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Registros recuperados: 31
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A SYSTEMS APPROACH FOR EVALUATING ON-FARM SITE-SPECIFIC MANAGEMENT TRIALS: A CASE STUDY WITH VARIABLE RATE MANURE AND CROP QUALITY RESPONSE TO INPUTS AgEcon
Lambert, Dayton M.; Lowenberg-DeBoer, James; Malzer, Gary L..
Site-specific application of manure has the potential to improve crop production and environmental quality. If manure is applied where it is needed, in the quantity required by the crop, over application, with attendant runoff and leaching problems can be reduced. To implement this approach growers need site-specific crop response information. Increasing availability of site-specific yield information offers a way to estimate such crop responses. The objective of this study is to develop a methodology for estimating site-specific response of corn and soybeans to manure given soil test information, and to use that methodology to analyze an on-farm manure management trial conducted near Sleepy Eye, Minnesota. Both quantity and quality of the crop is...
Tipo: Conference Paper or Presentation Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004 URL: http://purl.umn.edu/20091
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A SYSTEMS APPROACH INCORPORATING SOIL TEST INFORMATION INTO SITE-SPECIFIC MANURE MANAGEMENT RECOMMENDATIONS AgEcon
Lambert, Dayton M.; Malzer, Gary L.; Lowenberg-DeBoer, James.
Replaced with revised version of paper 04/28/04.
Tipo: Working or Discussion Paper Palavras-chave: Crop Production/Industries.
Ano: 2003 URL: http://purl.umn.edu/28623
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ADOPTION, PROFITABILITY, AND MAKING BETTER USE OF PRECISION FARMING DATA AgEcon
Lambert, Dayton M.; Lowenberg-DeBoer, James; Griffin, Terry W.; Peone, J.; Payne, Tim; Daberkow, Stan G..
Precision agriculture (PA) technology has been on the market for over ten years. Global Positioning Systems (GPS), Geographic Information Systems (GIS), yield monitors, variable rate technologies (VRT) and other spatial management technologies are being used by farmers worldwide, but questions remain about the profitability of the technology and its future. This paper summarizes: 1) data on adoption of PA technology worldwide, 2) review of PA economics studies and 3) efforts to make better use of yield monitor and other sensor data in crop management. The adoption estimates are based on reports by an international network of collaborators. This paper draws on USDA ARMS data to update U.S. PA adoption numbers. The PA profitability summary goes beyond...
Tipo: Working or Discussion Paper Palavras-chave: Agribusiness.
Ano: 2004 URL: http://purl.umn.edu/28615
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AN INITIAL INVESTIGATION OF THE POTENTIAL FOR HERMETIC PURDUE IMPROVED CROP STORAGE (PICS) BAGS TO IMPROVE INCOMES FOR MAIZE PRODUCERS IN SUB-SAHARAN AFRICA AgEcon
Jones, Michael; Alexander, Corinne E.; Lowenberg-DeBoer, James.
Pests like the larger grain borer (P. truncatus) and the maize weevil (S. zeamis) cause significant storage losses for African maize producers. The value of storage protection to a market-oriented farmer is a function of price seasonality, value loss prevention, and their opportunity costs of capital. Evidence suggests that hermetic technologies like Purdue Improved Crop Storage (PICS) bags can be effective against these key maize storage pests, but sustainable technology transfer requires that it be profitable for producers. This analysis references dry weight loss figures from key life science articles and builds on previous value loss research to provide a geographic model for potential storage technology adoption. PICS bag profitability with one and...
Tipo: Working or Discussion Paper Palavras-chave: Agricultural pests; Technology adoption; Maize; Larger grain borer; Hermetic storage; Storage economics; Agribusiness; International Development; Research and Development/Tech Change/Emerging Technologies; Q16; Q13; O33.
Ano: 2011 URL: http://purl.umn.edu/115554
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Case Study of On-Farm Experiments and Farm Management Decision Making AgEcon
Griffin, Terry W.; Dobbins, Craig L.; Lowenberg-DeBoer, James.
Tipo: Conference Paper or Presentation Palavras-chave: Farm Management.
Ano: 2007 URL: http://purl.umn.edu/9921
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CONSUMER ACCEPTANCE OF GMO COWPEAS IN SUB-SAHARA AFRICA AgEcon
Kushwaha, Saket; Musa, A.S.; Lowenberg-DeBoer, James; Fulton, Joan R..
