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Item Variability in selected varieties of cowpea Vigna unguiculata Walp(Kerala Agricultural University, 1980) Ramachandran, C; Peter, K V; Gopalakrishnan, P KItem Effect of lime, phosphorus and rhizobium inoculation on the growth and yield of cowpea(Kerala Agricultural University, 1982) Samuel Mathew; Koshy, M MAn experiment to study the effects of lime, phosphorus and rhizobium inoculation on the growth and yield of cowpea was conducted at the College of Agriculture, Vellayani during 1979. About 24^ increase in the yield of cowpea could be obtained by the application of lime at 300 kg/ha. Phosphorus application or seed inoculation with rhizobium culture did not produce any beneficial effect on the growth, nodulation or yield of cowpea under Vellayani conditions.Item Relative susceptibility of cowpea varieties to infestation by meloidogyne incognita(Kerala Agricultural University, 1988) Nirmala Mom, D; Sasi Kumar NairItem Growth and yield of cowpea as influenced by different methods and source of phosphorus applications(Kerala Agricultural University, 1984) Geethakumari, V L; Mohammed Kunju, UItem Efficient mutagenesis in cowpea(Kerala Agricultural University, 1984) Sunny K Oommen; Gopimony, RStudies were undertaken to obtain precise information on the effects of six doses of gamma rays (5 to 30 krad) and seven concentrations of ethyl methanesulphonate {0.1 to 0.7 per cent) on cowpea. Gamma ray and ethyl methanesulphonate treatments resulted in physiological damages in M, generation as evidenced by the reduction in survival of plants, plant growth and fertility. Mutation frequency estimated on M, plant basis increased with increasing doses of gamma rays and ethyl methanesulphonate. Effectiveness of gamma rays increased with increasing doses upto 15 krad and there was a reduction at still higher doses. Most efficient gamma ray dose was found to be 10 krad when efficiency was estimated on the basis of lethality or sterility, while on injury basis 30 krad was the most efficient dose. Among the different doses of ethyl methanesulphonate tried, 0.4 per cent was the most effective as well as efficient, irrespective of the criterion adopted for the estimation of efficiency.Item Effect of plant protection chemicals on bradyrhizobwm in cowpea (Vigna unguiculata (L) walp)(Kerala Agricultural University, 1996) Raji, P; Rajendran Filial, M VEffect of selected plant protection chemicals were tested on Bradyrhizobium both in the laboratory and in the field. The fungicides Thiram, Bordeaux mixture and Fytolan showed inhibition of the bacteria under in vitro conditions. These fungicides caused an initial reduction in rhizosphere population of Bradyrhizobium in the field. But later a gradual increase in the bacterial count was noticed. The fungicide Carbendazim and insecticides Carbofuran, Phorate and HCH showed no inhibition of Bradyrhizobium under laboratory and field conditions. Combinations of all the three insecticides with Thiram, Bordeaux mixture and Fytolan showed inhibition of the bacteria in in vitro. The rhizosphere bacterial population showed an initial reduction when these were applied in the soil.Item Cause-effect relationship of drought tolerant traits and grain yield in cowpea(Kerala Agricultural University, 1997) Magic Mereena; Sreekumar, S GSixteen grain cowpea varieties were evaluated in a replicated field experiment at the College of Agriculture, Vellayani, Trivandrum. Estimation of cause and effect relationship of seven drought tolerant traits and grain yield revealed that varieties with high harvest index, leaf area index at vegetative period and long grain filling period will produce high grain yield under conditions of drought.Item Combining ability analysis in cowpea (Vigna unguiculata [L| walp)(Kerala Agricultural University, 1998) Sobha, P P; Abdul Vahab, M; Krishnan, SCombining ability was studied in a 10 x 10 diallel cross in cowpea for nine important characters. The variance due to general combining ability and specific combining ability showed both additive and non-additive gene action for plant height, primary branches, days to flowering, pod length, pod weight, pods per plant, seeds per pod, 100 seed weight and yield per plant. Among ten parental lines, Arka Garima, VU-18, Selection 2-1, Section 263, Pusa Komal and Kanakamoni were good general combiners for most of the yield components. The hybrids VU-18 x Arka Garima and Selection 2-1 x VS 389 possessed high specific combining ability effects for yield per plant.