Accurately anticipating the impacts of urbanization has clear environmental and economic advantag... more Accurately anticipating the impacts of urbanization has clear environmental and economic advantages. The growing number of impaired Florida waters and associated Total Maximum Daily Loads (TMDLs) suggests that a more reliable alternative to the current “rebuttable presumption of compliance” is needed to evaluate water quality impacts. This paper considers the use of dynamic watershed simulation models for evaluating water quality impacts associated with the design and fertilization practices of master planned communities. Specifically, this study uses the Watershed Assessment Model (WAM) to simulate nutrient loading associated with two distinct plans (extensive and compact) proposed for the Restoration Development of Regional Impact in Edgewater, FL. Preliminary simulations indicate that N and P loadings can be positively and significantly lowered (by 47% and 31%, respectively, in this case study) as a direct result of reduced inputs and the preservation of open space, attained with...
This 6-page fact sheet discusses basics about water consumption for single-family, detached homes... more This 6-page fact sheet discusses basics about water consumption for single-family, detached homes served by Gainesville Regional Utilities, information about the highest water users, and impacts of irrigation on water consumption. Written by Nick Taylor, Kaitlin Olander Robb Price, Bradley Spatz, Tricia Kyzar, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, September 2020.
This fact sheet provides current, basic information about residential water use in Orange County.... more This fact sheet provides current, basic information about residential water use in Orange County. Written by Nick Taylor, Kaitlin Olander Robb Price, Bradley Spatz, Parker Johnson, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, June 2021.
Rising atmospheric carbon dioxide concentration [CO[sub 2]] is expected to cause increases in cro... more Rising atmospheric carbon dioxide concentration [CO[sub 2]] is expected to cause increases in crop growth and yield. The objective of this study was to investigate effects of subambient, as well as superambient [CO[sub 2]] on soybean [Glycine max (L.) Merr] dry matter production and allocation for two reasons: to assess response of plants to prehistoric as well as future expected CO[sub 2] levels and to increase confidence in [CO[sub 2]] response curves by imposing a wide range of [CO[sub 2]] treatments. Soybean was grown in outdoor, sunlit, controlled-environment chambers at CO[sub 2] levels of 160, 220, 280, 330, 660, and 990 [mu]mol (CO[sub 2]) mol[sup [minus]1] (air). Total dry matter growth rates during the linear phase of vegetative growth were 5.0, 8.4, 10.9, 12.5, 18.2 and 20.7 g m[sup [minus]2]d[sup [minus]1] for the above respective [CO[sub 2]]. Samples taken from 24 to 94 d after planting showed that the percentage of total plant mass in leaf trifoliolates decreased with increasing [CO[sub 2]] whereas the percentage in structural components increased. At final harvest the respective [CO[sub 2]] treatments resulted in 38, 53, 62, 100, 120, and 92% seed yield with respect to the 330 [mu]mol mol[sup [minus]1] treatment. Total dry weight responses were similar. Late season spider mite damage of the 990 and 280 [mu]mol mol[sup [minus]1] treatments reduced yields. These data confirm not only that rising CO[sub 2] should increase plant growth, but also that plant growth was probably seriously limited by atmospheric [CO[sub 2]] in preindustrial revolution times back to the previous global glaciation.
This fact sheet provides current, basic information about residential water use in Osceola County... more This fact sheet provides current, basic information about residential water use in Osceola County, Florida. Written by Nick Taylor, Kaitlin Robb Price, Bradley Spatz, Parker Johnson, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, November 2021.
Interest in understanding water use and irrigation costs has risen in recent years. This case stu... more Interest in understanding water use and irrigation costs has risen in recent years. This case study is a 5-page evaluation of water use and associated costs for residential landscape irrigation in Osceola County and Orange County, Florida. Homeowners in central Florida can use the results to assess their water consumption and bills in relation to similar homes in the area. Written by Nick Taylor, Tricia Kyzar, Pierce Jones, and Kaitlin O. Robb Price, and published by the UF/IFAS Department of Agricultural and Biological Engineering, December 2019.https://edis.ifas.ufl.edu/ae536
... Open top chambers for field studies of crop response to elevated CO 2 and temperature. Auteur... more ... Open top chambers for field studies of crop response to elevated CO 2 and temperature. Auteur(s) / Author(s). JONES P. (1) ; COLLINS LM (1) ; INGRAM KT ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). ... Microclimatologie. ; Plante céréalière. ; Gaz effet serre. ; ...
