Indian Journal of Agricultural Research
SCOPUSWeb of Science
  • Year: 2026
  • Volume: 59
  • Issue: 7

Optimizing Temperature and Drying Conditions to Break Dormancy in Thai RD79 Rice Seeds

  • Author:
  • Suwansa Chuchert1, Jedsada Thongmak1, Bunyisa Daungnamkaew1, Penpun Sudpesrot1, Wattana Na Nakorn1, Ketsarin Marnmad2, Thanet Khomphet3*
  • Total Page Count: 9
  • Page Number: 1051 to 1059

1Department of Agricultural Science, Faculty of Agriculture, Rajamangala University of Technology Srivijaya, Nakhon Si Thssammarat campus, Nakhon Si Thammarat, 80110, Thailand.

2Phatthalung Rice Seed Center, Phatthalung, 93000, Thailand.

3School of Agricultural Technology and Food Industry, Walailak University, Nakhon Si Thammarat, 80160, Thailand.

Corresponding Author: Thanet Khomphet, School of Agricultural Technology and Food Industry, Walailak University, Nakhon Si Thammarat, 80160, Thailand. Email: thanet.kh@mail.wu.ac.th

Abstract

Rice seed dormancy is a problem for farmers because it affects rapid, uniform seed germination and vigor during the early stages of crop growth resulting in reducing productivity. The objective of this study was to determine the optimum heating temperature and time for breaking seed dormancy of rice seed variety RD79.

The study was arranged as a factorial experiment in a completely randomixed design with 2 factors. The 1st factor was a heating temperature at 52 and 54°C and the 2nd factor was a heating date with 5, 6, 7, 8, 9 and 10 days.

The results found that rice seeds heated with different temperatures and times showed significant difference in germination percentage, soil emergence, mean germination time, shoot length, root length, dry weight and accelerated ageing. The correlation showed that the highest correlation coefficients were observed between germination percentage and soil emergence, accelerated ageing and mean germination time and accelerated ageing and soil emergence. The principal component analysis revealed that seeds heated at 54°C for 7, 8 and 9 days dominated in germination percentage, soil emergence and accelerated ageing. Hence, the suitable condition for breaking seed dormancy of RD79 is heating at 54°C for 7 days.

Keywords

Dry heat treatment, Hybrid rice, Oryza sativa, Seed dormancy