The Agricultural Policy Environmental Extender Apex Model

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The Agricultural Policy Environmental EXtender (APEX) Model

Author :
Publisher :
ISBN 13 :
Total Pages : 109 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis The Agricultural Policy Environmental EXtender (APEX) Model by :

Download or read book The Agricultural Policy Environmental EXtender (APEX) Model written by and published by . This book was released on 2009 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Agricultural Policy Environmental eXtender (APEX) model was developed by the Blacklands Research and Extension Center in Temple, Texas. APEX is a flexible and dynamic tool that is capable of simulating a wide array of management practices, cropping systems, and other land use across a broad range of agricultural landscapes, including whole farms and small watersheds. The model can be configured for novel land management strategies, such as filter strip impacts on pollutant losses from upslope cropfields, intensive rotational grazing scenarios depicting movement of cows between paddocks, vegetated grassed waterways in combination with filter strip impacts, and land application of manure removal from livestock feedlots or waste storage ponds. A description of the APEX model is provided, including an overview of all the major components in the model. Applications of the model are then reviewed, starting with livestock manure and other management scenarios performed for Livestock and the Environment: A National Pilot Project (NPP), and then continuing with feedlot, pesticide, forestry, buffer strip, conservation practice, and other management or land use scenarios performed at the plot, field, watershed, or regional scale. The application descriptions include a summary of calibration and/or validation results obtained for the different NPP assessments as well as for other APEX simulation studies. Available APEX Geographic Information System-based or Windows-based interfaces are also described, as are forthcoming future improvements and additional research needs for the model.

Evaluation of the APEX Model for Organic and Conventional Management Under Conservation and Conventional Tillage Systems

Author : Kieu Ngoc Le
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.:/5 (793 download)

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Book Synopsis Evaluation of the APEX Model for Organic and Conventional Management Under Conservation and Conventional Tillage Systems by : Kieu Ngoc Le

Download or read book Evaluation of the APEX Model for Organic and Conventional Management Under Conservation and Conventional Tillage Systems written by Kieu Ngoc Le and published by . This book was released on 2011 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluates the performance of the agricultural policy environmental extender (APEX) in predicting crop yield and in simulating surface runoff under organic and conventional management in conservation and conventional tillage systems. Uses APEX to assess the long-term impact of organic and conventionally managed plots on crop yield and surface runoff under conventional and conservation tillage systems. Seeks to prove if APEX can capture the difference between organic management and conventional management (chemical use) under the two tillage systems.

Adaptation to Climate Change Impacts at Farm Level Using Swat and Apex Model

Author : Ashvani Kumar Gosain
Publisher : Independently Published
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.5/5 (68 download)

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Book Synopsis Adaptation to Climate Change Impacts at Farm Level Using Swat and Apex Model by : Ashvani Kumar Gosain

Download or read book Adaptation to Climate Change Impacts at Farm Level Using Swat and Apex Model written by Ashvani Kumar Gosain and published by Independently Published. This book was released on 2020-11-08 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study aimed to reveal that the computer simulation models play an important role in watershed management and decision making. The SWAT (Soil and Water Assessment Tool) model has been used for the hydrologic (watershed level) simulation and APEX (Agricultural Policy/Environmental eXtender) model has been used for crop growth and irrigation simulation (farm level). Both models have been used to simulate crop water requirement in field condition, but at different scales. To achieve this task the SWAT and the APEX models have been used in GIS (Geographical Information Systems) framework.

Evaluation of APEX for Simulating the Effects of Tillage Practices in Tropical Soils

Author : Laura Wilson
Publisher :
ISBN 13 :
Total Pages : 89 pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis Evaluation of APEX for Simulating the Effects of Tillage Practices in Tropical Soils by : Laura Wilson

Download or read book Evaluation of APEX for Simulating the Effects of Tillage Practices in Tropical Soils written by Laura Wilson and published by . This book was released on 2019 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tillage practices on agricultural fields have an impact on not only the amount of soil erosion from the fields, but also on the hydrologic and other environmental characteristics of the land. This erosion takes away soil that is necessary for sustainable agriculture, and the sediment and nutrient removal from the fields can pollute surrounding waterbodies. The Llanos Orientales of Colombia used to be a region of extended savannas and native fragile ecosystems dedicated to extended cattle ranch that has been transitioning to crop production. Agricultural expansion in this area, involving mechanization, could importantly accelerate the degradation of soils, limiting the development of sustainable agricultural systems. As a first step to understand long term effects of different tillage practices on new agricultural areas in the region, this study aims to evaluate the performance of the Agricultural Policy Environmental eXtender (APEX) model to simulate runoff, soil erosion and crop yield from fields under conventional tillage, reduced tillage, and no tillage in the Llanos Orientales of Colombia. Calibrated APEX model predictions were compared against measured runoff, soil loss and crop yield data from row crop plots established in the Experimental Station la Libertad in Colombia under conventional, reduced and no-tillage management. APEX satisfactorily predicted runoff (Nash Sutcliffe Efficiency NSE>0.53, Percent Bias - [PBIAS] 21%) and crop yield for all three tillage systems (NSE0.82, [PBIAS]

