EVALUATION OF GROWING DEGREE DAYS (GDD) VALUES OF EARLY, NORMAL AND LATE SOWING DATES IN DIFFERENT GENOTYPES OF RICE (Oryza sativa L.)

PALLAVI SRIVASTAVA¹*, RAKESH SIL SARMA², ALOK SHUKLA^3
1Department of Plant Physiology, College of Basic Sciences and Humanities, G.B.Pant University of Agriculture and Technology, Pantnagar, 263145, Uttarkhand, India
²Department of Plant Physiology, College of Basic Sciences and Humanities, G.B.Pant University of Agriculture and Technology, Pantnagar, 263145, Uttarkhand, India
³Department of Plant Physiology, College of Basic Sciences and Humanities, G.B.Pant University of Agriculture and Technology, Pantnagar, 263145, Uttarkhand, India
* Corresponding Author : srivastavapallavi52@gmail.com

Received : 29-03-2018     Accepted : 05-04-2018     Published : 15-04-2018
Volume : 10     Issue : 7       Pages : 5655 - 5659
Int J Agr Sci 10.7 (2018):5655-5659

Keywords : Growing degree days (GDD), Heat units, Calendar days, Thermal days
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to Directorate of Rice Research, Hyderabad and All India Coordinated Rice Improvement Project of ICAR for providing the necessary facilities and funding for carrying out the present work. Author also thankful to Indian Council of Agricultural Research, New Delhi for junior research fellowship during the research work.
Author Contribution : All author equally contributed

Rice is the most important food crop which feeds more than half of world population. Rice is not only major staple food crop but also has shaped the culture, diet and economy of thousands of millions of people all around the globe. A field experiment on rice (Oryzae sativa L.) taking three sowing dates viz.25th May, 2014, (Early sown) 12th June, 2014 (normal sown), 27th June, 2014 (Late sown) and fifteen rice genotypes namely IET20924, IET22569, IET22580, IET23275, IET23299, IET23300, IET23324, PHY1, PHY2, PHY3, LALAT, MTU1010, PR113, SASYASREE and IR64 were conducted at Norman E. Borolaug Crop Research Centre & Department of Plant Physiology, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Udham Singh Nagar (Uttarakhand) during kharifseason for the purpose to evaluate the heat efficiency of rice crop. Mostly the farmer’s use calendar days for prediction of plant growth and development and calendar days could be misleading for the prediction of crop growth for different crop management decisions as temperature varies widely from year to year. Growing degree days (GDD) are the simple and accurate method to predict that when a particular plant stage will occur. Growing degree days (GDD), sometimes also called thermal days, are a unit of measure describing the amount of accumulated heat through the growing season. From this study, we concluded that genotypes sown under early condition were given best results in term of yield parameters this is because early sown genotypes accumulated more number of growing degree days as compared to normal and late sown genotypes which is positively related to all yield attributes.

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