Cowpea is the most important indigenous African grain legume for both home use and as a cash crop. Because of its tolerance to drought it is especially important for the Sahel. Genetic transformation of cowpea with Bachilius Thurengius (Bt) genes to control pod boring insects has many advantages, but little is known of the potential consumer response. This paper analyzes and reports the results of a survey of 200 consumers in northern Nigeria in early 2003 concerning consumer awareness of and acceptance of biotechnology. Ninety percent of the respondents were aware of GM products. Those respondents who were most concerned about the ethics of genetic transformation were likely to disapprove of such products, while those individuals who identified...
Tipo: Conference Paper or Presentation Palavras-chave: Institutional and Behavioral Economics.
Ano: 2004 URL: http://purl.umn.edu/20216
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Consumer preferences as drivers of the common bean trade in Tanzania: A marketing perspective AgEcon
Mishili, Fulgence J.; Temu, Anna A.; Fulton, Joan R.; Lowenberg-DeBoer, James.
The objective of this study was to determine the impact of bean grain quality characteristics on market price. The data was collected from retail markets in Tanzania. Hedonic pricing provides a statistical estimate of premiums and discounts. Implications for development of bean markets include: i) extension agents should identify cost-effective ways to educate producers on targeting urban market niches based on consumer preferences for varieties, ii) breeding for bruchid resistant beans and use of appropriate storage technologies would alleviate the problems of storage damage, and iii) requiring a portfolio of grain quality characteristics to fit consumer preferences in local markets.
Tipo: Journal Article Palavras-chave: Beans; Markets; Consumer preferences; Hedonic; Storage; Tanzania; Marketing; D12; Q13.
Ano: 2009 URL: http://purl.umn.edu/48658
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CONSUMER PREFERENCES AS DRIVERS OF THE COMMON BEAN TRADE IN TANZANIA: A MARKETING PERSPECTIVE AgEcon
Mishili, Fulgence J.; Temu, Anna A.; Fulton, Joan R.; Lowenberg-DeBoer, James.
The objective of this study was to determine the impact of bean grain quality characteristics on market price. The data was collected from retail markets in Tanzania. Hedonic pricing provides a statistical estimate of premiums and discounts. Implications for development of bean markets include: i) extension agents should identify cost-effective ways to educate producers on targeting urban market niches based on consumer preferences for varieties, ii) breeding for bruchid resistant beans and use of appropriate storage technologies would alleviate the problems of storage damage, and iii) requiring a portfolio of grain quality characteristics to fit consumer preferences in local markets.
Tipo: Working or Discussion Paper Palavras-chave: Beans; Markets; Consumer preferences; Hedonic; Storage; Tanzania; Consumer/Household Economics; Demand and Price Analysis; Marketing; D12; Q13.
Ano: 2009 URL: http://purl.umn.edu/48644
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CONSUMER PREFERENCES FOR QUALITY CHARACTERISTICS ALONG THE COWPEA VALUE CHAIN IN NIGERIA, GHANA AND MALI AgEcon
Mishili, Fulgence J.; Fulton, Joan R.; Shehu, Musa; Kushwaha, Saket; Marfo, Kofi; Jamal, Mustafa; Chergna, Alpha; Lowenberg-DeBoer, James.
The production and trade of cowpea (Vigna Uniculata), called "blackeyed peas" in the US, are a growing business for farmers and merchants serving the rapidly expanding urban areas of West and Central Africa. Cowpea fits the needs of the urban poor. It is an inexpensive source of protein that does not require refrigeration. A better understanding of consumer preferences for cowpea is essential to market development. The main objective of the study was to determine the cowpea grain quality characteristics that command a price premium or provoke a discount in Ghanaian, Malian and Nigerian markets. Specifically, the study looked at the impact of the grain size, texture, color, eye color, and bruchid-damaged grains on cowpea market prices. The data for the...
Tipo: Working or Discussion Paper Palavras-chave: Consumer/Household Economics.
Ano: 2007 URL: http://purl.umn.edu/28684
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Drainage water management impact on farm profitability AgEcon
Nistor, Adela P.; Lowenberg-DeBoer, James.
The representative farm planning model that is used for the 2005 Purdue University Top Farmer Crop Workshop base case was extended to include managed drainage activities in order to evaluate the impact of drainage management time on farm operations. The analysis considered two alternative enterprises: rotation corn – soybeans with and without controlled drainage activities. The baseline solution assumed that controlled drainage has 10% higher average yields than free flowing drainage, one drainage control structure is needed each 20 acres, and all drainage management work was done on good field days. The results suggest that the baseline optimal solution was rotation corn-soybeans with controlled drainage where 1,500 acres were cultivated with corn...
Tipo: Conference Paper or Presentation Palavras-chave: Farm Management.
