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Gregory P. Asner
Journal Articles

Direct Impacts on Local Climate of Sugarcane Expansion in Brazil

Scott Loarie, David Lobell, Greg P. Asner, Qiaozhen Mu, Christopher Field
Nature Climate Change, 2011 April 17, 2011

The increasing global demand for biofuels will require conversion of conventional agricultural or natural ecosystems. Expanding biofuel production into areas now used for agriculture reduces the need to clear natural ecosystems, leading to indirect climate benefits through reduced greenhouse-gas emissions and faster payback of carbon debts. Biofuel expansion may also cause direct, local climate changes by altering surface albedo and evapotranspiration, but these effects have been poorly documented.

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Journal Articles

Analysis of Wheat Yield and Climate Trends in Mexico

David Lobell, Ivan Ortiz-Monasterio, Gregory P. Asner, Pamela Matson, Rosamond L. Naylor, Walter P. Falcon
Field Crops Research, 2005 December 31, 2005

Wheat yields in Mexico, which represent an important measure of breeding and management progress in developing world wheat production, have increased by 25% over the past two decades. Using a combination of mechanistic and statistical models, we show that much of this increase can be attributed to climatic trends in Northwest states, in particular cooling of growing season nighttime temperatures.

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Journal Articles

Combining Field Surveys, Remote Sensing and Regression Trees to Understand Yield Variations in an Irrigated Wheat Landscape

David Lobell, Ivan Ortiz-Monasterio, Gregory P. Asner, Rosamond L. Naylor, Walter P. Falcon
Agronomy Journal, 2005 January 1, 2005

Improved understanding of the factors that limit crop yields in farmers' fields will play an important role in increasing regional food production while minimizing environmental impacts. However, causes of spatial variability in crop yields are poorly known in many regions because of limited data availability and analysis methods. In this study, we assessed sources of between-field wheat (Triticum aestivum L.) yield variability for two growing seasons in the Yaqui Valley, Mexico.

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Journal Articles

Relative Importance of Soil and Climate Variability for Nitrogen Management in Irrigated Wheat

David Lobell, Ivan Ortiz-Monasterio, Gregory P. Asner
Field Crops Research, 2004 December 31, 2004

Increased efficiency of nitrogen (N) fertilizer use may be achieved with management practices that account for spatial variability in soil properties and temporal variability in climate. In this study, we develop a N management decision model for an irrigated wheat system that incorporates hypothetical diagnostics of soil N and growing season climate. The model is then used to quantify the potential value of these forecasts with respect to wheat yields, farmer profits, and excess N application. Under the current scenario (i.e.

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