Instrumental Techniques for Measuring Quality of Agricultural Crops
Many instrumental techniques have been developed for measuring the quality of agricultural products. However, instrumentation specialists often feel frustrated in this effort because quality as related to agricultural products is difficult to define in terms of physical parameters which can be readily quantified. In general, it is the chemical composition of the product which really determines the quality, but most often, we define the quality by our senses of sight, touch, or smell, rather than by the composition. It has been our experience that it is much easier to develop techniques to measure composition than it is to measure quality. Therefore, this paper will concentrate on the measurement of composition as a means of indicating quality. Spectrophotometry by transmission, reflectance, and fluorescence offers the best technology for instrumental measurement of composition, so we will examine the visible and near-infrared region of the spectrum for this purpose.
KeywordsGallium Arsenide Difference Curve Instrumental Technique Lead Sulfide Corn Kernel
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- Ben Gera, I. and Norris, K. H., 1968, Determination of moisture content in soybeans by direct spectrophotometry, Israel J. Agric. Res. 18:125.Google Scholar
- Birth, G. S. and Olsen, K. L., 1964, Nondestructive detection of water core in Delicious apples, Proc. Amer. Soc. Hort. Sci. 85:74.Google Scholar
- Birth G. S. and Norris, K. H., 1965, The difference meter for measuring interior quality of foods and pigments in biological tissues, USDA Tech. Bull. No. 1341.Google Scholar
- Finney, E. E. and Norris, K. H., 1978, Determination of moisture in corn kernels by near-infrared-transmittance measurements, Trans. ASAE 21:581.Google Scholar
- Massie, D. R., 1976, Fat measurement of ground beef with a gallium arsenide infrared emitter, in: “Quality Detection in Foods,” ASAE Publication.Google Scholar
- Massie, D. R. and Norris, K. H., 1975, A high intensity spectrophotometer interfaced with a computer for food quality measurements, Trans. ASAE 18:173.Google Scholar
- Norris, K. H., 1965, Measuring and using light transmittance properties of plant materials, in: “Electromagnetic Radiation in Agriculture,” Illuminating Engineering Soc. and ASAE, New York.Google Scholar
- Norris, K. H. and Hart, J. R., 1965, Direct spectrophotometric determination of moisture content of grain and seeds, in: “Humidity and Moisture,” Vol. 4, “Principles and Methods of Measuring Moisture in Liquids and Solids,” Reinhold Publishing Corp., New York.Google Scholar
- Sidwell, A. P, Birth, G. S., Ernest, J. V., and Golumbic, C, 1961, The use of light transmittance techniques to estimate the chlorophyll content and stage of maturation of Elberta peaches, Food Tech. 15:75.Google Scholar
- Yeatman, J. N., Birth, G. S., Ernest, J. V., Bender, R. W., and Sidwell, A. P., 1961, Spectrophotometric evaluation of anthocyanin pigment development and scald damage in intact red tart cherries, Food Tech. 15:521.Google Scholar
- Yeatman, J. N. and Norris, K. H., 1965, Evaluating internal quality of apples with new automatic fruit sorter, Food Tech. 19:123.Google Scholar