| dc.contributor.author |
Konstantopoulou, E |
en |
| dc.contributor.author |
Kapotis, G |
en |
| dc.contributor.author |
Salachas, G |
en |
| dc.contributor.author |
Petropoulos, SA |
en |
| dc.contributor.author |
Chatzieustratiou, E |
en |
| dc.contributor.author |
Karapanos, IC |
en |
| dc.contributor.author |
Passam, HC |
en |
| dc.date.accessioned |
2014-06-06T06:52:13Z |
|
| dc.date.available |
2014-06-06T06:52:13Z |
|
| dc.date.issued |
2012 |
en |
| dc.identifier.issn |
01904167 |
en |
| dc.identifier.uri |
http://dx.doi.org/10.1080/01904167.2012.676135 |
en |
| dc.identifier.uri |
http://62.217.125.90/xmlui/handle/123456789/5911 |
|
| dc.subject |
chlorophyll |
en |
| dc.subject |
hydroponics |
en |
| dc.subject |
Lactuca sativa L. |
en |
| dc.subject |
photosynthesis |
en |
| dc.subject |
stomatal conductance |
en |
| dc.subject |
transpiration |
en |
| dc.subject.other |
Lactuca |
en |
| dc.subject.other |
Lactuca sativa |
en |
| dc.title |
Effect of nitrogen application on growth parameters, yield and leaf nitrate content of greenhouse lettuce cultivated during three seasons |
en |
| heal.type |
journalArticle |
en |
| heal.identifier.primary |
10.1080/01904167.2012.676135 |
en |
| heal.publicationDate |
2012 |
en |
| heal.abstract |
Lettuce (Lactuca sativa L., cv. 'Parris Island') was grown hydroponically in autumn, winter and spring under five levels of nitrogen (N) fertilization. Plant biomass was highest in spring and lowest in autumn at N rates of 200 and 260 mg L-1, respectively. Increasing N application correlated positively with rates of photosynthesis, transpiration, stomatal carbon dioxide (CO2) conductance and leaf chlorophyll concentration. Photosynthetic rate, stomatal CO2 conductance, and chlorophyll a/b ratio were higher in spring than in autumn or winter. Nitrate concentrations within the leaves increased with increasing N application in all seasons. It is concluded that lettuce growth and yield is higher in spring than in winter or autumn due to enhanced photosynthesis thanks to increasingly favorable photoperiod. Regardless of season, high N rates promote yield but increase leaf nitrate concentrations. Therefore, for the production of healthy produce the recommended N rate should be based not just on yield but also on the nitrate content. © 2012 Copyright Taylor and Francis Group, LLC. |
en |
| heal.journalName |
Journal of Plant Nutrition |
en |
| dc.identifier.issue |
8 |
en |
| dc.identifier.volume |
35 |
en |
| dc.identifier.doi |
10.1080/01904167.2012.676135 |
en |
| dc.identifier.spage |
1246 |
en |
| dc.identifier.epage |
1254 |
en |