Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 12, Issue 12, Pages 2164-2171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(13)60346-9
Keywords
Avena nuda; nitrogen fertilizer; nitrogen application; chlorophyll fluorescence; gas exchange
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Funding
- Special Fund for Agro-Scientific Research in the Public Interest, China [nyhyzx07-009-2]
- Earmarked Fund for China Agriculture Research System [CARS-08-B-1]
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Naked oat (Avena nuda L.) was originated from China, where soil nitrogen (N) is low availability. The responses of chlorophyll (Chi.) fluorescence parameters and leaf gas exchange to N application were analysed in this study. After the N application rate ranged from 60 to 120 kg ha(-1), variable fluorescence (F-v), the maximal fluorescence (F-m), the maximal photochemical efficiency (F-v/F-m), quantum yield (Phi(PS II)) of the photosynthetic system II (PS II), electron transport rate (ETR), and photochemical quenching coefficient (qP) increased with N application level, however, non-photochemical quenching coefficient (qN) decreased. Moreover, there was no difference in initial fluorescence (F-o) with further more N enhancement. The maximum net photosynthetic rate (P-max), apparent dark respiration rate (R-d) and light saturation point (LSP) were improved with 40-56 kg N ha(-1) as basal fertilizer and 24-40 kg N ha(-1) as top dressing fertilizer applied at jointing stage. Initial quantum yield (a) was decreased with 24 kg N ha(-1) as basal fertilizer and 56 kg N ha(-1) as top dressing fertilizer. Flag-leaf net photosynthetic rate (P-n) was significantly enhanced at the jointing and heading stages with 40-56 kg N ha(-1) as basal fertilizer; in addition, increased at grain filling stage of naked oat with 40-56 kg N ha(-1) as top dressing fertilizer. 90 kg N ha(-1) (50-70% as basal fertilizer and 30-50% as top dressing fertilizer) application is recommended to alleviate photodamage of photosystem and improve the photosynthetic rate in naked oat.
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