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State-Space Description of Field Heterogeneity

Water and Nitrogen Use in Cotton

^a Texas A&M Univ., current address: Dept. of Soil Science, North Carolina State Univ., Raleigh, NC 27695
^b Texas A&M University–USDA-ARS, 3810 4th Street, Lubbock, TX 79415
^c Texas A&M University, 1509 Aggie Drive, Beaumont, TX 77713
^d Texas A&M Univ., Rt. 3, Box 219, Lubbock, TX 79403
^e Economics, Texas Tech University, Lubbock, TX 79409

View larger version (39K): [in a new window]   Fig. 1. Spatial pattern of soil water content (SWC) at different depths in the rooting zone (0–0.9 m) related to site elevation (SE) across (a and c) 50% evapotranspiration (ET) plots and (b and d) 75% ET plots, measured 24 June 1998.

View larger version (29K): [in a new window]   Fig. 2. Temporal patterns of soil water content (SWC) along soil profile at (a) 50% evapotranspiration (ET) and (b) 75% ET irrigation level measured in 1998.

View larger version (50K): [in a new window]   Fig. 3. Distribution of (a and b) lint yield at harvest, (c and d) total N uptake by cotton measured on 10 Sept. 1998, and (e and f) soil clay (0–0.3 m) and NO3-N (0–0.9 m) measured 1 July 1998 at 50 and 75% evapotranspiration, respectively.

View larger version (48K): [in a new window]   Fig. 4. Regression of lint yield as a function of (a and b)soil water content (SWC), (c) clay and (d) sand contents, and (e and f) site relative elevation (RE).

View larger version (46K): [in a new window]   Fig. 5. Cross-correlation function (xy) of (a, b, c, e, and f) cotton lint yield, (a) soil water content, (b, d) clay, (f) sand, and (c and e) elevation at a lag distance of ±180 m on the 50 and 75% evapotranspiration transects. Data were measured in all plots in 1998.

View larger version (55K): [in a new window]   Fig. 6. State-space cotton lint yield model at the (a) 50% ET and (b) 75% ET irrigation level in 1998 with i, location; Y, yield (kg ha-1); SWC, soil water (mm m-1); C, clay (g kg-1); S, sand (g kg-1); E, elevation (m); and , model noises.