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Tillage Effects on Water Use and Grain Yield of Winter Wheat and Green Pea in Rotation

^a Oregon State Univ., Columbia Basin Agricultural Research Center, P.O. Box 370, Pendleton, OR 97801
^b USDA-ARS Columbia Plateau Conservation Research Center, Pendleton, OR 97801 (retired). Contribution of Oregon State University, Columbia Basin Agricultural Research Center, PO Box 370, Pendleton, OR 97801

View larger version (35K): [in this window] [in a new window]   Fig. 1. Maximum tillage (MT), fall plow (FP), spring plow (SP), and minimum tillage (MinT) effects on soil profile water storage distribution (mm 305 mm–1) during (a) winter wheat phase (pea harvest to first spring moisture reading) and (b) green pea phase (wheat harvest to first spring moisture reading) at Columbia Basin Agricultural Research Center (CBARC), Pendleton, OR. Means (at each depth zone) with the same letter are not significantly different at the 0.05 probability level.

View larger version (38K): [in this window] [in a new window]   Fig. 2. Maximum tillage (MT), fall plow (FP), spring plow (SP) (FP for wheat), and minimum tillage (MinT) effects on grain yield of winter wheat and green pea in rotation at Columbia Basin Agricultural Research Center (CBARC), Pendleton, OR from 1977 to 1982 and 1985. The graphs also show crop-year precipitation (CYppt) (1 September–31 August), winter precipitation (WTppt) (1 September–28 February), and growing season precipitation (GSppt) (1 March–31 August). Means (within each year) with the same letter are not significantly different at the 0.05 probability level.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Maximum tillage (MT), fall plow (FP), spring plow (SP), and minimum tillage (MinT) effects on grain yield and water use efficiency of (a) winter wheat and (b) green pea in rotation at Columbia Basin Agricultural Research Center (CBARC), Pendleton, OR. Data shown are 7-yr means (1977–1982 and 1985).

View larger version (21K): [in this window] [in a new window]   Fig. 4. Grain yield and water use efficiency of winter wheat and green pea in rotation at Columbia Basin Agricultural Research Center (CBARC), Pendleton, OR. Data shown are 7-yr means (1977–1982 and 1985).