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Green manuring with clover and ryegrass catch crops undersown in spring wheat: effects on soil structure
Author(s) -
Breland T.A.
Publication year - 1995
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.1995.tb00950.x
Subject(s) - agronomy , plough , loam , trifolium repens , soil structure , seedbed , lolium multiflorum , monoculture , panicum virgatum , arable land , environmental science , biology , sowing , soil water , agriculture , soil science , ecology , bioenergy , renewable energy
. The objective of the present study was to investigate the potential of undersown catch crops to counteract soil degradation after autumn ploughing. Italian ryegrass ( Lolium multiflorum Lam.) and white clover ( Trifolium repens L.) were undersown in spring wheat on a loam soil in southern Norway, allowed to grow as cover crops after grain harvest and ploughed in to 20 cm depth as green manure in late October. Ryegrass prevented a collapse of the ridged plough furrow profile during winter, which occurred on grain monoculture and white‐clover plots. Also, it tended to improve the water stability of aggregates, aggregate size distribution, bulk density, and pore volume in soil sampled in May. The preservation of the plough furrow profile was mainly attributed to enmeshment by an extensive system of fine roots and less to rhizosphere and microbial effects on aggregate stability. The results showed that ryegrass catch crops may give rapid structure improvements that are likely to contribute appreciably to easier seedbed preparation and less soil degradation in arable farming systems, even if the soil is ploughed in autumn.