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Title

Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions

AuthorsIsla Climente, Ramón ; Guillén, Mónica ; Salmerón Cortasa, Montserrat
Keywordsphotosynthesis
dark respiration
nitrogen deficiency
stomatal conductance
Issue DateDec-2016
PublisherInstituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España)
CitationIsla R, Guillén M, Salmerón M. Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions. Spanish Journal of Agricultural Research 14 (4): e0806 (2016)
AbstractThere are limited studies about the effect of nitrogen (N) deficiency on leaf growth, N status, and photosynthetic capacity of maize grown under field conditions in a Mediterranean climate. The objective of this work was to evaluate the effect of different levels of mineral N availability on leaf gas exchange parameters of sprinkler irrigated maize. The experiment was conducted in a conventional maize field located in the central part of the Ebro valley (Spain) during two seasons. Using a portable LICOR-6400 equipment, instantaneous measurements and light response curves to gas exchange were conducted in plots with different levels of N supply ranging from deficient (no fertilized) to over-fertilized (300 kg N/ha). In addition to gas exchange measurements, mineral soil N content, chlorophyll meter readings (CMR), leaf N content, and grain yield were measured in the different plots. Results showed that grain yield reached a plateau (14.5 Mg/ha) when the mineral N available was about 179 kg/ha. CMR were linearly and highly related to total N in ear leaves. The relationship between light-saturated leaf photosynthesis measurements and CMR was significant but very weak (R2 =0.13) at V8 and V14 stages but increased later in the growing season (R2 =0.52). Plants with intermediate levels of N supply (48<CMR<54) tended to have slightly higher assimilation rates than plants with higher CMR readings. As the available N increased, the saturation point, the light compensation point and significant increases of dark respiration rate were observed. Under the conditions of the study, leaf N contents of 1.9% in the ear leaf were enough to maximize leaf assimilation rates with no need to over-fertilize the maize crop.
Description9 Pags.- 1 Tabl.- 5 Figs. This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial (by-nc) Spain 3.0 Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Publisher version (URL)http://dx.doi.org/10.5424/sjar/2016144-9109
URIhttp://hdl.handle.net/10261/142275
DOI10.5424/sjar/2016144-9109
E-ISSN2171-9292
Appears in Collections:(EEAD) Artículos
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