Watershed Models

Author : Vijay P. Singh
Publisher : CRC Press
ISBN 13 : 1420037439
Total Pages : 678 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Watershed Models by : Vijay P. Singh

Download or read book Watershed Models written by Vijay P. Singh and published by CRC Press. This book was released on 2010-09-28 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: Watershed modeling is at the heart of modern hydrology, supplying rich information that is vital to addressing resource planning, environmental, and social problems. Even in light of this important role, many books relegate the subject to a single chapter while books devoted to modeling focus only on a specific area of application. Recognizing the

Evaluation of the APEX Model to Simulate Runoff, Sediment, and Phosphorus Loss from Agricultural Fields in Northeast Wisconsin

Author : Forrest Stephen Kalk
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Evaluation of the APEX Model to Simulate Runoff, Sediment, and Phosphorus Loss from Agricultural Fields in Northeast Wisconsin by : Forrest Stephen Kalk

Download or read book Evaluation of the APEX Model to Simulate Runoff, Sediment, and Phosphorus Loss from Agricultural Fields in Northeast Wisconsin written by Forrest Stephen Kalk and published by . This book was released on 2018 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the negative consequences of elevated nutrients in surface water, research in the Lower Fox River Watershed in northeastern Wisconsin has focused on monitoring, quantifying, and defining techniques to reduce nutrient and sediment runoff. To support these efforts, the United States Geological Service and University of Wisconsin – Green Bay have been collecting data during runoff events at edge of field locations for several years. My research uses these critical data to parameterize an Agricultural Policy/Environmental eXtender (APEX) model to predict runoff, nutrient loads, and sediment loads from cropland. Data from three sites were used to both manually and automatically calibrate the model, and six additional sites were used in the validation of the model. I attempted to improve model predictions during snowmelt periods and for estimates of dissolved phosphorus (DP). Results show that the manually calibrated model out-performed the automatically calibrated model in nearly all comparisons. Runoff, sediment, total phosphorus (TP), and dissolved phosphorus (DP) were all successfully calibrated by the manual model. The automatic model only had reasonable estimates for runoff volumes. Validation of both models were poor overall, although several locations produced acceptable results both statistically and when visualized graphically. Generally, estimates of runoff were most successful during model validation, with slightly weaker estimates of sediment, TP, and DP. Simulation of snowmelt periods remained poor. The fraction of TP that's in the soluble form was simulated more realistically in comparison to previous research.

Modelling Soil Erosion by Water

Author : John Boardman
Publisher : Springer Science & Business Media
ISBN 13 : 3642589138
Total Pages : 552 pages
Book Rating : 4.6/5 (425 download)

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Book Synopsis Modelling Soil Erosion by Water by : John Boardman

Download or read book Modelling Soil Erosion by Water written by John Boardman and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: TO THE MODEL EVALUATION 1. MODELLING SOIL EROSION BY WATER l 2 John Boardman and David Favis-Mortlock 1 School of Geography and Environmental Change Unit Mansfield Road University of Oxford Oxford OX1 3TB UK 2 Environmental Change Unit University of Oxford 5 South Parks Road Oxford OX1 3UB UK Introduction This volume is the Proceedings of the NATO Advanced Research Workshop 'Global Change: Modelling Soil Erosion by Water', which was held on II-14th September 1995, at the University of Oxford, UK. The meeting was also one of a series organised by the IGBP 1 GCTE Soil Erosion Network, which is a component of GCTE's Land Degradation Task (3.3.2) (Ingram et aI., 1996; Valentin, this volume). One aim of the GCTE Soil Erosion Network is to evaluate the suitability of existing soil erosion models for predicting the possible impacts of global change upon soil erosion. Due to the wide range of erosion models currently, in use or under development, it was decided to evaluate models in the following sequence Favis-Mortlock et al., 1996): • field-scale water erosion models • catchmenr-scale water erosion models • wind erosion models • models with a landscape-scale and larger focus. As part of this strategy, the first stage of the GCTE validation of field-scale erosion models was carried out at the Oxford NATO-ARW. I A list of Acronyms fonns Appendix A.

