Abstract
The widespread adoption of high yielding, semidwarf, N-responsive rice (Oryza sativa L.) cultivars by California rice growers in the late 1970s raised questions about improved fertilizer use efficiency and reduced straw production of semidwarf rice cultivars under direct, water-seeded cultural systems. The objective of this study was to determine whether increased grain yields of semidwarf cultivars result from increased biological yield, improved partitioning (harvest index [HI]), improved N responsiveness (for example, improved fertility), or some combination of these factors. Twelve field experiments that included 12 cultivars were conducted from 1976 through 1985 at five locations, with preplant applied N rates ranging from 0 to 210 Ib/acre. No differences in biological yield were observed between tall and semidwarf cultivars across all N rates [...]
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