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Soil organic matter pools during early adoption of conservation tillage in northwestern Canada

Franzluebbers, A.J. (Agriculture and Agri-Food Canada, Beaverlodge, Alberta, Canada.) ; Arshad, M.A

Soil Science Society of America journal, 1996-09, Vol.60 (5), p.1422-1427 [Periódico revisado por pares]

Madison, WI: Soil Science Society of America

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Título:
Soil organic matter pools during early adoption of conservation tillage in northwestern Canada
Autor: Franzluebbers, A.J. (Agriculture and Agri-Food Canada, Beaverlodge, Alberta, Canada.) ; Arshad, M.A
Assuntos: Agriculture ; Agronomy. Soil science and plant productions ; ALBERTA ; AZOTE ; Biological and medical sciences ; BIOMASA ; BIOMASSE ; Carbon ; CARBONE ; CARBONO ; CERO-LABRANZA ; Chemical, physicochemical, biochemical and biological properties ; FLORA DEL SUELO ; FLORE DU SOL ; Fundamental and applied biological sciences. Psychology ; LABRANZA ; LABRANZA DE CONSERVACION ; MATERIA ORGANICA DEL SUELO ; MATIERE ORGANIQUE DU SOL ; MINERALISATION ; MINERALIZACION ; Nitrogen ; NITROGENO ; NON TRAVAIL DU SOL ; Organic chemistry ; Organic matter ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; Soil science ; Soils ; SOL ARGILEUX ; SUELO ARCILLOSO ; Tillage ; TRAVAIL DU SOL ; TRAVAIL DU SOL DE CONSERVATION
É parte de: Soil Science Society of America journal, 1996-09, Vol.60 (5), p.1422-1427
Notas: P34
F07
9703620
ObjectType-Article-2
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Descrição: Changes in soil organic matter (SOM) pools during adoption of reduced (RT) or zero tillage (ZT) can influence soil physical properties, nutrient cycling, and CO2 flux between soil and atmosphere. We determined soil organic C (SOC), soil microbial biomass C (SMBC), basal soil respiration (BSR), and mineralizable N to a depth of 200 mm at the end of 3, 5, and 6 yr after implementation of tillage management on a Falher clay (fine, montmorillonitic, frigid Typic Natriboralf) near Rycroft, Alberta, in a canola (Brassica campestris L.)-wheat (Triticum aestivum L.)-barley (Hordeum vulgare L.)-fallow cropping system. At the end of 6 yr, SOC was not different among tillage regimes and averaged 8.6 kg m-2. At the end of 3 and 5 yr, SMBC was not significantly different among tillage regimes, but at the end of 6 yr SMBC was 7% greater in RT and 9% greater in ZT than in conventional tillage (CT). Basal soil respiration and mineralizable N at the end of 6 yr were not different among tillage regimes following barley and averaged 2.7 g CO2-C m-2 d-1 and 5.0 g inorganic N m-2 24 d-1, respectively. However, BSR following fallow was 2.2, 2.5, and 2.6 g CO2-C m-2 d-1 in CT, RT, and ZT, respectively. Mineralizable N following fallow was 5.8 g inorganic N m-2 (24 d)-1 in RT and ZT and 7.3 g inorganic N m-2 (24 d)-1 in CT. At 0 to 50 mm, there was no significant increase in SOC at the end of 6 yr, a 17 to 36% increase in SMBC, and a 12 to 69% increase in BSR with ZT compared with CT, depending on rotation phase. Relatively small changes in SOM pools with adoption of conservation tillage may be attributable to the large amount of SOM initially present and the cold, semiarid climate that limits SOM turnover
Editor: Madison, WI: Soil Science Society of America
Idioma: Inglês

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Soil organic matter pools during early adoption of conservation tillage in northwestern Canada

Franzluebbers, A.J. (Agriculture and Agri-Food Canada, Beaverlodge, Alberta, Canada.) ; Arshad, M.A

Madison, WI: Soil Science Society of America

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