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Season-Long Characterization of Vertical Distribution of Leaf Area in Corn

^a Dep. of Agric. and Biosyst. Eng., 124 Davidson Hall, Iowa State Univ., Ames, IA 50011
^b Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68588
^c Dep. of Agric. and Biosyst. Eng., 219B Davidson Hall, Iowa State Univ., Ames, IA 50011

View larger version (41K): [in a new window]   Fig. 1. Schematic diagram of the leaf-dissecting device used to accurately clip and collect corn leaves at 0.10-m height intervals.

View larger version (36K): [in a new window]   Fig. 2. Seasonal course of leaf area index (LAI) in corn fertilized with 0, 68, or 135 kg N ha-1 in (a) 1994 (data combined for irrigated and nonirrigated treatments) and (b) 1995 (data separate for irrigated and nonirrigated treatments).

View larger version (34K): [in a new window]   Fig. 3. Observed leaf area index LAI at 0.10-m height intervals (LAI0.10m), and fitted normal curves on six selected days in 1994 in corn fertilized with 0, 68, or 135 kg N ha-1. Data were combined for irrigated and nonirrigated treatments.

View larger version (33K): [in a new window]   Fig. 4. Observed leaf area index at 0.10-m height intervals (LAI0.10m), and fitted normal curves on six selected days in 1995 in irrigated corn fertilized with 0, 68, or 135 kg N ha-1.

View larger version (28K): [in a new window]   Fig. 5. Observed leaf area index at 0.10-m height intervals (LAI0.10m), and fitted normal curves on six selected days in 1995 in nonirrigated corn fertilized with 0, 68, or 135 kg N ha-1. Crop did not develop beyond the V14 stage because of severe drought.

View larger version (32K): [in a new window]   Fig. 6. Seasonal course of height of the symmetry axis (Xopt), leaf area index (LAI) in interval containing Xopt (Ymax), and measure of green-canopy spread (2) of the fitted normal curve in Fig. 3, 4, and 5. Ymax is maximum LAI per 0.10-m height interval, Xopt is midpoint of interval containing Ymax, and 2 is a measure of the spread of the curve.

View larger version (33K): [in a new window]   Fig. 7. Linear relationship between the three Gaussian heights (GS1, GS2, and GS3) and canopy height in corn fertilized with 0, 68, or 135 kg ha-1 in (a) 1994 and (b) 1995. GS1, GS2, and GS3 correspond to canopy levels above which 11, 50, and 89% of total LAI, respectively, is present.