In 1966 IRRI released IR8, the first high-yielding modern rice cultivar for the tropical irrigated lowlands.
In the late 1960s and early 1970s, yields of 9 to 10 t ha−1 were often reported for IR8 under favorable irrigated conditions. Since then, IRRI has developed many high-yielding indica inbred cultivars such as IR36, IR64, and IR72 .
Maximum grain yield of these indica inbred cultivars was also recorded as high as 10 t ha−1 in the tropical irrigated lowlands.
This suggests that a yield plateau has been reached in the indica inbred breeding approach under tropical irrigated conditions.
To break the yield barrier founded in indica inbred varieties, development of hybrid rice was begun in the late 1970s and new plant type (NPT) rice in the late 1980s at IRRI.
In 1966 IRRI released IR8, the first high-yielding modern rice cultivar for the tropical irrigated lowlands. In the late 1960s and early 1970s, yields of 9 to 10 t ha−1 were often reported for IR8 under favorable irrigated conditions. Since then, IRRI has developed many high-yielding indica inbred cultivars such as IR36, IR64, and IR72 . Maximum grain yield of these indica inbred cultivars was also recorded as high as 10 t ha−1 in the tropical irrigated lowlands. This suggests that a yield plateau has been reached in the indica inbred breeding approach under tropical irrigated conditions.To break the yield barrier founded in indica inbred varieties, development of hybrid rice was begun in the late 1970s and new plant type (NPT) rice in the late 1980s at IRRI.
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