GIS Applications in Agriculture, Volume Four

Author : Tom Mueller
Publisher : CRC Press
ISBN 13 : 1439867240
Total Pages : 290 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis GIS Applications in Agriculture, Volume Four by : Tom Mueller

Download or read book GIS Applications in Agriculture, Volume Four written by Tom Mueller and published by CRC Press. This book was released on 2015-03-02 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conservation planning involves targeted management practices and land use decision-making based on careful analysis of landscape limitations in order to protect soil and water resources. Developing solutions to conservation planning is of worldwide interest due to anticipated population growth, growing demand of feedstocks for biofuels, decreasing

Methods of Introducing System Models into Agricultural Research

Author : Lajpat R. Ahuja
Publisher : John Wiley & Sons
ISBN 13 : 0891181806
Total Pages : 480 pages
Book Rating : 4.8/5 (911 download)

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Book Synopsis Methods of Introducing System Models into Agricultural Research by : Lajpat R. Ahuja

Download or read book Methods of Introducing System Models into Agricultural Research written by Lajpat R. Ahuja and published by John Wiley & Sons. This book was released on 2020-01-22 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Why model? Agricultural system models enhance and extend field research...to synthesize and examine experiment data and advance our knowledge faster, to extend current research in time to predict best management systems, and to prepare for climate-change effects on agriculture. The relevance of such models depends on their implementation. Methods of Introducing System Models into Agricultural Research is the ultimate handbook for field scientists and other model users in the proper methods of model use. Readers will learn parameter estimation, calibration, validation, and extension of experimental results to other weather conditions, soils, and climates. The proper methods are the key to realizing the great potential benefits of modeling an agricultural system. Experts cover the major models, with the synthesis of knowledge that is the hallmark of the Advances in Agricultural Systems Modeling series.

APEX Model Application to Assess the Impact of Best Management Practices on Runoff, Erosion, and Phosphorus Export in NE Wisconsin, USA

Author : Garek Holley
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (974 download)

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Book Synopsis APEX Model Application to Assess the Impact of Best Management Practices on Runoff, Erosion, and Phosphorus Export in NE Wisconsin, USA by : Garek Holley

Download or read book APEX Model Application to Assess the Impact of Best Management Practices on Runoff, Erosion, and Phosphorus Export in NE Wisconsin, USA written by Garek Holley and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agroecosystems produce food and grain products for a growing global population. With new available land for farming finite, agriculture field management practices have become more intense. However, greater yield intensity requires increased fertilizer and pesticide inputs to cropping systems, potentially leading to unintentional, negative impacts to the environment. Additionally, tillage practices that decrease soil structure, and post-harvest management routines that leave the soil uncovered, collectively increase field susceptibility to erosional losses to adjacent surface waters. The influx of both free and sediment-bound nutrients into water bodies drives algal blooms, and ultimately, following algal death, oxygen depletion from the water column. The net result of these management choices on surface water bodies is a reduced aesthetic appeal for recreation and the reduction of aquatic biodiversity. The objective of my thesis was to evaluate best management practice (BMP) effectiveness at reducing surface runoff, sediment erosion, and phosphorus export from fields using a calibrated and validated Agricultural Policy/Environmental eXtender (APEX) model. Alternative management practices that I investigated included no-till, inclusion of a standard dairy rotation, planting of cover crops (rye), and implementation of grassed waterways. Each alternative practice was analyzed against common routines such as continuous corn, chisel plowing, and fallow soil post-harvest. The greatest percent reduction in erosion and nutrient exports occurred when fields were transitioned from continuous corn with conventional tillage to no-till. Alternatively, use of multiple BMPs together provided the greatest total reduction of runoff, sediment losses and phosphorus export. The modeled BMP that produced the greatest absolute reduction of phosphorus, sediment, and runoff losses was a standard dairy rotation with cover crops planted in the fall, and inclusion of a grassed waterway. This study is unique, in use of technically advanced edge-of-field monitoring stations to collect surface and subsurface runoff, sediment, and nutrient export from agricultural fields. Calibrated APEX models were found to be effective at demonstrating constituent losses from these fields, and capable of modeling various BMP scenarios. Specifically, this study showed that land managers and farmers would help reduce field losses by implementing BMPs which extend cover, living or non -living, to agricultural cropland soils (i.e. cover crops, and no-till).

