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Cropping Systems Research in the World's Driest Rainfed Wheat Region

^a Dep. of Crop and Soil Sci., Washington State Univ., Dryland Res. Stn., P.O. Box B, Lind, WA 99341
^b Dep. of Agric. and Resour. Econ., Washington State Univ., 101 Hulbert Hall, Pullman, WA 99164

View larger version (20K): [in a new window]   Fig. 1. Seed-zone soil water content in summer fallow in late August during three drought years.

View larger version (29K): [in a new window]   Fig. 2. Grain yield of winter wheat (WW) after summer fallow (one crop every 2 yr) compared with continuous annual no-till hard red spring wheat (HRSW) during 6 yr in the Horse Heaven Hills, Washington. = WW yield in 1997 is the average from several neighboring fields, not from replicated plots, and thus statistical analysis is not possible in 1997. = HRSW grain yield is from replicated plots during all 6 yr. = statistical comparison of average grain yield is for 5 yr (1998 to 2002). Grain yield of WW after summer fallow was significantly (P < 0.05) greater than grain yield of annual HRSW each year and when averaged over the 5 yr.

View larger version (42K): [in a new window]   Fig. 3. Grain yield components [(A) spikes per square meter, (B) kernels per spike, and (C) thousand-kernel weight] of winter wheat (WW) after summer fallow compared with continuous annual no-till hard red spring wheat (HRSW) during 5 yr. Within-year means followed by a different letter are significantly different at P < 0.05. ns = no significant difference.