. Observations on germination percentage, height of plants, number of branches and nodes, fresh weight of stem, number of flowers and fruits, percentage of fruit setting, yield and oil contents of seeds were recorded and the data statistically analysed.ThesisItem Open Access Influence of salinity on the germination and growth characteristics of rice(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1963) Remani, B; KAU; Money, N SA study was made of the influence of salinity on the germination, growth and yield of different varieties of rice. Germination was studied in the laboratory for five varieties using nine salts at different concentrations. Growth and yield characteristics were observed for two varieties in a pot culture experiment by flooding the soil with sea water for twenty four hours at different stages in the growth period of the plants. The percentage germination was reduced in all the varieties with increase in the concentration of the salt. For the same concentration the adverse effects of salts on germination increased in the order ammonium chloride ammonium sulphate < sodium chloride < sodium sulphate < potassium chloride < potassium sulphate < magnesium sulphate < calcium chloride. Chlorides were generally more toxic than sulphates. Among the cations, ammonium and potassium were the least toxic, sodium and magnesium were more so, while calcium was the most injurious.ThesisItem Open Access Effect of irrigation frequencies and mulches on the yield of summer cholam (Sorghum vulgare Pers.)(Regional Post Graduate Training Centre, Agricultural College and Research Institute, Coimbatore, 1963) Abraham Jacob, T; KAU; Mariakulandai, AAn experiment was conducted to find out the relative efficiency of three different moisture regimes, due to irrigation frequencies, at seven, fourteen and twenty one days, and three types of mulching viz., dust, trash and polythene mulches. The modifying effect of the mulches on soil conditions and crop growth was studied, to assess whether irrigation requirements could be reduced without deterioration in yield. The moisture regime had significantly increased the height of plants and length of earheads, while it had no influence on other yield attributes. Length of earhead, breadth of earhead and diameter of peduncle were significantly increased by the mulches.ThesisItem Open Access Studies on the effect of growth regulators in Amaranthus (Amaranthus gangeticus, L.)(Division of Agricultural Botany, Agricultural College and Research Institute, Vellayani, 1963) Philip Zachariah, K; KAU; Kumarapillai, PThe present work was undertaken to study the effects of gibberellic acid, indole acetic acid and indole butyric acid on the vegetable crop, amaranthus (Amaranthus gangeticus L.). Three methods of treatment viz. seed treatment (soaking for 2 hours); seed treatment followed by one foliar spray on the 20th day, and two foliar sprays on 20th and 35th days were tried. All the hormones were used at concentrations of 10, 20 and 30 ppm. A pot culture experiment was conducted for the purpose, adopting a randomised block design.