Agricultural Policy

Author : Vítor João Pereira Domingues Martinho
Publisher : Springer Nature
ISBN 13 : 3031201302
Total Pages : 156 pages
Book Rating : 4.0/5 (312 download)

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Book Synopsis Agricultural Policy by : Vítor João Pereira Domingues Martinho

Download or read book Agricultural Policy written by Vítor João Pereira Domingues Martinho and published by Springer Nature. This book was released on 2022-11-15 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives insights into the agricultural policies in several countries located in different continents. It is of interest to students, researchers, and policy and decision makers. Given the particularities of agriculture, agricultural policies are indispensable for an adjusted development of farms according to the strategic objectives of each country, namely the socio-economic and environmental ones. The question that often arises is whether the practical effects of the various policy measures are in accordance with their design and what is the effect of these policy instruments among many other causes of structural and technological change. The aim of this book is to describe the main agricultural policies that have been implemented in countries such as the United States of America, Brazil, China, India, South Africa, Australia, as well as the European Union. It also aims to analyse the real impact of these policies on the structural and technological changes of farms in the European Union. As its methodology, the book considers bibliometric analysis, literature review and statistical approaches.

Comparing Soil Datasets with the APEX Model

Author : Andrew M. Monks
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (951 download)

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Book Synopsis Comparing Soil Datasets with the APEX Model by : Andrew M. Monks

Download or read book Comparing Soil Datasets with the APEX Model written by Andrew M. Monks and published by . This book was released on 2016 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Apex and Fuzzy Model Assessment of Environmental Benefits of Agroforestry Buffers for Claypan Soils

Author : G. M. M. M. Anomaa Senaviratne
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (891 download)

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Book Synopsis Apex and Fuzzy Model Assessment of Environmental Benefits of Agroforestry Buffers for Claypan Soils by : G. M. M. M. Anomaa Senaviratne

Download or read book Apex and Fuzzy Model Assessment of Environmental Benefits of Agroforestry Buffers for Claypan Soils written by G. M. M. M. Anomaa Senaviratne and published by . This book was released on 2013 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contamination of surface waters with pollutants from agricultural land is a major threat to the environment. A field-size watershed study in Northeast Missouri showed that vegetated filter strips containing grass and grass+trees (agroforestry) buffers placed on contours reduced sediment and nutrient loadings by 11-35%. Watershed scale studies are overly expensive while computer simulated hydrologic models offer efficient and economical tools to examine environmental benefits of conservation practices. The current study used the Agricultural Policy Environmental eXtender (APEX) model and a fuzzy logic model to predict environmental benefits of buffers and grass waterways of three adjacent watersheds at the Greenley Memorial Research Center. During the second phase of the study, an automated computer technique was developed to optimize parameter sets for the APEX model for runoff, sediment, total phosphorous (TP) and total nitrogen (TN) losses. The APEX model was calibrated and validated satisfactorily for runoff from both pre- and post-buffer watersheds. The sediment, TP, and TN were calibrated only for larger events during the pre-buffer period (>50 mm). Only TP was calibrated by post-buffer models. The models simulated 13- 25% TP reduction by grass waterways, and 4-5% runoff and 13-45% TP reductions by buffers. The fuzzy model predicted runoff for the study watersheds and for watersheds 30 and 50 times larger in northern Missouri. A stepwise multi-objective, multi-variable parameter optimization technique improved calibration of sediments, TP, and TN after optimization for runoff parameters. The results of the study show that models can be used to examine environmental benefits provided long-term data are available.

Synthesis and Modeling of Greenhouse Gas Emissions and Carbon Storage in Agricultural and Forest Systems to Guide Mitigation and Adaptation

Download Synthesis and Modeling of Greenhouse Gas Emissions and Carbon Storage in Agricultural and Forest Systems to Guide Mitigation and Adaptation PDF Online Free

Author : Stephen J. Del Grosso
Publisher : John Wiley & Sons
ISBN 13 : 0891183450
Total Pages : 336 pages
Book Rating : 4.8/5 (911 download)

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Book Synopsis Synthesis and Modeling of Greenhouse Gas Emissions and Carbon Storage in Agricultural and Forest Systems to Guide Mitigation and Adaptation by : Stephen J. Del Grosso