Educational products and resources for agricultural health and safety, available from four Southe... more Educational products and resources for agricultural health and safety, available from four Southeastern universities, are presented. The products are outputs of the Agricultural Health Promotion System (AHPS) cooperative agreements, funded from 1990 to 1994 by the National Institute for Occupational Safety and Health (NIOSH). Cooperative Extension Services (CESs) of the respective universities developed educational materials and dissemination strategies for Extension
An interactive simulation model of small-volume plant growth chambers was developed for use in im... more An interactive simulation model of small-volume plant growth chambers was developed for use in improving the algorithms needed for computerized real-time enviromental control. The model is useful in studying variations between actual, measured and periodically sampled state variables and how different sampling frequencies affect control errors.
The current climate of opinion in both the residential and commercial sectors for new and existin... more The current climate of opinion in both the residential and commercial sectors for new and existing building stock gives a prominent role to energy efficiency as a policy tool. Executive and legislative branches of government at both the state and federal levels are considering and adopting policy options to valorize energy efficiency in the service of everything from national security to curbing global warming to creating a green economy. While the authors support this activity, it should be noted that actual evidence regarding the benefits or outcomes of most funding initiatives or policy activity in this area remains difficult to assess meaningfully. In this article, the authors stress the need for validation of post-occupancy performance and demonstration of persistence of energy efficiency benefits attributable to energy efficiency initiatives and policy activities, and suggest a methodology to assess actual performance using a well-known green building rating system for homes.
ABSTRACT Complete mass balances of CO//2 and H//2O were maintained on six soybean canopies grown ... more ABSTRACT Complete mass balances of CO//2 and H//2O were maintained on six soybean canopies grown in sunlight at two CO//2 treatment levels, 330 and 660 mu mol mol** minus **1. In each set of CO//2 treatments, the three canopies were differentially watered to create one non-stressed canopy and two water stressed canopies. Seasonal balances were based on daily integrated values of transpiration, daytime CO//2 exchange and nighttime CO//2 exchange. On average, the high CO//2 canopies transpired about 10% less water over the season than did the low CO//2 canopies. Cumulative seasonal net CO//2 exchange rate correlated linearly and positively with seasonal biomass accumulation and seed yield. Whole canopy results are based on the continuous competent operation of the environmental chamber system throughout the 108 day season and confirm the unique utility of this research tool.
Accurately anticipating the impacts of urbanization has clear environmental and economic advantag... more Accurately anticipating the impacts of urbanization has clear environmental and economic advantages. The growing number of impaired Florida waters and associated Total Maximum Daily Loads (TMDLs) suggests that a more reliable alternative to the current “rebuttable presumption of compliance” is needed to evaluate water quality impacts. This paper considers the use of dynamic watershed simulation models for evaluating water quality impacts associated with the design and fertilization practices of master planned communities. Specifically, this study uses the Watershed Assessment Model (WAM) to simulate nutrient loading associated with two distinct plans (extensive and compact) proposed for the Restoration Development of Regional Impact in Edgewater, FL. Preliminary simulations indicate that N and P loadings can be positively and significantly lowered (by 47% and 31%, respectively, in this case study) as a direct result of reduced inputs and the preservation of open space, attained with...
This 6-page fact sheet discusses basics about water consumption for single-family, detached homes... more This 6-page fact sheet discusses basics about water consumption for single-family, detached homes served by Gainesville Regional Utilities, information about the highest water users, and impacts of irrigation on water consumption. Written by Nick Taylor, Kaitlin Olander Robb Price, Bradley Spatz, Tricia Kyzar, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, September 2020.
This fact sheet provides current, basic information about residential water use in Orange County.... more This fact sheet provides current, basic information about residential water use in Orange County. Written by Nick Taylor, Kaitlin Olander Robb Price, Bradley Spatz, Parker Johnson, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, June 2021.
