Wednesday, 9 November 2005
5

Overlay Patterns of Sorghum Grain Yield, Canopy Temperature, Greenbugs, Corn Leaf Aphid and Soil Water Content on Dryland.

Hong Li, William Payne, Jerry Michels, and Charles M. Rush. Texas A&M University, 2301 Experiment Station Rd., Bushland, TX 79012

Spatial overlay patterns of crop yield, canopy temperature, insects and soil water content may yield insights for site-specific management of grain sorghum (Sorghum bicolor (L.) Moench). A study of precision faming for dryland grain sorghum production was conducted in a Pullman clay loam on Texas High Plain during 2002-2004. The objective was to determine the spatial correlations of sorghum grain yield, canopy temperature, greenbugs, corn leaf aphid (CLA), maize dwarf mosaic virus (MDMV), soil water content (SWC) and texture in space and time for sorghum management against chronic drought and high temperature. Canopy temperature was detected 24 hours per day at a 10-minute interval using infrared thermocouple sensors at 18 sites along transect across the field. Monthly greenbugs, CLA, MDMV and SWC were determined at each site across the field. Sorghum grain yield was negatively correlated with canopy temperature, greenbugs, CLA, and MDMV (- 0.38 < r < - 0.75, P < 0.05), and positively correlated with SWC (r < 0.67, P < 0.01). The SWC was significantly correlated to clay and sand measured using laser diffraction technology (P < 0.01). Semivariogram analysis showed that these crop, soil, insect and disease variables were correlated in space within 30-42 meters. Sorghum grain yield, SWC and clay content were lower and canopy temperature and insect counts were higher in the east than in other areas in the field. Differences in site characteristics suggest the need for examining the spatial influences of SWC, texture and geographic features in the sorghum yield, insect, disease and canopy temperature overlay patterns.

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