Download or read book Synthesis and Modeling of Greenhouse Gas Emissions and Carbon Storage in Agricultural and Forest Systems to Guide Mitigation and Adaptation written by Stephen J. Del Grosso and published by John Wiley & Sons. This book was released on 2020-01-22 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crop, livestock, and forestry productions systems are important sources and sinks of greenhouses gases, but estimates of the magnitude of gas fluxes are more uncertain than those for other economic sectors such as transportation and electricity generation. Recent improvements in process-level un-derstanding, modeling software, and observational data used for model testing have increased the accuracy of model predictions, but substantial uncertainty remains, particularly regarding the potential for different management practices to mitigate emissions. The chapters in this volume demonstrate that both simple methods and complex models have strengths and limitations depending on stake-holder interest, scale of application, and other factors. Future improvement can be facilitated by or-ganizing model input and testing data into web-accessible databases and by making model algorithms more available and transparent.

Air Pollution Modeling and its Application XXI

Author : Douw G. Steyn
Publisher : Springer Science & Business Media
ISBN 13 : 9400713584
Total Pages : 750 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Air Pollution Modeling and its Application XXI by : Douw G. Steyn

Download or read book Air Pollution Modeling and its Application XXI written by Douw G. Steyn and published by Springer Science & Business Media. This book was released on 2011-10-09 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in air pollution modeling and its application are explored here in contributions by researchers at the forefront of their field. The book is focused on local, urban, regional and intercontinental modeling; data assimilation and air quality forecasting; model assessment and evaluation; aerosol transformation; the relationship between air quality and human health and the effects of climate change on air quality. The work will provide useful reference material for students and professors interested in air pollution modeling at the graduate level as well as researchers and professionals involved in developing and utilizing air pollution models.

Soil Carbon Dynamics in Indian Himalayan Region

Author : Gaurav Mishra
Publisher : Springer Nature
ISBN 13 : 981993303X
Total Pages : 390 pages
Book Rating : 4.8/5 (199 download)

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Book Synopsis Soil Carbon Dynamics in Indian Himalayan Region by : Gaurav Mishra

Download or read book Soil Carbon Dynamics in Indian Himalayan Region written by Gaurav Mishra and published by Springer Nature. This book was released on 2024-01-08 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributed volume assimilates the knowledge, experience, and exciting aspects of soil carbon research in the Indian Himalayan region. It includes different aspects and factors associated with soil carbon sequestration in the region, one of the biodiversity hot spots and highly vulnerable to climatic change impacts. Information on different aspects of soil organic carbon dynamics concerning adaptive land management practices and anthropogenic impacts is covered. Further topics include applying advanced tools and techniques to soil carbon vis-a-vis soil erosion research. This book is of interest to researchers and policymakers involved in soil carbon research and offer ideas to enhance the soil carbon in the region concerned. In addition, the book will provide up-to-date information for researchers interested in soil carbon research for the maintenance of soil quality and fertility in the climate-vulnerable Indian Himalayan region.

Water Quality and Agriculture

Author : James Shortle
Publisher : Springer Nature
ISBN 13 : 3030470873
Total Pages : 410 pages
Book Rating : 4.0/5 (34 download)

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Book Synopsis Water Quality and Agriculture by : James Shortle

Download or read book Water Quality and Agriculture written by James Shortle and published by Springer Nature. This book was released on 2021-06-12 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water pollution control has been a top environmental policy priority of the world’s most developed countries for decades, and the focus of significant regulation and public and private spending. Yet, significant water quality problems remain, and trends for some pollutants are in the wrong direction. This book addresses the economics of water pollution control and water pollution control policy in agriculture, with an aim towards providing students, environmental policy analysts, and other environmental professionals with economic concepts and tools essential to understanding the problem and crafting solutions that can be effective and efficient. The book will also examine existing policies and proposed reforms in the developed world. Although this book addresses and has a general applicability to major water pollutants from agriculture (e.g., pesticides, pharmaceuticals, sediments, nutrients), it will focus on the sediment and nutrient pollution problem. The economic and scientific foundations for pollution management are best developed for these pollutants, and they are currently the top priorities of policy makers. Accordingly, the authors provide both highly salient and informative cases for developing concepts and methods of general applicability, with high profile examples such as the Chesapeake Bay, Lake Erie, and the Gulf of Mexico Dead Zone in the US; the Baltic Sea in Northern Europe; and Lake Taupo in New Zealand.