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Evaluation of the LAI-2000 Plant Canopy Analyzer to Estimate Leaf Area in Manually Defoliated Soybean

Virginia Polytechnic Inst. and State Univ., Tidewater Agric. Res. and Ext. Cent., 6321 Holland Rd., Suffolk, VA 23437

View larger version (11K): [in a new window]   Fig. 1. Placement of LAI-2000 fish-eye lens (with 45° opening, indicated by the white portion of the circle) for below-canopy measurements in soybean plots with (A) four rows with 0.46-m row centers and (B) five rows with 0.38-m row centers. Vertical lines represent row centers.

View larger version (21K): [in a new window]   Fig. 2. Spectral sensitivities of the LAI-2000 narrow- and wide-blue detectors (source: LI-COR, Lincoln, NE).

View larger version (18K): [in a new window]   Fig. 3. Placement of LAI-2000 fish-eye lens (with 45° opening) for below-canopy measurements in full-season soybean plots with 100% defoliation of four rows by 2 m plus an additional 1-m defoliated area at the ends of the two middle rows. All plants within the dashed lines were 100% defoliated; solid vertical lines represent 0.91-m row centers.

View larger version (23K): [in a new window]   Fig. 4. Placement of LAI-2000 fish-eye lens (with 45° opening) for below-canopy measurements in double-crop soybean plots with 100% defoliation of six rows by 2.28 m. All plants within the dashed lines were 100% defoliated; solid vertical lines represent 0.38-m row centers.

View larger version (81K): [in a new window]   Fig. 5. Plots of leaf area index (LAI) estimates using plant canopy analyzers with narrow- and wide-blue detectors. Detector types were compared using paired t tests. The dashed line is a reference assuming equality between the two detectors. The dotted lines are 95% confidence intervals. The solid line indicates the linear relationship between the detector types. Plot A was from 9 Aug. 1999; Plot B was from 6 Sept. 2000; Plots C to E were from 26 Sept. 2000. PCH 1326 had a wide-blue detector in 1999, which was changed to a narrow-blue detector in 2000.