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Measuring Volatility in Dairy Commodity Prices AgEcon
O'Connor, Declan; Keane, Michael; Barnes, Edel.
The policy environment facing the EU dairy industry continues to undergo considerable change under WTO and CAP reform. Movement away from supply management by the EU and a more liberal global agricultural trading system will involve greater price volatility for dairy commodities. It is anticipated that EU dairy prices will more closely align with world prices. World prices are both lower and more volatile than EU prices and it is further assumed that this increased volatility will be transmitted to EU prices. Price volatility is a concern for a number of reasons as it adds challenges for business planning, debt repayment, and, in some cases, solvency. Representative EU and world butter and SMP (Skim Milk Powder) prices are considered and using the ARMA and...
Tipo: Conference Paper or Presentation Palavras-chave: Price Volatility; ARMA; GARCH; Butter; SMP; Dairy Policy; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety.
Ano: 2009 URL: http://purl.umn.edu/58106
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Accuracy of methods to estimate potential acidity and lime requirement in soils of west region of Santa Catarina Ciência Rural
Predebon,Rodrigo; Gatiboni,Luciano Colpo; Mumbach,Gilmar Luiz; Schmitt,Djalma Eugenio; Dall’Orsoletta,Daniel João; Brunetto,Gustavo.
ABSTRACT: The objective of this study was to compare two methods of evaluation of potencial acidity (H+Al) and two methods to estimate liming requirement (LR) for soils from the west region of Santa Catarina State, Brazil. Fourteen soils were incubated with 7 lime rates for 120 days, obtaining the real values of H+Al at pH 7.0 and LR. These values were used as reference to evaluate the accuracy of two H+Al estimating methods: SMP buffer and calcium acetate at pH 7.0, and to evaluate the accuracy of two LR methods: base saturation (BS) and SMP index. On average, H+Al was underestimated in 6 and 40% by SMP and calcium acetate methods, respectively, especially in soils with high buffer capacity. The LR was underestimated in 20 and 30% by SMP index and BS,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: SMP; Calcium acetate; Base saturation; Liming.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400253
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