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Articles by R. Jagannathan
Total Records ( 3 ) for R. Jagannathan
  S. Kokilavani , R. Jagannathan , R. Selvaraju and N. Thavaprakaash
  A field experiment was conducted at eastern block of Tamil Nadu Agricultural University, Coimbatore during summer (Feb-May) 2005 to investigate the influence of morphological modification through terminal clipping in selected varieties of sesame with Factorial Randomized Block Design (FRBD) with three replications employing two factors viz., varieties (SVPR 1, TMV 3 and TMV 4) and morphological modification by terminal clipping (at 15, 25, 35, 45 days after sowing and no clipping). The results of the study indicated that terminal clipping done at 35 DAS found to improve the crop architecture, yield attributes and yield of the sesame variety SVPR 1. The variety TMV 4 was also considered as an appropriate alternative in recording equal growth and yield parameters and yield for the same clipping practice.
  O. Srivani , V. Geethalakshmi , R. Jagannathan , K. Bhuvaneswari and L. Guruswamy
  A study was conducted to evaluate the impact of future climate change on the productivity of major cereal crop, rice at different time periods of 21st century (2020, 2050 and 2080). Future changes in temperatures and precipitation for the years 2020, 2050 and 2080 were acquired from HADCM3 model run outputs and integrated with the base year (2000) data for creating weather files to run INFOCROP model in order to predict the yield of the study crops under changing environment. The rice variety chosen for simulation was IR 36 and different CO2 concentration levels viz., 376 ppm, 414 ppm, 522 ppm, 682 ppm were used in the INFOCROP model at different time periods (2000, 2020, 2050 and 2080) for assessing the impacts on crop productivity as projected in the IPCC (2001) report. The crop growth and productivity simulated for the future climate using INFOCROP model indicated that the crop duration, days to anthesis, LAI and DMP of rice crop steadily decreased from 2000 to 2020, 2050 and 2080 due to increase in temperature under enriched CO2 levels. The magnitude of decrease from 2050 to 2080 is expected to be more than that of from 2000 to 2020 and 2020 to 2050. Similarly model recorded the less number of grains per square meter over years. Hence the study reveals prominent negative effects of future climate change on rice crop which shows the necessity to alter the management practices suitable to it.
  N. Thavaprakaash , R. Jagannathan , K. Velayudham and L. Gurusamy
  Analytical study was carried out to study the influence of phenology and accumulated heat units of baby corn in different seasons. Baby corn crop was raised during late rabi 2002, kharif 2002, late rabi 2002-03 and summer 2003 seasons. The observations on days required for attainment of different phenophases viz., seedling, peak vegetative, tasseling, silking, first harvest and last harvest were recorded. Heat units such as Growing Degree Days (GDD), Photo Thermal Units (PTU), Helio Thermal Units (HTU), Relative Temperature Disparity (RTD), Heat Unit Efficiency (HUE), Photo Thermal Index (PTI) and Seasonal efficiency were worked for different seasons of baby corn. The yield obtained during four seasons of baby corn crop was related with the different heat units calculated during crop growth seasons. The results revealed that among the different indices GDD, HTU, PTU and RTD had negative relationship whereas HUE, PTI and Seasonal efficiency had positive relationship with yield of baby corn. Thus, the indices such as HUE, PTI and Seasonal efficiency are seem to be effective in taking into account and expressing the effect of varying ambient temperature on the duration between the phenological events for comparing the crop response to the ambient temperature between different phenological stages.
 
 
 
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