Publication
An in situ incubation technique to measure the contribution of organic nitrogen to potatoes
dc.contributor.author | Rodrigues, M.A. | |
dc.date.accessioned | 2010-03-08T10:51:57Z | |
dc.date.available | 2010-03-08T10:51:57Z | |
dc.date.issued | 2004 | |
dc.description.abstract | The quantification of sidedress N rate from in-season information on crop N nutritional status is extremely important in order to use only the necessary amount of nutrient to achieve maximum yields without significant N losses from soil. During three consecutive years (1996, 1997 and 1998) field N fertilizer experiments with irrigated potato (Solanum tuberosum L., cv. Désirée) were conducted in Bragança (NE Portugal). Eight preplant treatments (0, 50, 100, 200 and 300 kg urea-N/ha and poultry manure, farmyard manure and municipal solid waste in rates equivalent to 100 kg organic-N/ha) were arranged as main plots and five sidedress N rates (0, 25, 50, 100 and 200 kg urea-N/ha) included as subplots. Petiole nitrate concentration, determined by a laboratory method (PNLab, g NO3-N kg−1, dry weight basis) and by the portable RQflex reflectometer (PNRQflex, mg NO3 kg−1, from fresh tissues), and leaf N content (LeafN, g kg−1, dry weight basis) were used as N nutritional indices. From the five sidedress N rates applied over each of the preplant treatments, critical sidedress N rates were estimated for several different crop N nutritional status. This was achieved by establishing exponential asymptotic curves between sidedress N rates and tuber yields and solving the equations for 95% of maximum tuber yield. In a second step, multiple regression equations were established between the estimated critical sidedress N rates (SNrate, kg N/ha), as dependent variable, and each crop N nutritional indices (PNLab, PNRQflex or LeafN) and days after emergence (DAE). The equations obtained are: SNrate = 182.7 − 4.146 × PNLab −1.87 × DAE SNrate = 161.0 − 0.013 × PNRQflex −1.34 × DAE SNrate = 562.2 − 8.416 × LeafN −3.59 × DAE These equations provide quantitative sidedress N rates for any level of crop N nutritional indices and sampling dates from 10 to 48 days after emergence. | pt |
dc.identifier.citation | Agronomie. Agriculture & Environment,ISSN 24: 249-256 | pt |
dc.identifier.doi | 10.1051/agro:2004022 | |
dc.identifier.issn | 1161-0301 | |
dc.identifier.uri | http://hdl.handle.net/10198/2202 | |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.subject | Solanum tuberosum | pt |
dc.subject | Crop N management | pt |
dc.subject | Decision support system | pt |
dc.subject | Plant analysis | pt |
dc.subject | Tissue testing | pt |
dc.title | An in situ incubation technique to measure the contribution of organic nitrogen to potatoes | pt |
dc.type | journal article | |
dspace.entity.type | Publication | |
oaire.citation.endPage | 88 | pt |
oaire.citation.issue | 23(1) | pt |
oaire.citation.startPage | 79 | pt |
oaire.citation.title | European Journal of Agronomy | pt |
person.familyName | Rodrigues | |
person.givenName | Manuel | |
person.identifier.ciencia-id | 371D-DF0D-8D68 | |
person.identifier.orcid | 0000-0002-5367-1129 | |
person.identifier.rid | O-1721-2016 | |
person.identifier.scopus-author-id | 35270106800 | |
rcaap.rights | openAccess | pt |
rcaap.type | article | pt |
relation.isAuthorOfPublication | 43621353-fa11-4559-9b24-27eba5ad3de0 | |
relation.isAuthorOfPublication.latestForDiscovery | 43621353-fa11-4559-9b24-27eba5ad3de0 |
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