Abstract
The initial paper of this series (Jennings and de Jesus, Jr., 1968) reported a pronounced negative association between competitive ability in varietal mixtures and yield capacity in pure stands in distinct plant types of rice (Oryza sativa L.). Tall, leafy, spreading, tropical types were more competitive but yielded less than short-statured, small-leaved, erect, agronomically desirable types of temperate origin. This paper describes studies of the comparative competitive and yielding abilities of tall and dwarf segregates from a hybrid between the tall, leafy, lodging-susceptible Philippine variety, Peta, and the erect, Taiwanese indica dwarf, Taichung Native 1. Height in this hybrid is conditioned monogenically, with tallness being completely dominant to dwarfism (Aquino and Jennings, 1966). Derivatives of hybrids between Taichung Native 1 and Peta or other typical tropical varieties have yielded consistently between 5 and 9 ton/ha on experimental and farmers' fields in Southeast Asia (International Rice Research Institute, 1967).
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