To explore the optimal mode of water and nitrogen management and effective utilization of young arabica coffee tree, using two water levels, i.e. middle water WM, 65%~80% of soil field capacity(FC)and low water(WL, 50%~65%FC), three nitrogen levels, i.e. high nitrogen(NH, 0.4 g/kg air-dried soil), low nitrogen(NL, 0.20 g/kg air-dried soil)and no nitrogen(NZ, 0), two SAP levels, i.e. added SAP(SH, 1 kg/m3)and no SAP(SZ, 0), the effects of soil moisture, nitrogen and superabsorbent polymers(SAP)on accumulation of water and nitrogen, dry mass production and use of water as well as nitrogen in root-zone of young arabica coffee tree were studied. The results show that, compared to WL, WM can increase total dry mass, water use efficiency(WUE), total nitrogen uptake(TNU)and nitrogen dry matter production efficiency(NDMPE)by 86.0%, 36.4%, 73.1% and 5.3%, respectively. Compared to NZ, NL and NH has the same effect on WUE and TNU increment. Compared to SZ, SH can increase soil NO-3-N content, total dry mass, WUE and TNU by 21.9%~43.0%, 78.3%, 68.9% and 91.2%, respectively, while NDMPE is redued by 10.0%. Under the condition of middle water(65%~80%FC)and low nitrogen(0.2 g/kg dry soil), SAP can effectively regulate soil moisture and nitrogen environment, and can promote dry mass production and increase water and nitrogen use efficiency. Therefore, WMNLSH is the optimum combination of water and nitrogen efficient use in the experiment.
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