A5078211028- Soil Geostatistics and Mapping
- Climate change impacts on agriculture
- Crop Yield and Soil Fertility
- Plant responses to elevated CO2
- Forest Management and Policy
- Soybean genetics and cultivation
- Water-Energy-Food Nexus Studies
- Soil Carbon and Nitrogen Dynamics
- Greenhouse Technology and Climate Control
- Energy and Environment Impacts
- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Science Education and Pedagogy
- Wheat and Barley Genetics and Pathology
- Early Childhood Education and Development
- Infant Development and Preterm Care
- Experimental and Theoretical Physics Studies
- Sustainable Agricultural Systems Analysis
- Agriculture and Rural Development Research
- Food Security and Health in Diverse Populations
- Invertebrate Taxonomy and Ecology
- Science and Climate Studies
- Geochemistry and Geologic Mapping
- Remote Sensing in Agriculture
Johns Hopkins University
2018-2019
Johns Hopkins University School of Advanced International Studies
2018
World Agroforestry Centre
2009
University of Maryland, College Park
2000-2001
Duke University
1997
Agricultural Research Service
1995-1996
We studied crop harvested yield, as recorded in national agricultural statistics, to estimate net primary production (NPP) regions where most of the land area is sown with a few, well-studied crops. estimated magnitudes and interannual variations NPP croplands U.S. Midwest using yield data obtained from National Agricultural Statistics Service (NASS). Total NPP, including estimates above- belowground components, was calculated harvested-yield by (1) conversion reporting units product...
Agriculture must raise productivity while addressing climate change in order to ensure the food security of a growing population. Adding fossil fuel energy agricultural system can increase through use manufactured fertilizer but creates greenhouse gas emissions. This study quantifies an alternative which is added substitution solar for by tree species Faidherbia albida. be quantified as avoided emission gas, benefit. albida trees have unusual phenology, leafing out during dry season and...
Abstract Increases in atmospheric CO 2 concentration are likely to have a significant impact on the climate and affect growth development of crops. The effect change crops has be assessed for large areas provide information global estimates regional strategy development. In this study, computer simulations were done using soybean [ Glycine max (L.) Merr.] crop model GLYCIM assess effects these changes yields state Iowa. ability accurately predict was tested by comparing results with curve...
This model of leaf gas exchange includes (1) two-dimensional C02, 02 and water vapour diffusion in inter- cellular space schematized according to anatomy, (2) CO2 assimilation by mesophyll cells as described Farquhar's photosynthesis (3) stomatal movements a regulating factor. Parameters describing the cross-section properties replace empirical parameters earlier models. The was tested for soybean performed well representing light, concentration ((CO21), temperature response curves...
Abstract Global climate change could have a significant impact on important food crops such as soybean [ Glycine max (L.) Merr.]. To assess the of these environmental changes, estimates crop yields are needed, with special reference to regional responses in key production areas. The objective this study was examine performance GLYCIM model modeling Iowa at state and county level, over 20‐yr period. has been extended run for multiple years combined aggregations soil weather data provide...
The latest in a series of Landsat terrestrial observatories was launched April 15 and for the first time mission configuration captures dream envisioned by Earth scientists more than quarter century ago. 7 now has capability operations strategy to dynamically monitor all Earth's land areas annually paving way toward better understanding dynamics that result from natural stresses human activities. Landsat's long term acquisition plan (LTAP) is an ambitious step forward satellite, which been...
Undergraduate science instructors are concerned that the traditional lecture centered approach may not be most effective. The objective of this work was to integrate alternative teaching methods into a small, upper-division course had previously been taught as course, and thus impart current understanding biogeography students. An on with focus global climate change natural resource use forum for combination conventional interactive inquiry-based learning methods. aspect retained ensure...
Abstract The system of soil classification used in the U.S. taxonomy has been criticized as being based on flawed 19th century logic John Stuart Mill. Mill postulated that objects have self‐evident properties will be apparent to any observer. Further, these reflect inherent differences between objects. However, language shapes perception a great extent, and knowledge external reality can obtained only by observation. It cannot assumed all observers, particularly those using different...
Faidherbia albida trees have an unusual phenology, leafing out during the dry season and shedding leaves at start of rainy season. When integrated into agroforestry cropping systems, they provide substantial sustainability benefits, including adding plant nutrients organic matter to soil through leaf drop. Dormant season, does not compete with crop for light, water or contributes nitrogen under its canopy, enhancing productivity. This benefit is analyzed in relation equivalent industrially...
(2000). Earth Worm: Biomass Measurement: A Science Activity for Middle School. Activities: Vol. 37, No. 2, pp. 33-38.