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| DOI：10.13522/j.cnki.ggps.2020044 |
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| Impact of Different Water-nitrogen Couplings on Yield and Water-nitrogen Productivity of Golden Pear |
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LIU Ya’nan, BAI Meijian, ZHANG Baozhong, WU Xianbing, SHI Yuan
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1. State Key Laboratory of Basin Water Cycle Simulation and Regulation,China Academy of Water Resourcesand Hydropower Research, Beijing 100038, China;2. College of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China
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| Abstract: |
| 【Background】 Pear is one of important fruits in China, making up 62% of worldwide production. However, spatiotemporally uneven precipitation and low soil fertility has limited the pear industry. Synergistic application of irrigation and fertilization at an optimal ratio can significantly increase yield, as well as water and fertilizer use efficiency of the pear, whereas in the meantime minimizing their detrimental impact on environment.【Objective】Taking golden pear as the model plant, this paper investigated experimentally the impact of different water and nitrogen couplings on yield, and water and fertilizer productivity of the pear in attempts to provide a guidance for pear production in China.【Method】The experiment was conducted in a field and compared three irrigation levels based on the field capacity θf: 75% θf (Hw), 65% of θf (Mw) and 55% of θf (Lw), and three nitrogen applications: 486 kg/hm2 (Hf), 324 kg/hm2 (Mf) and 162 kg/hm2 (Lf). Overall, there were nine treatments. Irrigation and fertigation used by local farmers was taken as the control (CK). 【Result】Irrigation and nitrogen application had a significant effect on yield, irrigation water productivity and partial productivity of the fertilizer, but the effect was not consistent. Both yield and irrigation water productivity increased monotonically with nitrogen application, but they varied concavely with irrigation amount - increasing first followed by a decline when irrigation exceeded 1 016.2 m3/hm2. Hw+Hf gave the highest yield – 31 522.5 kg/hm2, 31.92% up compared to the CK. The productivity of irrigation water peaked at 36.28 kg/m3 in Mw+Hf, while the partial fertilizer productivity maximized at 165.03 kg/kg in Hw+Lf.【Conclusion】 Design of water and fertilizer coupling in irrigation-fertigation needs to consider both yield and environment. For the golden pear studied in this paper, coupling 324 kg/hm2 of nitrogen and 1 016.2 m3/hm2 of irrigation was optimal, giving a 32 344.15 kg/hm2 yield with its associated iWUE and PFP being 31.83 kg/m3 and 99.83 kg/kg respectively. |
| Key words: drip irrigation; water and fertilizer coupling; golden pear; fruit yield; water use efficiency; partial productivity of fertilizer |
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