Stability of tillering of the new rice plant types under different population densities and nitrogen levels.
1994
Visperas R.M. | Sanico A. | Laza M.R.C. | Peng S.
A major effect has been initiated at IRRI [International Rice Research Inst., Los Banos, Laguna, Philippines] to develop a new plant type to break through the yield ceiling. The new plant type is characterized by large panicles, high spikelet number per panicle, regulated tillering habit, sturdy stems, dark green and erect leaves, and a growth duration of 110 to 120 days. These traits are needed to increase sink size and assimilate supply and to avoid losses from unproductive tillers. It is important to know how stable the tillering of the new plant types are under different population densities and nitrogen levels so that the plant breeders can have a selection range and the agronomists the bases for adjusting the N management for the new plant types. In 1993 WS [wet season], eight early-generation new plant type lines were evaluated and compared with IR72 for tillering stability at four spacings: 10 x 10, 15 x 15, 20 x 20, and 25 x 25 cm and two nitrogen levels: 60 and 100 kg N/ha. At 25 x 25 cm spacing, the high-tillering IR72 had three time more tillers than the low-tillering new plant types regardless of N levels. The low tillering habit of the new plant type was expressed across plant densities and N levels. In 1994 DS [dry season], other morphological traits and yield potential of new plant type lines were evaluated using both transplanted and direct-seeded crop establishment.
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