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Tillage Method and Sowing Rate Relations for Dryland Spring Wheat, Barley, and Oat

Dep. of Crop and Soil Sciences, Washington State Univ., Dryland Research Station, P.O. Box B, Lind, WA 99341

View larger version (60K): [in a new window]   Fig. 1. Yearly and 4-yr average plant stand, grain yield, yield components, and straw production for spring-sown wheat, barley, and oat. Data are combined across two tillage methods (conservation-till and no-till) and three sowing rates (120, 200, and 280 seed m–2). Within-year and 4-yr-average means followed by the same letter are not significantly different at the 0.05 probability level.

View larger version (52K): [in a new window]   Fig. 2. Plant stand, grain yield, yield components, and straw production for spring-sown wheat, barley, and oat as affected by three sowing rates (120, 200, and 280 seeds m–2) combined across tillage method (conservation-till and no-till) and averaged over 4 yr. Within-crop species means followed by a different letter are not significantly different at the 0.05 probability level.

View larger version (52K): [in a new window]   Fig. 3. Yearly and 4-yr average plant stand, grain yield, yield components, and straw production with conservation-till vs. no-till sowing method. Data are combined across three spring-sown crop species (wheat, barley, and oat) and three sowing rates (120, 200, and 280 seeds m–2). Within-year and 4-yr-average means followed by the same letter are not significantly different at the 0.05 probability level.

View larger version (40K): [in a new window]   Fig. 4. Early-season soil water variation at 0- to 5-, 5- to 10-, and 10- to 15-cm soil depths, and soil temperature in the seed row 4 cm below the soil surface at depth of seed placement, in no-till (NT) vs. conservation-till (CT) (zero line) spring wheat (200 seeds m–2 sowing rate) during 4 yr. The first number below bars indicates days without precipitation (DWP) preceding soil water and soil temperature measurements. The second number below bars is the amount of precipitation (mm) that occurred during the last precipitation event. Bars below the zero line indicate less water or lower temperature with NT compared with CT. Bars above the zero line indicate more water or higher temperature with NT compared with CT. *,**,*** = significant differences at the 0.05, 0.01, and 0.001 probability level, respectively.