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Potential consequences of climate change on crop production can be studied using mechanistic crop simulation models. While a broad variety of maize simulation models exist, it is not known whether different models diverge on grain yield responses to changes in climatic factors, or whether they agree in their general trends related to phenology, growth, and(More)
Traditional methods for studying tree roots are destructive and labor intensive, but available nondestructive techniques are applicable only to small scale studies or are strongly limited by soil conditions and root size. Soil electrical resistivity measured by geoelectrical methods has the potential to detect belowground plant structures, but quantitative(More)
This paper presents ideas for a new generation of agricultural system models that could meet the needs of a growing community of end-users exemplified by a set of Use Cases. We envision new data, models and knowledge products that could accelerate the innovation process that is needed to achieve the goal of achieving sustainable local, regional and global(More)
The following review paper presents an overview of the current crop yield forecasting methods and early warning systems for the global strategy to improve agricultural and rural statistics across the globe. Different sections describing simulation models, remote sensing, yield gap analysis, and methods to yield forecasting compose the manuscript. 1.(More)
The response of wheat crops to elevated CO2 (eCO2) was measured and modelled with the Australian Grains Free-Air CO2 Enrichment experiment, located at Horsham, Australia. Treatments included CO2 by water, N and temperature. The location represents a semi-arid environment with a seasonal VPD of around 0.5 kPa. Over 3 years, the observed mean biomass at(More)
There is intensive cultivation of olives on sloping land in Jaen-Granada (Spain), Basilicata (Italy) and Western Crete (Greece). The intensive olive groves here are characterised by a tree density of about 250treesha(-1), yearly fertilisation and pruning, several chemical sprays for pest control, soil tillage once to thrice per year and irrigation up to(More)
We explore the unsustainable path that the Ogallala region faces, and provide some suggestions for policies that would extend the usable lifespan of the water in the aquifer, which supports the vast majority of the economy across this region. We emphasize the critical role of science as a foundation for policies that can help mitigate the disaster that is(More)
Remotely sensed vegetation indices have been extensively used to quantify plant and soil characteristics. The objectives of this study were to: (i) compare vegetation indices developed at different scales for measuring canopy N content (g∙N∙m −2 ) and concentration (%); and (ii) evaluate the effects of soil background reflectance, cultivar, illumination and(More)
Crop models of crop growth are increasingly used to quantify the impact of global changes due to climate or crop management. Therefore, accuracy of simulation results is a major concern. Studies with ensembles of crop models can give valuable information about model accuracy and uncertainty, but such studies are difficult to organize and have only recently(More)
Liu, B., Asseng, S., Müller, C., Ewert, F., Elliott, J., Lobell, D. B., Martre, P., Ruane, A., Wallach, D., Jones, J. W., Rosenzweig, C., Aggarwal, P. K., Alderman, P., Anothai, J., Basso, B., Biernath, C., Cammarano, D., Challinor, A. C., Deryng, D., De Sanctis, D., Doltra, J., Fereres, E., Folberth, C., Garcia-Vila, M., Gayler, S., Hoogenboom, G., Hunt,(More)