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- W2247409610 abstract "Leaf area index (LAI) is an important component of maize simulation models. Although canopy development processes such as leaf appearance and expansion are well understood, there is lack of quantitative understanding of leaf senescence dynamics. This explains why leaf expansion is simulated at the individual leaf level while leaf senescence is modelled at the canopy level. The life cycle of individual maize leaves (i.e. from leaf tip appearance to physiological maturity) has been intensively measured in a fully irrigated field maize crop at Lincoln, Canterbury, New Zealand. A maximum LAI of approximately 4.5 was achieved at final leaf expansion. The thermal-time requirement for leaf appearance (phyllochron) was constant after the 4 th leaf position at 46 °Cd leaf -1 . Total leaf expansion, characterised by the appearance of leaf ligules, showed a bi-linear pattern at a rate of 65 °Cd leaf -1 until the 7 th leaf position and 26 °Cd leaf -1 after that. The rate of senescence onset was 135 °Cd leaf -1 until the 7 th leaf position and 25 °Cd leaf -1 after that. Finally, the rate of complete senescence was 115 °Cd leaf -1 until the 7 th leaf. This pattern of differential leaf expansion and senescence for individual leaf positions explained the progression of LAI senescence in two distinct phases. The first phase, from final leaf expansion until approximately the onset of senescence in the 7 th leaf, showed a slow rate of LAI decline with negligible changes in light interception. After that, LAI declined at approximately 0.08% per day causing a steep reduction in light interception. The relationships and parameterisation derived from this study can be used to improve the prediction of maize LAI by enabling both the simulation of leaf expansion and leaf senescence at the level of individual leaves. Additional keywords: corn, modelling, LAI, phyllochron, senescence" @default.
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- W2247409610 date "2011-01-01" @default.
- W2247409610 modified "2023-09-24" @default.
- W2247409610 title "A framework for quantifying maize leaf expansion and senescence at the individual leaf level." @default.
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