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CROP ECOLOGY, MANAGEMENT & QUALITY-NOTES

Comparison of Three Methods for Estimating Leaf Area Index of Upland Rice Cultivars

^a The Graduate School of Natural Science and Technology, Okayama Univ., Okayama 700-8530, Japan
^b Africa Rice Center (WARDA), 01 BP 2031, Cotonou, Benin

^* Corresponding author (k.saito{at}cgiar.org).

Nondestructive estimation of leaf area index (LAI) using two canopy analyzers (LAI-2000 and SunScan) was compared with destructively measured LAI for four upland rice (Oryza spp.) cultivars with various types of canopy development during the period from 21 to 56 d after sowing (DAS). For the LAI-2000, LAI was estimated with or without the wide angle reading (Ring 5). When data from 50 and 56 DAS, which included LAI measured destructively of >4 m² m^–2, were omitted, the relationship of LAI measured destructively with LAI estimated by the SunScan was highly significant (R² = 0.96) and had lower root mean square error than that with LAI estimated by the LAI-2000 without Ring 5. We conclude that by restricting the range of LAI to <4 m² m^–2, the SanScan can provide reasonable estimates of LAI.

Abbreviations: DAS, days after sowing • LAI, leaf area index