Conservation tillage and seeding systems in the South Pacific

Choudhary, Madhu; Baker, C.J.

doi:10.1016/0167-1987(93)90073-x

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…In order to replace natural fallows, different techniques have been tested to ensure the sustainability of plant productivity of rainfed crops (maize, beans, cassava, and peanuts). Legume cover crops seem a good way to restore and/or to conserve soil fertility by controlling weeds and erosion and by enhancing carbon and nitrogen stocks in soil [4,6,12,13,26].…”

Section: Introductionmentioning

confidence: 99%

Long-term effect of a legume cover crop (Mucuna pruriens var. utilis) on the communities of soil macrofauna and nematofauna, under maize cultivation, in southern Benin

Blanchart

Villenave

Viallatoux

et al. 2006

European Journal of Soil Biology

126

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Section: Introductionmentioning

confidence: 99%

Long-term effect of a legume cover crop (Mucuna pruriens var. utilis) on the communities of soil macrofauna and nematofauna, under maize cultivation, in southern Benin

Blanchart

Villenave

Viallatoux

et al. 2006

European Journal of Soil Biology

126

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“…An alternative to conventional tillage (CT) is no-tillage (NT) that aims for sustainable agricultural production. A growing acceptance of NT is largely due to reduced soil erosion and runoff (Choudhary and Baker, 1993), enhanced water retention and infiltration (Choudhary et al, 1996), lower summer temperatures (Prihar et al, 1996) and possible increased net return to the farmer (Reicosky, 1994). However, the impact NT has on N 2 O emission is not known for these Manawatu soils.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide emissions from a New Zealand cropped soil: tillage effects, spatial and seasonal variability

Choudhary

Акрамханов

Saggar

2002

Agriculture, Ecosystems & Environment

114

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Agricultural practices are believed to be the major anthropogenic source of enhanced nitrous oxide (N 2 O) gas emissions in New Zealand. Studies conducted in New Zealand generally suggest low N 2 O emission from pasture; however, there is little information for arable farming systems. This paper evaluates tillage and land use effects on N 2 O emissions using a closed chamber technique at an Ohakea silt loam (Gleyic luvisol) where winter oats (Avena sativa L.)/fodder maize (Zea mays L.) was double-cropped for 5 years. The tillage types included conventional tillage (CT) and no-tillage (NT) systems, and a permanent pasture (PP) was used as a control.Spatial variability in all treatments showed large inherent variations in N 2 O fluxes (a mean CV = 119%), which reflected natural soil heterogeneity, and perhaps the measurement technique used rather than the real differences due to the tillage and cropping systems evaluated. On an annualised basis, N 2 O emissions measured from December 1998 to September 1999 from the PP (1.66 kg N 2 O-N/ha per year or 19 g N 2 O-N/(m 2 h)) were significantly lower than the CT and NT fields averaging at 9.20 (or 105) and 12.0 (or 137) kg N 2 O-N/ha per year (or g N 2 O-N/(m 2 h)), respectively. However, there were no differences in N 2 O emission rates between the CT and NT treatments. Seedbed preparation using a power harrow which followed within a few days of first ploughing the CT field reduced N 2 O emissions by 65% within the first hour after power harrowing. However, N 2 O emission rates returned to the pre-power harrowing levels at the next sampling period, which was 1 month later.There was a strong relationship between log-transformed data of soil water content (SWC) and N 2 O emissions in all treatments with r = 0.73, 0.75 and 0.86 for the PP, CT and NT treatments, respectively. Seasonal variations in N 2 O emission from the PP were in the order of winter = autumn > summer. Although fluxes in the CT were higher in winter than in the autumn season, there were no differences between the summer and autumn data. The seasonal variations in N 2 O emission in the NT treatment were in the order of winter > autumn = summer.

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