Publication
Use of chlorophyll-SPAD meter on potato and sorghum
| dc.contributor.author | Rodrigues, M.A. | |
| dc.contributor.author | Martins, Anabela | |
| dc.contributor.author | Ferraz, Hélder | |
| dc.date.accessioned | 2011-01-28T12:10:13Z | |
| dc.date.available | 2011-01-28T12:10:13Z | |
| dc.date.issued | 2002 | |
| dc.description.abstract | The SPAD-502 chlorophyll meter measures the transmittance of leaves at 430 nm~ which is a peak of maximum absorbance by chl, providing an indication of its chl content. Chlorophyll content of leaves or SPAD readings can be used as a nitrogen nutrition index of plants since most leafN is contained in chl molecules. In order to avoid the interference of factors besides N fertility on the interpretation of results, Peterson et al. (1993) suggest the use a N sufficiency index calculated as follows: Sufficiency index = (Average bullk readings)/(,4verage reference strip readings) x 100 %. The reference strips must be well supplied with N. A sufficiency index lower than 95 % indicates a shortage of N. In this work we study the relation between SPAD readings and laboratory measurements of chl pigments on potato and sorghum as a function of N applied. We inquire into some aspects of the use of the N sufficiency index related to the reference strips. | por |
| dc.identifier.citation | Rodrigues, Manuel; Martins, Anabela; Ferraz, Hélder (2002). Use of chlorophyll-SPAD meter on potato and sorghum. In Proc. of 7th ESA-Congress. Córdoba | por |
| dc.identifier.uri | http://hdl.handle.net/10198/3199 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | European Society for Agronomy | por |
| dc.title | Use of chlorophyll-SPAD meter on potato and sorghum | por |
| dc.type | conference paper | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Córdoba, Spain | por |
| oaire.citation.endPage | 706 | por |
| oaire.citation.startPage | 705 | por |
| oaire.citation.title | Proc. of 7th ESA-Congress | por |
| person.familyName | Rodrigues | |
| person.familyName | Martins | |
| person.givenName | Manuel Ângelo | |
| person.givenName | Anabela | |
| person.identifier.ciencia-id | 371D-DF0D-8D68 | |
| person.identifier.ciencia-id | 7B18-A810-6B93 | |
| person.identifier.orcid | 0000-0002-5367-1129 | |
| person.identifier.orcid | 0000-0001-6218-4413 | |
| person.identifier.rid | O-1721-2016 | |
| person.identifier.rid | G-5488-2013 | |
| person.identifier.scopus-author-id | 35270106800 | |
| person.identifier.scopus-author-id | 7203013518 | |
| rcaap.rights | openAccess | por |
| rcaap.type | conferenceObject | por |
| relation.isAuthorOfPublication | 43621353-fa11-4559-9b24-27eba5ad3de0 | |
| relation.isAuthorOfPublication | 383370dd-10e5-40e6-9a15-f2201fe95581 | |
| relation.isAuthorOfPublication.latestForDiscovery | 43621353-fa11-4559-9b24-27eba5ad3de0 |