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Prediction of the clover content of red clover‐ and white clover‐grass mixtures by near‐infrared reflectance spectroscopy
Author(s) -
Wachendorf,
Ingwersen,
F. Taube
Publication year - 1999
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1046/j.1365-2494.1999.00150.x
Subject(s) - trifolium repens , red clover , agronomy , near infrared reflectance spectroscopy , growing season , reflectivity , near infrared spectroscopy , field experiment , environmental science , biology , physics , optics , neuroscience
This study assesses near‐infrared reflectance spectroscopy (NIRS) as a rapid and reliable method for estimating the clover content of clover/grass mixtures. NIRS calibrations were derived both for red clover ( Trifolium pratense ) and white clover ( T. repens ) mixtures. To maximize variability, the set of samples for analysis was selected from field plots receiving a wide range of nitrogen fertilizer application and harvested over 2 years at weekly intervals throughout the growing season. The samples were scanned using a NIR‐Systems model 5000 monochromator. A total of 183 white clover/grass and 282 red clover/grass samples were used to calibrate and cross‐validate the equations derived. The NIRS calibrations obtained from this study have the potential to be used in research on clover/grass mixtures as well as for advisory work.