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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Wheat moisture determination by 1- to 110-MHz swept-frequency admittance measurements  [1998]

Lawrence, K.C. (USDA, ARS, Richard B. Russell Agricultural Research Center, Athens, GA.); Windham, W.R.; Nelson, S.O.;

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A technique is presented for rapidly determining the moisture content of hard red winter wheat, Triticum aestivum L., independent of grain bulk density. Complex admittance measurements from 1 to 110 MHz on bulk wheat samples were collected for predicting moisture contents ranging from about 9% to 20%, wet basis, in samples with densities ranging from 0.620 to 0.790 g/cm3. The data were transformed to density-independent function (DIF) values, and multivariate analysis was used to eliminate spectral and statistical outliers. Principal component analysis was also used to determine the optimum frequencies for predicting moisture content with the DIF values. Partial least-squares regression was then used to develop a calibration based on measurements at three frequencies of about 2, 25, and 80 MHz. Calibration was performed with 47 wheat samples representing six cultivars harvested in 1991 and 1992 with a standard error of cross validation of 0.34% moisture content, and validation was tested on 146 different samples from the same cultivars. Predicted moisture contents compared well with values determined by air oven drying with a standard error of performance of 0.39% moisture content and a bias of +0.03%

Журнал

Transactions of the ASAE (USA)

ISSN : 0001-2351