Photosynthetic Physiology Comparisons between No Tillage and Sod Culture of Citrus Farming in Different Seasons under Various Light Intensities

Sod culture (SC) and no tillage (NT) are modern orchard management systems, two different bases for the sustainable development production of citrus orchards in Taiwan. However, there is information about efficiency either NT or SC on photosynthetic physiology farmed under seasons varying light intensities. The objective this study was to clarify impacts eco-friendly farming apparatus an important plantation species response intensities over seasons. results showed that Rd (dark respiration rate CO2), Qy (light quantum yield LCP compensation point), Amax (maximum net assimilation Fv/Fm values plants were somewhat higher same season, particularly fall winter. As intensity increased from 200 2000 ?mol photon m?2 s?1 PPFD, Pn (net photosynthesis rate), Gs (stomatal conductance), ETR (electron transport NPQ (non-photochemical quenching), (potential PSII) observed spring summer compared winter, increasing decreasing all Positive significant correlations shown between with illuminations, whereas negative relationships winter at 1200~2000 PPFD. In short, useful non-destructive estimations since these indices significantly positively correlated leaves exposed 0~1200 PPFD spring, fall, providing a quick means identify physiological condition various tillages. precise parameters such as irradiances varied also provides implications cropping systems future CO2 potentially wetter drier environments. tillages may hold promise maximizing economic growth grown field.