dc.contributor.author | Hughes, M.P. | |
dc.contributor.author | Lallo, C.H.O. | |
dc.contributor.author | Mlambo, V. | |
dc.contributor.author | Jennings, P.G.A. | |
dc.date.accessioned | 2017-05-16T06:32:28Z | |
dc.date.available | 2017-05-16T06:32:28Z | |
dc.date.issued | 2016 | |
dc.identifier.citation | Hughes, M. et al. 2016. Calibration and validation of optical chlorophyll-measuring devices for use in predicting crude protein concentration in tropical grass herbage. Grass and Forage Science, 72:118-136. [http://onlinelibrary.wiley.com/doi/10.1111/gfs.12219/full] | |
dc.identifier.issn | 0142-5242 | |
dc.identifier.issn | 1365-2494 (Online) | |
dc.identifier.uri | http://onlinelibrary.wiley.com/doi/10.1111/gfs.12219/full | |
dc.identifier.uri | http://hdl.handle.net/10394/24274 | |
dc.description.abstract | The objective of this experiment was to evaluate the Fieldscout CM 1000 NDVI and Yara N-Tester as easy-to-use and cost-effective tools for predicting foliar chlorophylls (a, b and total) and crude protein (CP) concentrations in herbage from three tropical grass species. Optical chlorophyll measurements were taken at three stages (4, 8 and 12 weeks) of regrowth maturity in Guinea grass (Panicum maximum) and Mulato II (Brachiaria hybrid) and at 6 and 12 weeks maturity in Paspalum spp (Paspalum atratum). Grass samples were harvested subsequent to optical measurements for laboratory analysis to determine CP and solvent-extractable chlorophylls (a, b and total) concentrations. Optical chlorophyll measurements and CP concentrations were highly correlated (Yara N-Tester: r2 = 0·77–0·89; Fieldscout CM 1000 NDVI: r2 = 0·52–0·84). Crude protein prediction models from the Yara N-Tester and Fieldscout CM 1000 NDVI accounted for 70–89% and 44–73% CP variability, respectively, in Mulato II and Guinea grass. The Yara N-tester produced more accurate and reliable CP estimates based on very high concordance correlation coefficient [CCC (0·73–0·91)] and low rMSPE, mean and regression bias. It is concluded that the Yara N-Tester produces more accurate and reliable CP estimates of tropical pastures. | |
dc.language.iso | en | |
dc.publisher | Wiley | |
dc.subject | Optical chlorophyll measurements | |
dc.subject | tropical grass | |
dc.subject | crude protein concentration | |
dc.subject | solvent-extractable chlorophyll | |
dc.title | Calibration and validation of optical chlorophyll-measuring devices for use in predicting crude protein concentration in tropical grass herbage | |
dc.type | Article | |
dc.contributor.researchID | 24830976 - Mlambo, Victor | |