Unproductive tiller dynamics and its effects on total biomass and grain yield in rice
1997
Zhong, X.H. | Laza, R.C. | Garcia, F.V. | Sanico, A.L. | Visperas, R.M. | Peng, S. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines). Agronomy, Plant Physiology and Agro-ecology Div.)
In a dry season experiment at the Philippine Rice Research Institute in 1994, the tiller production of IR72, IR64 and IR59682-132-1-1-2 were evaluated under six nitrogen treatments. Tillers were sorted into groups according to the number of leaves. Assuming that the smallest tillers were the first to die, the biomass and leaf area of unproductive tillers at different days after transplanting (DAT) were calculated. The results showed: (1) there were large numbers of unproductive tillers in all treatments the percentage of which was 25.6-60.8 percent, depending on cultivar and treatment. (2) The proportion of biomass and leaf area in unproductive tillers increased to 23.6 percent and 29.1 percent respectively at 33 DAT and then decreased linearly until harvest. (3) The relationships between stem number (independent variable) and biomass and leaf area were positively linear at 26 DAT and 39 DAT while parabolic at flowering. There was an optimum stem number for each cultivar to reach maximum biomass and leaf area at flowering. (4) The biomass and grain yield first increased as the number of unproductive tillers increased and then decreased later. Considering the large number of unproductive tillers and high proportion of biomass and leaf area in unproductive tillers, the contribution of unproductive tillers to grain yield should be quantified in future studies
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