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• W2028708340 endingPage "1936" @default.
• W2028708340 startingPage "1927" @default.
• W2028708340 abstract "ABSTRACT An efficient and accurate detection of dry matter (DM) yield of legume–grass mixtures can facilitate a targeted and site‐specific management of legume‐based swards. The major objective of this study was to examine the relationship between spectral signatures of legume–grass swards and DM yield across a wide range of legume species (white clover [ Trifolium repens L.], red clover [ T. pratense L.], alfalfa [ Medicago sativa L.], birdsfoot trefoil [ Lotus corniculatus L.]), legume proportion (0–100% of DM), and growth stage (beginning of tillering to end of flowering). Modified partial least squares (MPLS) regression, stepwise multiple linear regression (SMLR), and the vegetation indices (VIs), simple ratio, normalized difference vegetation index, enhanced vegetation index, and red edge position were used for analysis of the hyperspectral data set (350–2500 nm). Compared to common calibrations, legume‐specific models achieved better results, indicating that each legume species had its own spectral characteristics. Modified partial least squares and SMLR gave the best R 2 values, ranging in cross validation from 0.74 to 0.92 with a standard error below 92 g DM m −2 The DM yield prediction by VIs resulted in unsatisfactory accuracies. Prediction accuracy for MPLS and SMLR models were still acceptable even with a reduced spectral data set (630–1000 nm), a finding that could facilitate an application of field spectroscopy in practice." @default.
• W2028708340 created "2016-06-24" @default.
• W2028708340 creator A5013871489 @default.
• W2028708340 creator A5026275344 @default.
• W2028708340 creator A5050446343 @default.
• W2028708340 date "2009-09-01" @default.
• W2028708340 modified "2023-09-27" @default.
• W2028708340 title "Determination of Dry Matter Yield from Legume-Grass Swards by Field Spectroscopy" @default.
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• W2028708340 doi "https://doi.org/10.2135/cropsci2008.10.0608" @default.
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