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CROPPING SYSTEMS

Transition from Intensive Tillage to No-Tillage and Organic Diversified Annual Cropping Systems

^a Dep. Land Resources and Environ. Sci., Montana State Univ., 334 Leon Johnson Hall, Bozeman, MT 59717-3120
^b Dep. Agric. Econ. and Econ., Montana State Univ., 306 Linfield Hall, Bozeman, MT 59717-2920

^* Corresponding author (pmiller{at}montana.edu).

Transition to no-till (NT) and organic (ORG) farming systems may enhance sustainability. Our objectives were to compare transitional crop productivity and soil nutrient status among diversified NT and ORG cropping systems in Montana. Three NT systems were designed as 4-yr rotations, including a pulse (lentil [Lens culinaris Medik.] or pea [Pisum sativum L.]), an oilseed (canola [Brassica napus L.] or sunflower [Helianthus annuus L.]) and two cereal crops (corn [Zea mays L.], proso millet [Panicum miliaceum L.], or wheat [Triticum aestivum L.]). No-till continuous wheat was also included. The ORG system included a green manure (pea), wheat, lentil, and barley (Hordeum vulgare L.) and received no inputs. Winter wheat in the ORG system yielded equal or greater than in the NT systems, and had superior grain quality, even though 117 kg N ha^–1 was applied to the NT winter wheat. After 4 yr, soil nitrate-N and Olsen-P were 41 and 14% lower in the ORG system, whereas potentially mineralizable N was 23% higher in the ORG system. After 4 yr, total economic net returns were equal between NT and ORG systems on a per-ha basis. Studying simultaneous transition to diversified NT and ORG cropping systems was instructive for increased sustainability.

Abbreviations: NT, no-till • NTS, system that emphasized only cool-season spring crops • NTW, system that emphasized winter crops • NTD, system that was highly diversified • NTCW, continuous wheat system alternating annually between spring wheat and winter wheat • ORG, organic • PMN, potentially mineralizable N • SOM, soil organic matter

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Received for publication June 3, 2007.