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Crop Residue Coverage of Soil Influenced by Crop Sequence in a No-Till System

^a USDA-ARS, Northern Great Plains Research Lab., Box 0459, Mandan, ND 58554-0459
^b Univ. of Mary, 7500 University Dr., Bismarck, ND 58504

View larger version (43K): [in this window] [in a new window]   Fig. 1. Growing season precipitation and average air temperature on a monthly basis over the course of the crop sequence project and 22 yr average. (A) Monthly precipitation. (B) Monthly average air temperature.

View larger version (29K): [in this window] [in a new window]   Fig. 2. Crop residue coverage of soil surface (Project Year 2) measured after seeding spring wheat into the residue of 10 crops during the establishment of the crop matrix at two sites. Bars with the same letter do not differ significantly at P 0.05.

View larger version (49K): [in this window] [in a new window]   Fig. 3. Crop residue coverage (Project Year 3) of selected groups of crop sequence treatments measured after seeding spring wheat into the residue of the crop matrix. * = crop sequence treatments with statistically less residue coverage than the continuous spring wheat treatment according to Dunnett's one-tailed t test (P < 0.05).

View larger version (32K): [in this window] [in a new window]   Fig. 4. Summary of crop residue coverage of soil (Project Year 3) for 36 crop sequence combinations of three crops with higher residue coverage the following year (proso millet, grain sorghum, and spring wheat) and three crops with lower residue coverage the following year (lentil, chickpea and sunflower). Bars with the same letter do not differ significantly with Student-Newman-Keuls' test analyses (P 0.05). Low = lower crop residue coverage of soil surface, High = higher crop residue coverage of soil surface.