Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions

The Atrium, University of Guelph Institutional Repository

Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions

Show simple item record

dc.contributor.author de Varennes, A.
dc.contributor.author Torres, M.O.
dc.contributor.author Cunha-Queda, C.
dc.contributor.author Goss, M.J.
dc.contributor.author Carranca, C.
dc.date.accessioned 2011-04-29T20:32:13Z
dc.date.available 2011-04-29T20:32:13Z
dc.date.issued 2007
dc.identifier.citation de Varennes, A., Torres, M.O., Cunha-Queda, C., Goss, M.J., and Carranca, C. "Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions." Biology and Fertility Soils 44.1 (2007): 49-58
dc.identifier.uri http://hdl.handle.net/10214/2668
dc.description.abstract We investigated conservation and cycling of N under oat–oat and lupine–oat rotations in disturbed and undisturbed soil, when roots or roots plus aboveground residues were retained. Crop residues were labelled with 15N in Year 1, and differential soil disturbance was imposed after harvest. In Year 2, plant growth, N transfer from residue into the various sinks of the second crop (plant, soil, and residual residues), and changes in microbial activity and numbers were determined. Oat biomass was greater after lupine than after oat due to differences in supply of N from these residues. Buried residues of both crops appeared to decompose faster than when left on the soil surface. Lupine residues decomposed faster than oat residues. Oat biomass was not affected by soil disturbance if grown after lupine but decreased when oat straw was buried in the soil. More residue N was recovered from soil than from the crop. Most 15N was recovered from disturbed soil, which also had greater dehydrogenase activity and more culturable fungi. At the end of the oat–oat rotation, 20 and 5 kg N ha−1 were derived from the roots of the first crop in undisturbed or disturbed soil, respectively. Equivalent values for the lupine–oat rotation were 18 and 44 kg N ha−1. Returning aboveground residues provided an extra 52–80 kg N ha−1 for oat and 61–63 kg N ha−1 for lupine relative to treatments where they were removed. Over a year, lupine contributed 9 to 20 kg N ha−1 more to the agroecosystem than did oat.
dc.language.iso en en_US
dc.publisher Biology and Fertility Soils en_US
dc.subject Crop residues en_US
dc.subject Legumes en_US
dc.subject N conservation en_US
dc.subject Lupine en_US
dc.subject Oat en_US
dc.subject Soil disturbance en_US
dc.title Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions en_US
dc.type Article en_US


Files in this item

Files Size Format View
devarennesetal_2007.pdf 311.5Kb PDF View/Open

This item appears in the following Collection(s)

Show simple item record

Search the Atrium


Advanced Search

Browse

My Account