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Large-Area Maize Yield Forecasting Using Leaf Area Index Based Yield Model

^a Laboratorio Nacional de Modelaje y Sensores Remotos, INIFAP, km 32.5 Carr. Aguascalientes-Zacatecas, Ap. Postal 20 Pabellon de Arteaga, Aguascalientes 20660, Mexico
^b USDA-ARS, Grassl. Soil and Water Res. Lab., 808 East Blackland Rd., Temple, TX 76502, USA
^c Dep. of Plant and Soil Sci., Texas Tech Univ., 3810 4th St., Lubbock, TX 79415, USA
^d Campo Experimental de Valle del Fuerte, INIFAP, Carr. Internal. Mexico-Nogales, km 609 Ejido San Jose Rios, Guasave Sinaloa 81200, Mexico
^e Campo Experimental de Rio Bravo, INIFAP, km 61 Carr. Matamoros-Reynosa, Ap. Postal 172, Rio Bravo, Tamaulipas 88900, Mexico
^f Campo Experimental de Culiacan, INIFAP, Carr. Culiacan El Dorado, km 17.5 Culiacan, Sinaloa 80000, Mexico

View larger version (20K): [in a new window]   Fig. 1. Geographic location of the maize field areas monitored during the 2002–2003 autumn–winter growing season in Sinaloa, Mexico.

View larger version (13K): [in a new window]   Fig. 2. Relationship between ground-measured leaf are index (LAI) and normalized difference vegetation index (NDVI) for maize in irrigated areas of Sinaloa, Mexico, taken in 2001–2002. Note: Fifty-six observations were used, but only 31 points appear in the figure as some points had similar values.

View larger version (22K): [in a new window]   Fig. 3. Deviation of satellite-derived leaf area index of maize in relation to (A) ground-measured leaf area index and (B) maximum ground-measured leaf area index in sites located in the northern and central regions of Sinaloa, Mexico, during the 2002–2003 autumn–winter growing season. The envelope of acceptable precision is set at ±0.5 (optimum performance) and ±1.0 (threshold performance).