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Effects of water and fertilizer coupling on photosynthetic and chlorophyll contents of jujube under drip irrigation in south Xinjiang sandy area |
HOU Yusheng1,2, WANG Zhenhua1,2*, LI Wenhao1,2, BIAN Qingyong1,2, LI Chaoyang1,2 |
1.College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2.Key Laboratory of Modern Water-saving Irrigation, Xinjiang Production and Construction Group, Shihezi, Xinjiang 832000, China |
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Abstract In order to explore effects of water and fertilizer coupling on photosynthetic characteristics and chlorophyll relative contents of jujube in southern Xinjiang sandy area, the 8-year mature magnificent jujube trees were used as test plant, and water and nitrogen two-factor, three-level Latin square experiments were conducted in a small-sized land under drip-irrigation conditions. The results show that the diurnal variation of net photosynthetic rate(Pn)and stomatal conductance(Gs)of jujube presents two peaks, but the diurnal variation of transpiration rate(Tr)has a single peak. For case W2F1, the variation profiles of intercellular CO2 concentration(Ci)and leaf water use efficiency(WUE)present a single peak as well, and the maximums of Pn, Tr and Gs increase by 34.8%, 10.74% and 7.14%, respectively, compared with those under ordinary flooding irrigation(CK). For case W2F3, the peak values of Ci and WUE increase by 29.04% and 8.33%, respectively, compared with CK. Note that both chlorophyll relative content and nitrogen content are in the maximum in W3F3 treatment, especially 6.00% and 9.49% higher than in CK, respectively. Unfortunately, W3F3 shows no significant difference from W2F1(P>0.05). Pn is closely related to Tr and Gs, but Pn is just slightly related to chlorophyll relative content and nitrogen content. There is a close correlation between chlorophyll relative content and nitrogen content but a low correlation with WUE. According to the experimental results, a preliminary conclusion can be reached that irrigation 820 mm and fertilizer 450 kg/hm2(W2F1)are the best water-fertilizer supply mode for water and fertilizer saving in southern Xinjiang sandy area.
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Received: 30 March 2018
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