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Cropping Sequence Effects of Four Broadleaf Crops on Four Cereal Crops in the Northern Great Plains

Dep. of Land Resour. and Environ. Sci., P.O. Box 173120, Montana State Univ., Bozeman, MT 59717-3120

View larger version (50K): [in a new window]   Fig. 1. Cumulative plant-available water and potential evapotranspiration (Thornthwaite) during consecutive growing seasons at five locations in Montana. Plant-available soil water at the start of the growing season was estimated by using the "lower limit" method in wheat stubble (Ritchie, 1981).

View larger version (61K): [in a new window]   Fig. 2. Cumulative soil water depletion by Year 1 crops measured in 0.3-m-depth increments by comparing soil water status with the chem fallow control at four sites in Montana. Bars marked with the same letter do not differ (P < 0.10). Denton is not included because the soil depth was only 0.6 m and soil water differences among crops did not occur at that site due to the shallow soil.

View larger version (67K): [in a new window]   Fig. 3. Spring soil nitrate N to 0.6 m and crop available water to 0.6 m at Denton, 0.9 m at Havre and Dutton, and 1.2 m at Bozeman and Amsterdam, MT, at seeding of the Year 2 cereal test crops. > or < denote differences from spring wheat within each site (P = 0.10).