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| Registros recuperados: 1.004 | |
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| Vazin,F.. |
| The aim of this study was to determine the economic damage threshold of Pigweed redroot for corn regarding its density. An experiment was conducted at the Agriculture Research station of Islamic Azad University branch of Gonabad during 2006. The experiment was carried out as a factorial in a randomized complete block design with three replications. In the experiments, the factors included corn (var. 704) densities of 7.5, 8.5 and 9.5 plants m-2 and pigweed redroot densities of 0, 2, 4, 6 and 8 plants m-2. The increase in Pigweed redroot density, decrease in crop grain and biomass yield components such as ear length, ear diameter, number of grains per row, row number, grain number in ear, grain yield and biological yield of corn, decreased. Also, with an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Economic thresholds; Weed competition; Pigweed redroot; Corn. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000300003 |
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| Matallo,M.B.; Almeida,S.D.B.; Franco,D.A.S.; Cerdeira,A.L.; Gazzeiro,D.L.P.. |
| Oseltamivir phosphate is a potent viral inhibitor produced from shikimic acid extracted from seeds of Ilicium verum, the most important natural source. With the site of action 5-enolpyruvylshikimate-3-phosphate synthase (EPSP), glyphosate is the only compound capable of inhibiting its activity with the consequent accumulation of shikimic acid in plants. Corn and soybean plants were sprayed with reduced rates of glyphosate (0.0 to 230.4 g a.i. ha¹) and shikimic acid content in the dry mass was determined by HPLC 3, 7 and 10 days after application. Results showed shikimic acid accumulation in dry mass with increases of up to 969% in corn and 33,000% on soybeans, with peak concentrations 3 days after treatment (DAT). Industrial feasibility for shikimic acid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicides; Corn; Soybean; Oseltamivir; Pandemics; HPLC. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300016 |
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| Mafioletti, Robson; Bragagnolo, Cassiano; Sbrissia, Gustavo Fischer; Ferreira, Giovani; Loyola, Pedro. |
| O trabalho teve como objetivo estimar a safra paranaense, que somando as culturas da soja e do milho foi recorde chegando em 2007/08 a 21,2 milhões de toneladas, aliado a isso tem-se uma situação favorável de preços internacionais, que gera resultados positivos para o setor produtivo e permite a recuperação do setor que passou por anos complicados por problemas climáticos e de preços. A estimativa da safra foi realizada com uma amostra de dados que representam 78% da área de soja e 61% da área de milho do Estado do Paraná. Quanto as questões relacionadas a biotecnologia – soja transgênica – RR, os resultados foram os esperados, de que essa é mais uma tecnologia disponível ao produtor e esta evoluindo para ser cada vez mais competitiva com a soja... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Soja; Milho; Expedição; Preços; Biotecnologia; Soybean; Corn; Expedition; Prices; Biotecnology; Crop Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/109453 |
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| Taylor, Richard D.; Mattson, Jeremy W.; Andino, Jose; Koo, Won W.. |
| This report evaluates the U.S. corn sector, especially changes in ethanol production. This analysis is based on a series of assumptions about general economic conditions, agricultural polices, weather conditions, and technological change. Changes in ethanol production will impact the production, feed use, and exports of corn, as well as the general price level. Federally mandated ethanol usage dictates the growth of ethanol production in the United States. Other factors have limited impact on corn price. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ethanol; Government subsidies; Feed use; Corn; Exports; Crop Production/Industries; Resource /Energy Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/23512 |
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| Fabiosa, Jacinto F.; Beghin, John C.; Dong, Fengxia; Elobeid, Amani E.; Tokgoz, Simla; Yu, Tun-Hsiang (Edward). |
| We quantify the emergence of biofuel markets and its impact on U.S. and world agriculture for the coming decade using the multi-market, multi-commodity international FAPRI (Food and Agricultural Policy Research Institute) model. The model incorporates the trade-offs between biofuel, feed, and food production and consumption and international feedback effects of the emergence through world commodity prices and trade. We examine land allocation by type of crop, and pasture use for countries growing feedstock for ethanol (corn, sorghum, wheat, sugarcane, and other grains) and major crops competing with feedstock for land resources such as oilseeds. We shock the model with exogenous changes in ethanol demand, first in the United States, then in Brazil, China,... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Acreage; Area; Biofuel; Corn; Crops; Ethanol; FAPRI model; Feedstock; Land; Sugar; Sugarcane.; Agricultural and Food Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/48598 |
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| Archer, David W.; Gesch, Russell W.. |
| The value of an innovative seed technology is estimated in a discrete stochastic programming framework for a representative farm in the northern Corn Belt. Temperature-activated polymer-coated seed has the potential to increase net returns by increasing yields due to early planting and use of longer season varieties, as well as reducing yield due to early planting and use of longer season varieties, as well as reducing yield loss due to delayed planting. A biophysical simulation model was used to estimate the impact of polymer-coated seed on corn and soybean yields and on field day availability for five planting periods, three crop varieties, and two tillage systems on two different soils under varying weather conditions. |
| Tipo: Journal Article |
Palavras-chave: Biophysical simulation; Corn; Mathematical programming; Soybean; Q12; C61. |
| Ano: 2003 |
URL: http://purl.umn.edu/43198 |
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| Cooper, Joseph C.; Langemeier, Michael R.; Schnitkey, Gary D.; Zulauf, Carl R.. |
| Yield variability can be significantly higher at the farm level than at more aggregated levels, including the county. However, due to a dearth of available farm level data, much stochastic analysis involving farm yields utilizes more aggregated yield data as a proxy for the farm level. We empirically evaluate farm-level variability using longitudinal farm level data sets available from the Kansas Farm Management Association and the Illinois Farm Business and Farm Management Association. For corn, soybeans, and wheat, we compare the farm level yield variability obtained from this data to that inferred from Federal crop insurance premiums. The farm management data exhibit lower yield variability than are implied by the crop insurance premiums. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Yield variability; Crop insurance; Corn; Wheat; Soybeans; Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty. |
| Ano: 2009 |
URL: http://purl.umn.edu/49216 |
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| Paulson, Nicholas D.; Babcock, Bruce A.. |
| The production literature has shown that inputs such as fertilizer can be defined as risk-increasing. However, farmers also consistently overapply nitrogen. A model of optimal input use under uncertainty is used to address this paradox. Using experimental data, a stochastic production relationship between yield and soil nitrate is estimated. Numerical results show that input uncertainty may cause farmers to overapply nitrogen. Survey data suggest that farmers are risk averse, but prefer small chances of high yields compared to small chances of crop failures when expected yields are equivalent. Furthermore, yield risk and yield variability are not equivalent. |
| Tipo: Journal Article |
Palavras-chave: Corn; Nitrogen fertilizer; Risk-increasing; Yield risk; Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/97853 |
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| Urcola, Hernan A.; Irwin, Scott H.. |
| A growing body of recent evidence suggests that premiums for financial options might be too high. For agricultural options, market participants often make similar claims, however there is very limited scientific literature to prove or disprove such claims. This research investigates the efficiency of corn and soybean options markets by directly computing trading returns. Time effects on market efficiency are also investigated. When the sample period is considered as a whole, risk adjusted returns indicate that no profits can be made by taking either side of the corn or soybean options markets. However, when time effects are analyzed, corn calls appear to have provided excess returns during the 1998--2005 period. This result do not appear to be driven by... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Corn; Soybeans; Options markets; Mispricing; Trading returns; Market efficiency; Crop Production/Industries; Marketing. |
| Ano: 2006 |
URL: http://purl.umn.edu/19006 |
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| Registros recuperados: 1.004 | |
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