Ano: 2006 URL: http://purl.umn.edu/21389
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Economic Analysis of Phosphorus Applications under Variable and Single-Rate Applications in the Bothaville District AgEcon
Maine, Ntsikane; Nell, Wilhelm T.; Lowenberg-DeBoer, James; Alemu, Zerihun Gudeta.
Variable-rate (VR) application of inputs in South African cash crop production is mainly concerned with fertilizer and lime, and this indicates the importance of these inputs in cash crop production. However, the profitability of VR application of inputs has not yet been investigated under South African conditions. This paper studies the maize yield response to variable-rate application of phosphorus (P) and the profitability thereof in South Africa, on the basis of data collected on a 104-hectare experimental field on a farm in the Bothaville district. The strip-plot design of 180 strips was used for this on-farm research experiment. This design involved treatments that run in the same direction across the field as planting and harvesting. The objective...
Tipo: Journal Article Palavras-chave: Precision agriculture; Precision farming; Site-specific phosphorus management; Variable-rate application; Fertilizer; Yield response; South Africa; Crop Production/Industries.
Ano: 2007 URL: http://purl.umn.edu/7047
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ECONOMICS OF VARIABLE RATE PLANTING FOR CORN AgEcon
Lowenberg-DeBoer, James.
This analysis works out the economic implications for variable rate seeding of the corn population response curves estimated by Pioneer Hi-Bred agronomists. Examples are developed for various mixes of low, medium and high yield potential soil, as well as for a range of seed costs and variable rate equipment costs. The strategies analyzed were: variable rate planting using agronomic recommendations for each yield potential zone, variable rate planting using an economic decision rule for each yield potential zone, an information strategy which sets the uniform planting rate at the highest population indicated by agronomic recommendations for any part of the field and a second information strategy which uses an economic decision rule for the whole field based...
Tipo: Working or Discussion Paper Palavras-chave: Precision farming; Variable rate; Corn; GPS; Production economics; Crop Production/Industries.
Ano: 1998 URL: http://purl.umn.edu/28685
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Evaluating the Effectiveness of Alternative Extension Methods: Triple-Bag Storage of Cowpeas by Small-Scale Farmers in West Africa AgEcon
Moussa, Bokar; Otoo, Miriam; Fulton, Joan R.; Lowenberg-DeBoer, James.
This study examined two questions related to the adoption of triple-bag storage technology for farmers storing cowpeas in West Africa. First the effect of an extension program, focused on village demonstrations, on adoption was considered. Second, the effect of radio messages to augment this extension program was analyzed. The results indicate that adoption was positively affected by the extension program and radio messages do augment the effectiveness.
Tipo: Conference Paper or Presentation Palavras-chave: Effective extension methods; Cowpeas; Hermetic storage; Teaching/Communication/Extension/Profession.
Ano: 2009 URL: http://purl.umn.edu/49448
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Ex Ante Economic Impact of Genetically Modified (GM) Cowpea in Benin AgEcon
Dofonsou, Sika Gbegbelegbe; Lowenberg-DeBoer, James; Adeoti, Razack; Coulibaly, Ousmane; Lusk, Jayson L..
The net impact of pest-resistant GM crops on the welfare of both producers and consumers in developing countries is currently unknown and subject to speculation. This study uses choice-based conjoint protocol to estimate the net impact of pest-resistant Genetically Modified (GM) cowpea on net social welfare in Benin given price and income risks. Results imply that Bt cowpea will increase expected net social welfare by about $US 50 million per year in Benin given no inefficiencies in the seed sector. If inefficiencies in the seed sector are such that cowpea growers can access Bt cowpea seeds only 50% of the time, net benefits from Bt cowpea drop to about $US 11 million per year.
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 2007 URL: http://purl.umn.edu/9817
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EX ANTE NON-MARKET VALUATION FOR NOVEL PRODUCT: LITERATURE REVIEW AgEcon
Dofonsou, Sika Gbegbelegbe; Lowenberg-DeBoer, James.
This paper provides a critical review of the literature on non-market valuation methods to estimate the welfare impact of novel products; it is the first study to assess both observed data- and perception-based methods as non-market valuation methods. Observed databased methods include budgets, regression, mathematical programming, and simulation. Perceptions-based methods include the contingent valuation method, choice-based conjoint analysis and experimental methods. Findings imply that the preferred observed data-based method to estimate the ex ante economic impact of a new technology on the welfare of the farm household is a combination of simulation and mathematical programming. The preferred perception-based method for estimating the ex ante impact...
