Effect of climatic factors on seedling growth of local and exotic rice varieties

Abstract

The present study was conducted to determine the influence of climatic factors on seedling growth of local and exotic rice varieties of Namsai circle of Arunachal Pradesh. The effect of temperature, rainfall and humidity were recorded for local rice samples such as Sali, Khampti Lahi and exotic rice variety of Thailand Lahi. The observations with respect to growth of root length and shoot length were recorded along with the root fresh weight, root dry weight, shoot fresh weight and shoot dry weight were obtained from rice varieties. The raw data was analyzed with RBD from square root transformation. The mean temperature ranged from 30-34.14 oC, mean rainfall7.86-14.84 mm and mean humidity 77.29-80% were obtained among climatic factors. The study found the following findings, where the root length ranged from 29.71-67.86 cm. The lowest root length growth 29.71 cm was observed in Thailand Lahi variety with effect of 34.14 oC mean temperature, 8.14 mm mean rainfall and 77.43% mean humidity. The highest root length growth was seen in Sali variety by 67.86 cm with influence of 14.34 mm mean rainfall, 77.29% mean humidity and 30 oC mean temperature. The shoot length range 29.43-70.57 cm was recorded among rice varieties. The mean temperature 34.14 oC, mean rainfall 8.14 mm and mean humidity 77.43% were observed lowest shoot length growth 29.43 cm from Thailand lahi rice variety. The mean rainfall 7.86 mm, mean temperature 31.86 oC and mean humidity 80% were reported highest shoot length growth 70.57 cm from Khampti Lahi rice variety. The range of root fresh weight 0.10-0.53 gm, root dry weight 0.028-0.035 gm, shoot fresh weight 0.065-0.474 gm and shoot dry weight 0.041-0.070 gm were obtained among rice varieties. The highest root fresh weight 0.53 gm, root dry weight 0.035 gm, shoot fresh weight 0.065 gm and shoot dry weight 0.049 gm were observed from Sali variety with 30 oC with mean temperature. The climatic factor influences the seedling growth of rice but the rice variety adapts normal and adverse climatic factors and performs metabolism and growth into the plant system.