Cauvery Delta Zone Of Tamil Nadu Research Articles

Studies on growth attributes of Casuarina species in Cauvery delta zone of Tamil Nadu

Casuarina is one of the potential fast growing tree crops that grows largely in six districts of Cauvery delta zone (CDZ) of Tamil Nadu. In the present study, growth attribute pattern of Casuarina species was assessed in CDZ of Tamil Nadu. In CDZ, the growth attributes like tree height and diameter (6, 12, 18, 24, 30, 36 and 42 months after planting) with respect to varieties (Casuarina and its hybrid), spacing and districts were taken for the experiment. Split-split plot design was applied for analyzing the growth data for comparison of different parameters. Significant impact of factors like variety and spacing was found on the growth attributes of Casuarina hybrid 36 months after planting (MAP). Hence if farmers wanted to make harvesting at this stage, the 1.5 m spacing with Casuarina hybrid variety would be beneficial to them. The results concluded that 36-42 MAP was the right time for harvesting to get maximum benefits. Significant interaction of district vs variety vs spacing was found till 36 MAP for diameter and height. Significantly higher above ground biomass was recorded by Casuarina hybrid under spacing 1.5 m in Villupuram district (44.55 kg) which was followed by Casuarina hybrid under in Cuddalore district under the same spacing (40.55 kg).

Comparative Performance of RegCM Model Versions in Simulating Climate Change Projection Over Cauvery Delta Zone

RegCM is a Regional Climate Model (RCM), mostly applied in regional climate change and seasonal prediction around the world. The International Centre for Theoretical Physics improves this model and releases updated version over years. In the present study a comparison was made between RegCM3 and RegCM4 versions of this model in simulating climate change over Cauvery Delta Zone of Tamilnadu. The simulations were made using ECHAM5 global climate model outputs of A1B scenario with a resolution of 25 km from 1971 to 2100. The comparison of yearly and decadal means indicated that there exists a significant and positive difference in simulation of rainfall and relative humidity by RegCM4 while solar radiation, maximum temperature, minimum temperature and wind speed showed significant negative difference. The Seasonal and monthly comparisons revealed that difference across weather variables is not consistent as that of yearly and decadal. The decadal projections showed a marked increase in maximum temperature, minimum temperature and rainfall. A slight increase in relative humidity and a slight decline in solar radiation and wind speed were noticed under RegCM4 simulations. Keywords: RegCM3, RegCM4, Cauvery Delta Zone, A1B Scenario