Presentation on theme: "Biomass shifts and suppresses weed populations under conservation agriculture Michael J. Mulvaney, Virginia Tech, USA C. Wes Wood, Auburn University, USA."— Presentation transcript:
Biomass shifts and suppresses weed populations under conservation agriculture Michael J. Mulvaney, Virginia Tech, USA C. Wes Wood, Auburn University, USA Andrew J. Price, USDA ARS National Soil Dynamics Lab, USA SANREM CRSP is made possible by the United States Agency for International Development and the generous support of the American people through USAID Cooperative Agreement No. EPP-A-00-04-00013-00.
Introduction Conservation agriculture: –↓ Erosion –↑ SOM –↑ Soil moisture –Improved soil structure –Soil temperature moderation Kip Balkcom, 2008
CA for limited-input smallholders #1 problem: Weed suppression
Conclusions Forage soybean does not effectively suppress weeds Broadleaf and sedge control –suppressed under high biomass CA after 1 st yr Grass control –variable, increases in 2 nd yr Population shifts from broadleaves and sedges toward grasses Conversion from fallow to CA increased SOC Yield not affected by mulching or forage soybean