~ 2357 ~ International Journal of Chemical Studies 2020; 8(3): 2357-2360 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2020; 8(3): 2357-2360 © 2020 IJCS Received: 16-03-2020 Accepted: 18-04-2020 S Pazhanisamy Ph.D. Research Scholar, Department of Agronomy, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar, India AL Narayanan Professor, Department of Agronomy, Pandit Jawaharlal Nehru College of Agriculture and Research Institute Karaikal, Union Territory of Puducherry, India V Sridevi Assistant Professor, Department of Agronomy, Pandit Jawaharlal Nehru College of Agriculture and Research Institute Karaikal, Union Territory of Puducherry, India Rodda Chandana Devi Ph.D. Research Scholar Department of Soil Science, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar, India Corresponding Author: S Pazhanisamy Ph.D. Research Scholar, Department of Agronomy, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar, India Correlation regression studies between different weather parameters and yield of aerobic rice S Pazhanisamy, AL Narayanan , V Sridevi and Rodda Chandana Devi DOI: https://doi.org/10.22271/chemi.2020.v8.i3ah.9564 Abstract A field experiment was conducted during Navarai season from February to June, 2017 at Agronomy farm of Pandit Jawaharlal Nehru College of Agriculture and Research Institute Karaikal, India, to study the correlation and regression between weather parameters and yield of aerobic rice under coastal region. The treatment consisted of three different date of sowing by weekly interval (February 6 th , February 13 th and February 20 th ) with five different seed priming practices. The treatments were evaluated in factorial concept of RBD with three replication. The results indicated that with respect to date of sowing, seeds sown on 6 th February produced significantly the highest grain yield (2591.5 kg ha -1 ). Correlation and regression studies showed that the direct weather parameters and agrometeorological indices had significant effect on grain yield. From the study proved that the sowing window February 6 th to be more effective for realizing higher productivity during Navarai season under aerobic rice cultivation at the coastal deltaic region. Keywords: Aerobic rice, agrometeorological indices, correlation; regression, date of sowing and direct weather parameters 1. Introduction Rice is the major stable food of over half of the world population (Dileep et al., 2018) [6] . This is unique among the major cereals by virtue of its extent and adaptability to wider range of edaphic, climatic and cultural conditions. Considered the abiotic stresses, weather plays the dominant role in influencing the growth and yield of rice (Islam et al., 2018) [10] . India has the largest rice area with 43.79 million hectares, it stands second after China with respect to production (116.42 million tonnes) and an average productivity of 25.78 q/ha -1 (Directorate of Economics & Statistics, Ministry of agriculture, 2019). In India rice crop is largely dependent on monsoonal rains. Rice consumes 30 per cent of all fresh water used worldwide and 80% in India (Pazhanisamy et al., 2020) [13] . The productivity of Asian irrigated rice system is increasingly threatened by water scarcity. Tuong and Bouman (2003) [20] estimated that by 2025, 2 million ha of Asian irrigated dry season rice and 13 million ha of its irrigated wet season rice may experience “physical water scarcity”. Which the regions facing water scarcity, the aerobic rice system is proving to be a promising technology by reducing water use (Bouman et al., 2007) [3] . Aerobic rice is refers to growing rice in condition of non-flooded and non-puddled low land soil with supplemental irrigation. Aerobic rice recorded substantial water savings by minimizing seepage, percolation and greatly reduced evaporation (Bouman et al., 2005) [4] . Aerobic rice generally requires 30 to 50 per cent less water even though, it resulted in a yield penalty of 20 to 30 per cent (Yang et al., 2005) [22] . Rice production in the tropics is sensitive to weather which affects the crop in various ways during different stages of its growth and certain stages are more sensitive to weather than others (Wassmann et al., 2009) [21] . The potential productivity of the aerobic rice could be positively changed by altering the sowing window in tune with favorable weather conditions (Bhuvanaswri, 2015) [22] . Hence by keeping these views in mind an experiment was conducted to study the crop weather relationships on yield of aerobic rice under coastal region. 2. Methodology A field experiment was conducted at Agronomy farm at Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal, Puducherry, India during Navarai season