Tipo: Working or Discussion Paper Palavras-chave: Staff working papers; Dept. of Agricultural Economics; Internet publications; Purdue University; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; B0; B4; C0; C6; R2.
Ano: 2008 URL: http://purl.umn.edu/6327
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Factors Affecting Success for Women Entrepreneurs in West Africa: The Case of Kosai, a Value Added Cowpea Product AgEcon
Ibro, Germaine; Fulton, Joan R.; Lowenberg-DeBoer, James.
Kosai, a deep-fat fried fritter made from cowpea, is an important product for economic development and poverty alleviation. Kosai is sold as street food almost exclusively by women entrepreneurs who use the money they earn from selling kosai on savings and daily expenditures for their family. In addition, cowpea is the more important indigenous African legume and kosai production uses a significant amount of cowpea. Data was collected, via personal interviews, with about 400 vendors in three different cities in the West African country of Niger. Results revealed that vendors with more experience were more likely to be successful.
Tipo: Conference Paper or Presentation Palavras-chave: Community/Rural/Urban Development.
Ano: 2006 URL: http://purl.umn.edu/21160
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Field-Scale Experimental Designs and Spatial Econometric Methods for Precision Farming: Strip-Trial Designs for Rice Production Decision Making AgEcon
Griffin, Terry W.; Florax, Raymond J.G.M.; Lowenberg-DeBoer, James.
Site-specific data is spatially variable, precluding traditional econometric analysis. Some field-scale experimental designs present logistical, operational and mathematical problems in estimating treatment differences, specifically when adjacent observations are of different treatments such as with strip-trial designs. A modified spatial interaction structure is presented to analyze strip-trial designs with spatial econometrics.
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 2006 URL: http://purl.umn.edu/35367
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GENERAL MOMENT AND QUASI-MAXIMUM LIKELIHOOD ESTIMATION OF A SPATIALLY AUTOCORRELATED SYSTEM OF EQUATIONS: AN EMPIRICAL EXAMPLE USING ON-FARM PRECISION AGRICULTURE DATA AgEcon
Lambert, Dayton M.; Malzer, Gary L.; Lowenberg-DeBoer, James.
This paper compares two estimation methods of a three-stage least squares (3SLS) system of equations, corrected for spatial autocorrelation. The modeling approach is novel in that it is an extension of Anselin's (1988) seemingly unrelated regression (SUR) space-time spatial error model for panel data. An empirical comparison of the quasi-maximum likelihood (QML) estimation of the equation system, and Kelejian and Prucha's general moments (GM) estimation approach is presented. The model and estimation procedures introduced in this study are easily extended to other economic, agronomic, or biological models that must incorporate spatial and temporal effects in the model specification, and overcome simultaneous equation bias. The empirical example used in...
Tipo: Working or Discussion Paper Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004 URL: http://purl.umn.edu/28667
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MANAGING PHOSPHOROUS SOIL DYNAMICS OVER SPACE AND TIME AgEcon
Lambert, Dayton M.; Lowenberg-DeBoer, James; Malzer, Gary L..
Understanding the relationship between soil fertility dynamics and crop response is conceptually appealing. Even more appealing is comprehension of the spatial and temporal heterogeneity of these connections over a production surface and across seasons. Knowledge of these interactions is complicated because nutrient carryover dynamics and crop response to inputs are determined simultaneously on the one-hand, and sequentially on the other. A second problem enters when crops are rotated, for example, in the corn-soybean system commonly practiced in the Corn Belt. This paper examines the nutrient carryover-crop response nexus using data from a corn-soybean, variable-rate nitrogen (N) and phosphorous (P) experiment conducted over five years. Site-specific corn...
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 2005 URL: http://purl.umn.edu/19452
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OPTIMAL ROW WIDTH FOR CORN AND SOYBEAN AgEcon
Lambert, Dayton M.; Lowenberg-DeBoer, James.
Soybean production in narrow rows is not a novel idea. Wiggans (1939) reported yield advantages of drilled soybeans in narrow rows (8-inches) over soybeans planted in 28-inch rows. However, farmers, consultants, and extension agents face a bewildering array of information regarding optimal row widths intended to maximize return from corn and soybeans during a growing cycle. This information is further complicated by the choices of planting equipment specialized for certain row widths. That soybeans planted in narrow rows generally out-yield soybean produced in wider rows is well documented. However, what is not clear is which narrow row width consistently and significantly outperforms other widths, yield-wise and return-wise, in which regions (Devlin...
Tipo: Working or Discussion Paper Palavras-chave: Crop Production/Industries.
Ano: 2001 URL: http://purl.umn.edu/28681
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