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Subject: search.filters.subject.Cowpea

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    Genetic improvement of cowpea, vigna unguiculata (L) walp seed yield
    (Kerala Agricultural University, 1979) Rajendran, R; Biswas, S R; Satyanarayana, A; Ramachander, P R; Anand, N; K Srinivasaim
    The heritability and inter-correlation study of Cowpea grown for seed purpose is reported. All characters examined were found to have high heritability. Selection index technique was found to be not efficient over straight selection. An ideal plant which gives higher seed yield should preferably flower early, have longer peduncles, have more peduncles and have more number of seeds per pod.
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    Persistence of some systemic insecticides in cowpea when applied as granules in different soil types of Kerala
    (Kerala Agricultural University, 1975) Das, N M; Dale, D; Sasidharan Pillai, K
    A pot trial was conducted to study the persistent toxicity of phorate, car. bofuran, mephosfolan and disulfoton to the pea aphid, Aphis craccivota on cowpea grown in sandy, laterite, red, forest and black soils treated with the above insecticides as granule. The persistent toxicity was highest in plants treated with disulfoton in all types of soils. Mephosfolan was next best in sandy, red and forest soils whereas carbofuran was next to disulfoton in laterite and black soils. The yields obtained from treated plants were significantly higher than those of corresponding controls. But there was no direct correlation between the persistent toxicity of insecticides and the yield. The yield factor appears to be influenced by the impact of the insecticide on some soil factors favouring plant growth.
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    Performance of cowpea varieties under varying levels of phosphorus in red-loam soils
    (Kerala Agricultural University, 1976) Mohamed Kunju, U; Ramachandran Nair, V; Manikantan Nair, P; Sadanandan, N
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    Control of the insect pests affecting cowpea Vigna Sinensis
    (Kerala Agricultural University, 1977) Das, N M; Susamma Mathai; Christudas, S P
    In a field experiment conducted in the red soil of Agricultural College Farm, Vellayani applying thimet, disulfotan, rnephosfolan and carbofuron granules at three different levels, applied at the' time of sowing, disulfoton at 1 kgai/ha was found an effective and economic method for controlling pea aphid upto 5 weeks after sowing. In another field experiment it was observed that spraying of different insecticides commencing from the time of flowering along with one application of disulfotan granules at the rate of 1 kg ai/ha at the time of sowing reduced the incidence of pea aphid and pod borers and increased the yield significantly. On a benefit cost ratio basis the effective insecticides could be ranked as follows: f enithion >f enitrothion > monocrotophos > carbaryl > phosalone > quinalphos.
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    Genetic variability for some quantitative traits in cowpea
    (Kerala Agricultural University, 1978) Sharan, P Angadi; Subramani, A; Kulkarni, R S
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    Effect of granular insecticides on nodulation, rhizosphere microflora and growth characteristics of cowpea
    (Kerala Agricultural University, 1978) Visalakshy, A; Santhakumari, K; George Koshy; Nair, M R G K
    Studies conducted to assess the effect of ten insecticide granules on nodulation, rhizosphere microflora and growth characteristics of cowpea showed that carbofuran, carbaryl and quinalphos increased the nodules significantly. An increase in size of nodules was also observed by all the insecticides except quinalphos. Carbofuran, carbaryl and chlorodimeiorm increased the plant height. Weight of roots was enhanced by carbofuran and MIPC. The fungal and bacterial population is influenced variously by the different insecticides both in the rhizosphere and non-rhizosphere soil, whereas the actinomycetes population was not affected.
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    Effect of levels of N, P & K on the uptake of nutrients and grain yield in cowpea
    (Kerala Agricultural University, 1979) Mohan Kumar; Balakrishna Pillai, B; Prabhakaran, P V
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    Genetic variability and correlations in cowpea Vigna Sinensis (L) savi
    (Kerala Agricultural University, 1979) Sreekumar, S G; Ramachandran Nair, Y; Saraswthy, P; Mary K George; Thomas, E J
    43 different genotypes of cowpea were grown in a Randomized block design with 2 replications during Khariff 1978. The different genetic parameters viz. coefficient of Phenotypic and genotypic variation, heritability in broad sense and genetic advance were calculated. The study revealed that all the characters showed positive phenotypic and genotypic correlations with yield. High heritability and genetic advance were noticed for 100 grain weight, yield of grain and yield of haulms. This indicate that selection based on the above characters will be very effective for the improvement of the crop.
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    Effect of phorate on growth characteristics and nitrogen contents of cowpea plants
    (Kerala Agricultural University, 1980) Visalakshi, A; Nair, M R G K
    Studies were made on the effect of phorale applied as granule with seeds treated/untreeted with Rhizobium on growth characterstics and total nitrogen contents of cowpea. In rhizobium treated plants, plant height and root length were significantly increased due to phorate treatment while the other factors such as fresh and dry weights of plants and TNC were increased only at 2 kg ai/ha level. In cowpea plants not treated with Rhizobium the height of the plant and TNC were significantly increased in general by phorate application.
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    Performance of fodder cowpea varieties at graded levels of phosphorus and potassium
    (Kerala Agricultural University, 1981) Nair, M S; Sreedevi, P; Nair, R V