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1. Seed production of two-line rice hybrids is not much different from that of three line hybrids.
2. Most important consideration is to precisely determine the location or season which is ideal for inducing complete male sterility.
3. Currently the seed yields obtained in two-line hybrid seed production in China range from 2.3 to 3.0 t/ha which is comparable with seed yields obtained with three line hybrids
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual