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Item Relative field susceptibility of rice varieties to infestation by the rice leaf roller Cnaphalocrocis medinalis Guenee(Kerala Agricultural University, 1974) Das, N M; Nair, M R G KEighteen varieties of paddy were screened for their relative susceptibility to infestation by Cnaphalocrocismedinalis The cviposition response of the different varieties varied significantly. The varieties could be ranked in the following ascending order with reference to the extent of preference: Kochuvithu, TKM6, TKM1, Adt27, Ptb9, Pankaj, Triveni, 1' 1. Cavery, IR20, Aswathi, Karuna, Jagannath, Annapoorna, Rohini, Mashoori Jaya and iRH- Based on the extent of leaf damage caused by the larvae, Kochuvithu ranked as the least susceptible variety followed by TKM6, TKM1, Ptb9, Adt 27, Pankaj, Triveni, IR20, H4 Cavery, Aswathi, Karuna, Annapoorna and Jagannath there being no significant difference among themselves. IR8, Jaya, Rohini and Mashoori were most susceptible. Based on the extent of leaf damage caused by the larvae Kochuvithu ranked as the least susceptible variety followed by TKM6, TKM1, Ptb9, Adt 27, Pankaj, Triveni. IR20, H4, Cavery, Aswathi, Karuna, Annapoorna and Jagannath, there be ing no significant difference among themselves. Susceptibility of the riee varieties to damage by leaf roller in the field was positively correlated with the number of eggs laid on them.Item Phytoclimate of paddy(Kerala Agricultural University, 1983) Prasada Rao, G S L H VItem Preplanting treatment of paddy seedling(Kerala Agricultural University, 1983) Gopinathan, R; Sasidharan, N K; Pillai, P BItem Productivity of rice in relation to nitrogen management(Kerala Agricultural University, 1994) John, P S; Mercy George; Latha, AItem Effect of micronutrients on the uptake of N, P and K in rice(Kerala Agricultural University, 1994) Muralidharan, P; Jose, A IA field experiment was conducted to study the effect of application of secondary and micronutrients on the uptake of N, P and K by rice continuously for two seasons in 1991. The total N uptake was significantly enhanced by the application of B, Cu and Mo. Application of B had a consistent influence on the uptake of P and K also. Phosphorus and Zn interacted negatively in the soil influencing the uptake of each other by the crop and the decreased P uptake as result of application of Zn indirectly reduced the yield. Antagonism was observed between K and Mg.Item Genetic variability and correlation in short duration rice cultivars(Kerala Agricultural University, 1994) Ahmed Regina; Rema Bai, N; Devika, R; Joseph, C AIn order to understand the nature and extent of variability and association of various quantitative characters with grain yield, a field experiment was conducted with 45 short duration rice genotypes at the Rice Research Station, Moncompu. The environmental influence on the different traits was evident from the phenotypic coefficient of variability being higher than the genotypic coefficient of variability. Characters such as plant height, flag leaf area, panicle exsertion, number of grains per panicle and grain yield exhibited moderate to high heritability and genetic advance. Grain yield was found to be positively correlated both at genotypic and phenotypic level with number of productive tiller's per hill, plant height, flag leaf area, panicle length anil number of grains per panicle.Item Effect of water management and lime on iron toxicity and yield of paddy(Kerala Agricultural University, 1996) Durga Devi, K M; Gopi, C S; Santhakumari, G; Prahhakaran, P VA field experiment was conducted during rabi and summer seasons of 1991-92 in paddy fields of Chalakudy Command Area, in order to study the effect of a single top dressing of lime on iron toxicity and yield of paddy under different water management practices. Considerable reduction in Fe' * concentration could be noticed in soil as well as plant during the period of panicle initiation when lime was applied entirely as one top dressing (at 20 days after transplanting or 30 days after sowing). Application of lime 9 500 kg ha' as single top dressing resulted significantly higher grain and straw yields of paddy as compared to lime >8> 300 kg ha ', 900 kg ha ' and no lime application. The economic level of lime for getting maximum profit from grain and straw was 568 kg ha ' and 635 kg ha1 for the rabi and summer crops respectively.Item Effect of modified urea forms on the performance of wet-seeded rice in acid laterite soils(Kerala Agricultural University, 1996) Bridgit, T K; Jose mathew; Sivakumar, CField studies were conducted at the Regional Agricultural Research Station. Pattambi for three dry seasons during 1991 to 1993 tu evaluate the efficiency of modified urea forms in wet-seeded rice under puddled condition. The results indicated the remarkable response of wet-seeded rice to new urea forms over prilled urea in respect of growth, yield attributes and yield and N use efficiency. Split application on nimin coated urea (NCU) and inussorie rock phosphate coated urea (MRPU) recorded significant yield improvement over prilled urea (PU) and large granule urea (LGU) applied either fully as basal or in split doses.Item Effect of ammonium polyphosphate as a carrier for zinc in lowland rice(Kerala Agricultural University, 1997) Indira, M; Annie Koruth; Joseph, C A; Annie KoruthA field trial was conducted for four seasons to evaluate the efficacy of ammonium polyphosphatc (APP) for its sequestering effect of /me and to find out the optimum level of zinc for the rice crop. The results revealed the sequestering effect of APP to /.inc. Among the three levels of zinc application tried, 25 kg ZnSO4 per ha was found to be the optimum level of zinc for the rice crop.Item Nitrogen and carbohydrate status and their accumulation in the plant-parts of early rice culture, 24-20(Kerala Agricultural University, 1973) Kuriakose, T F; George, C M