RATNA/ IR36

About RATNA/ IR36

RATNA Rice

• Type: High-yielding Indica rice variety

• Developed by: Central Rice Research Institute (CRRI), Cuttack, India

• Parentage: Derived from a cross involving T(N)1, Taichung Native 1, and Peta

• Introduced: In the 1960s during the Green Revolution

• Characteristics:

  • Semi-dwarf plant type

  • Matures in 125135 days

  • Resistant to major diseases like bacterial blight

  • High tillering capacity

  • Good grain quality (long slender grains)

• Suitable for: Irrigated and lowland ecosystems

IR36 Rice

• Type: High-yielding semi-dwarf Indica variety

• Developed by: International Rice Research Institute (IRRI), Philippines

• Parentage: A complex cross involving IR8, IR24, and other resistant lines

• Released: In 1976

• Characteristics:

  • Very early maturing (95110 days)

  • Highly resistant to pests like brown planthopper and diseases like blast

  • Semi-dwarf stature (lodging-resistant)

  • High yield potential

  • Fine grain quality with good cooking properties

• Global Impact: Became one of the most widely planted rice varieties globally in the late 1970s