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- W2084326960 abstract "In the Fraser River Delta of British Columbia, Canada, one in three farms faces soil problems associated with poor structure and low organic matter content. Surface soil structure usually degrades in early spring due to prolong wet conditions and a lack of surface cover during winter. Rates of change of surface soil aggregation under different overwinter cover crops followed by spring tillage operations were studied on a lowland soil in the Fraser River. Cover cropping treatments were bare control, winter-killed spring barley (Hordeum vulgare L.) (cv. Virden), fall rye (Secale cereale L.) (cv. Danko) and annual ryegrass (Lolium multiflorum Lam.) (cv. Westerwolds). Aggregate stability, expressed as mean weight diameter (MWD) and the 2–6 mm aggregate-size fraction, decreased from fall to spring, then increased again over summer months. This seasonal variation in MWD was much more pronounced in the least stable bare soil than in the more stable cover cropped soils. In spring, overwinter cover crops had significantly higher MWD and the proportion of 2–6 mm water-stable aggregates up to 0.75 mm and 0.27 kg kg−1, respectively, when compared to bare control soil. Improved aggregate stability with cover crops was related to increasing organic carbon in the soil. After the plots were cultivated in spring, winter cropped soils had lower proportion of > 6 mm clods up to 0.28 kg kg−1 than did soils left bare over winter. On the other hand, tilled plots had higher MWD and 2–6 mm aggregates for all cover cropping treatments due to lower aggregate water content at sampling, when compared to no-tilled plots. Overall, the greatest improvement in aggregate stability was observed under annual ryegrass, followed by fall rye and winter-killed spring barley. The results suggest that winter cover crops, such as annual ryegrass, may protect aggregate breakdown during winter and result in better structure after spring tillage operations when compared to the bare soil." @default.
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- W2084326960 date "1997-12-01" @default.
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- W2084326960 title "Effects of winter cover crops and successive spring tillage on soil aggregation" @default.
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- W2084326960 doi "https://doi.org/10.1016/s0167-1987(97)00043-3" @default.
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