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Theses

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1962 - 196436
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Author: KAU × End date: 1964 × Start date: 1962 ×
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Now showing 1 - 9 of 36
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    ThesisItemOpen 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, K
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    ThesisItemOpen Access
    Studies on the effect of refrigeration on the deveolopment of Trichospilus pupivora ferriere (Eulophidae)
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1964) Narayanan, N J; KAU; Gopalakrishnan Nair, M R
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    ThesisItemOpen Access
    Studies on growth and bearing habits of certain varieties of bhendi (Abelmoschus esculentus (L.) Moench.)with special reference to fruit maturity and quality
    (Regional post-graduate training centre, Agricultural college and research institute, Coimbatore., 1964) Ravindra, K; KAU
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    ThesisItemOpen 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 S
    A 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.
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    ThesisItemOpen 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 L
    The 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.
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    ThesisItemOpen 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 V
    Literature 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.
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    ThesisItemOpen Access
    Studies on the susceptibility of the common caterpillar pests to infection by Bacillus thuringiensis Berliner
    (Division of Entomology, Agricultural College and Research Institute, Vellayani, 1964) Thomas, M J; KAU; Renga Ayyar, G
    Literature on Bacillus thurimgiensis Berlinerin relation to insect pest control has been reviewed. Susceptibility of twentysix diferent species of caterpillar pests, commonly occuring in Kerala, to infection by B. thuringiensis spores has been ascertained. Susceptibilityof seventeen of these caterpillars to the bacterium has been tested for the first time. In a screening experiment all the twentysix species of caterpillars have been infected by feeding them with food materials dipped in the spore suspension of B. thuringiensis containing 12.5 x 10 spores per 100 cc.
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    ThesisItemOpen Access
    Breeding behaviour of interspecific hybrids in the genus Arachis L.
    (Regional Post Graduate Training Centre, Agricultural College and Research Institute, Coimbatore, 1962) Gopinathan Nair, P; KAU; Ponnaiya, B W X
    The investigation aims at a comparative study of two kinds of F2 populations. The first one was derived from hybrids between two tetraploid parents, namely A-hypognea and A.sp (A.354) whose genomes are homologous. The second typeof tetraploids were derived from back cross hybrids between A-hypognea and allotriploid (resulting from the cross A-hypognea X A.sp. (A.329)). A comparative morphological and cytological analysis of these F2 populations have been made. Special techniques such as Hybrid index method and Polygraphic analysis were adopted and the variability expressed in the two F2populations have been eveluated. The possible causes for the occurrence of a skewed recombination in the straight F2 population have been suggested.
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    ThesisItemOpen 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 V
    The 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.