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| HAO Kun, LIU Xiao-Gang, HAN Zhi-Hui, WU He-Lin, YU Ning, LIU Yan-Wei, YANG Qi-Liang, |
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Abstract The objective of this study was to obtain the water-saving and efficient production mode of Arabica coffee. The effects of three drip irrigation modes, conventional drip irrigation (CDI), alternate drip irrigation (ADI) and fixed drip irrigation (FDI) on growth, photosynthetic characteristics, biomass accumulation and irrigation water use efficiency of Arabica coffee were investigated under three nitrogen levels, high nitrogen (NH), middle nitrogen (NM) and low nitrogen (NL).The results showed that there was a significant Logistic curve between the plant height, the stem diameter of Arabica coffee and growth days. Compared with CDI, ADI had no significant effects on leaf net photosynthetic rate, stomatal conductance, instantaneous water use efficiency and biomass accumulation above ground of Arabica coffee, while FDI decreased significantly, ADI and FDI increased irrigation water use efficiency by 5059％ and 3285％, respectively. Compared with NH, with the reduction of N application rate, net photosynthetic rate, stomatal conductance, biomass accumulation above ground and irrigation water use efficiency decreased by 681％-1230％, 1370％-2269％, 961％-1667％ and 978％-1564％. Compared with CDINH, ADINHdecreased net photosynthesis rate and the stomatal conductance out significantly, [JP2]other treatments decreased by 916％-1922％, 1449％-3291％, [JP]and decreased biomass accumulation above ground by 826％-2734％ except ADINH, and increased irrigation water use efficiency by 1646％-6095％ except CDINMand CDINL. Therefore, alternate drip irrigation under high N level (ADINH) is the best water and nitrogen coupling mode of young Arabica coffee tree for water efficiency.
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Received: 21 March 2017
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