Rising atmospheric carbon dioxide concentration [CO[sub 2]] is expected to cause increases in cro... more Rising atmospheric carbon dioxide concentration [CO[sub 2]] is expected to cause increases in crop growth and yield. The objective of this study was to investigate effects of subambient, as well as superambient [CO[sub 2]] on soybean [Glycine max (L.) Merr] dry matter production and allocation for two reasons: to assess response of plants to prehistoric as well as future expected CO[sub 2] levels and to increase confidence in [CO[sub 2]] response curves by imposing a wide range of [CO[sub 2]] treatments. Soybean was grown in outdoor, sunlit, controlled-environment chambers at CO[sub 2] levels of 160, 220, 280, 330, 660, and 990 [mu]mol (CO[sub 2]) mol[sup [minus]1] (air). Total dry matter growth rates during the linear phase of vegetative growth were 5.0, 8.4, 10.9, 12.5, 18.2 and 20.7 g m[sup [minus]2]d[sup [minus]1] for the above respective [CO[sub 2]]. Samples taken from 24 to 94 d after planting showed that the percentage of total plant mass in leaf trifoliolates decreased with increasing [CO[sub 2]] whereas the percentage in structural components increased. At final harvest the respective [CO[sub 2]] treatments resulted in 38, 53, 62, 100, 120, and 92% seed yield with respect to the 330 [mu]mol mol[sup [minus]1] treatment. Total dry weight responses were similar. Late season spider mite damage of the 990 and 280 [mu]mol mol[sup [minus]1] treatments reduced yields. These data confirm not only that rising CO[sub 2] should increase plant growth, but also that plant growth was probably seriously limited by atmospheric [CO[sub 2]] in preindustrial revolution times back to the previous global glaciation.
This fact sheet provides current, basic information about residential water use in Osceola County... more This fact sheet provides current, basic information about residential water use in Osceola County, Florida. Written by Nick Taylor, Kaitlin Robb Price, Bradley Spatz, Parker Johnson, and Pierce Jones, and published by the UF/IFAS Department of Agricultural and Biological Engineering, November 2021.
Interest in understanding water use and irrigation costs has risen in recent years. This case stu... more Interest in understanding water use and irrigation costs has risen in recent years. This case study is a 5-page evaluation of water use and associated costs for residential landscape irrigation in Osceola County and Orange County, Florida. Homeowners in central Florida can use the results to assess their water consumption and bills in relation to similar homes in the area. Written by Nick Taylor, Tricia Kyzar, Pierce Jones, and Kaitlin O. Robb Price, and published by the UF/IFAS Department of Agricultural and Biological Engineering, December 2019.https://edis.ifas.ufl.edu/ae536
... Open top chambers for field studies of crop response to elevated CO 2 and temperature. Auteur... more ... Open top chambers for field studies of crop response to elevated CO 2 and temperature. Auteur(s) / Author(s). JONES P. (1) ; COLLINS LM (1) ; INGRAM KT ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). ... Microclimatologie. ; Plante céréalière. ; Gaz effet serre. ; ...
Educational products and resources for agricultural health and safety, available from four Southe... more Educational products and resources for agricultural health and safety, available from four Southeastern universities, are presented. The products are outputs of the Agricultural Health Promotion System (AHPS) cooperative agreements, funded from 1990 to 1994 by the National Institute for Occupational Safety and Health (NIOSH). Cooperative Extension Services (CESs) of the respective universities developed educational materials and dissemination strategies for Extension
An interactive simulation model of small-volume plant growth chambers was developed for use in im... more An interactive simulation model of small-volume plant growth chambers was developed for use in improving the algorithms needed for computerized real-time enviromental control. The model is useful in studying variations between actual, measured and periodically sampled state variables and how different sampling frequencies affect control errors.
The current climate of opinion in both the residential and commercial sectors for new and existin... more The current climate of opinion in both the residential and commercial sectors for new and existing building stock gives a prominent role to energy efficiency as a policy tool. Executive and legislative branches of government at both the state and federal levels are considering and adopting policy options to valorize energy efficiency in the service of everything from national security to curbing global warming to creating a green economy. While the authors support this activity, it should be noted that actual evidence regarding the benefits or outcomes of most funding initiatives or policy activity in this area remains difficult to assess meaningfully. In this article, the authors stress the need for validation of post-occupancy performance and demonstration of persistence of energy efficiency benefits attributable to energy efficiency initiatives and policy activities, and suggest a methodology to assess actual performance using a well-known green building rating system for homes.
ABSTRACT Complete mass balances of CO//2 and H//2O were maintained on six soybean canopies grown ... more ABSTRACT Complete mass balances of CO//2 and H//2O were maintained on six soybean canopies grown in sunlight at two CO//2 treatment levels, 330 and 660 mu mol mol** minus **1. In each set of CO//2 treatments, the three canopies were differentially watered to create one non-stressed canopy and two water stressed canopies. Seasonal balances were based on daily integrated values of transpiration, daytime CO//2 exchange and nighttime CO//2 exchange. On average, the high CO//2 canopies transpired about 10% less water over the season than did the low CO//2 canopies. Cumulative seasonal net CO//2 exchange rate correlated linearly and positively with seasonal biomass accumulation and seed yield. Whole canopy results are based on the continuous competent operation of the environmental chamber system throughout the 108 day season and confirm the unique utility of this research tool.
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