Vegetation with an adequate supply of water might contribute to cooling the land surface around it through latent heat flux transpiration. This study investigates potential estimation evaporative at plot scale, using soybean as example. Some plants’ physiological parameters were monitored and sampled weekly intervals. A physics-based model was then applied estimate irrigation-induced effect wit...

Current, how to use limited water resources efficiently and improve agricultural efficiency, has become one of the greatest challenges for global food security. In this study, multiple site-years carbon flux data across major crops including maize, winter wheat soybean, were used quantify variability in canopy-scale transpiration (T), ecosystem-scale evapotranspiration (ET) as well associated e...

Remote sensing has been shown to be a promising technology for the detection and monitoring of plant stresses including insect feeding. Popillia japonica Newman, is an invasive species in United States, pest concern soybean, Glycine max (L.) Merr., upper Midwest. To investigate effects P. feeding injury (i.e., defoliation) on soybean canopy spectral reflectance yield, field trials with plots ca...

The projected rise in atmospheric CO2 concentration is expected to increase growth and yield of many agricultural crops. The magnitude of this stimulus will partly depend on interactions with other components of the atmosphere such as tropospheric O3. Elevated CO2 concentrations often lessen the deleterious effects of O3, but the mechanisms responsible for this response have received little dir...

A growing number of studies have focused on evaluating vegetation indices in terms of their sensitivity to vegetation biophysical parameters as well as to external factors affecting canopy reflectance. In this context, leaf and canopy radiative transfer models have provided a basis for understanding the behaviour of such indices, particularly their resistance to external perturbing effects rela...

Stomatal responses to atmospheric change have been well documented through a range of laboratory- and field-based experiments. Increases in atmospheric concentration of CO(2) ([CO(2)]) have been shown to decrease stomatal conductance (g(s)) for a wide range of species under numerous conditions. Less well understood, however, is the extent to which leaf-level responses translate to changes in ec...

Potato and wheat plants were grown for 50 d at 400, 1000 and 10000 micromoles mol-1 carbon dioxide (CO2). and sweetpotato and soybean were grown at 1000 micromoles mol-1 CO2 in controlled environment chambers to study stomatal conductance and plant water use. Lighting was provided with fluorescent lamps as a 12 h photoperiod with 300 micromoles m-2 s-1 PAR. Mid-day stomatal conductances for pot...