Abstract: In order to search optimal integrated management of water and fertilizer for citrus, an experiment was carried out to study the influence of different water and fertilizer coupling on photosynthetic characteristics. And ‘Shiranui’ citrus ripe for 7 years was selected as test material. There was a control treatment irrigated by conventional method (CK). And 2 irrigation levels( High Water and Low Water, irrigation amount was 80%, 60% of CK respectively), 3 fertilizer levels(High Fertilizer, Middle Fertilizer and Low Fertilizer, fertilizer amount was 85%, 70% and 55% of CK respectively) were set at heading and flowering stage (Ⅰ) and young fruit stage (Ⅱ), other stages were dealt as CK. The result showed that the net photosynthetic rate (Pn) varied as dual-peak regulation curve during the day. The transpiration rate (Tr) was increased in the morning and decreased in the afternoon. The stomatal conductance (Gs) and the intercellular CO2 concentration (Ci) presented the same diumal variation, which were decreased then lightly increased during the day for all treatment. Pn, Tr, Gs and Ci of the LW or LF were significantly lower than the CK but that of the HWHF were not significantly different from CK. Rewatering could increase photosynthetic parameters, and the gap between different treatments were narrowed compared with deficit state. The instaneous leaf water use efficiency (WUEi) was increased with more using of fertilizer and its variation causing by water was not same in different stage, but the highest instaneous leaf water use efficiency was observed in the HWHF. Pn of theⅠ-HWMF and the Ⅱ-HWHF were decreased by 7.62% and 6.08% respectively; WUEi of that were increased by 3.13% and 9.03%. Thus, the High Water and Middle Fertilizer treatment in flowering stage and young fruit stage and the High Water and High Fertilizer treatment in young fruit stage could not only keep the net photosynthetic rate but also increase the instaneous leaf water use efficiency.
Key words
citrus /
integration of water and fertilizer /
photosynthesis characteristic /
rewatering /
drip irrigation
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Funding
Supported by National Key Technologies R & D Program of China;National Natural Science Foundation of China;Fundamental Research Funds for the Central Universities
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