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| Effects of post-irrigation aeration on pakchoi water use efficiency and nutrient uptake characteristics in three kinds of soil |
| LEI Hongjun1,2, LI Ke1,2, FENG Kai1,2, PAN Hongwei1,2, YANG Hongguang1,2 |
| 1.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China; 2. Henan Key Laboratory of Water-saving Agriculture, Zhengzhou, Henan 450046, China |
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Abstract Post-irrigation aeration can improve anoxic environment of crop root rhizosphere and increase crop yield. Hence investigating into effects of post-irrigation aeration on crop growth and nutrient absorption characteristics can provide a scientific guidance for application of aerobic irrigation technique. Three typical soils(clay soil in Zhengzhou, silty loam soil in Luoyang and sandy loam soil in Zhumadian)in Henan Province were collected and pakchoi was selected as experimental crop. Two groups, namely post-irrigation aeration(MV)and control(CK), were established in pot experiments under subsurface trickle irrigation conditions in a greenhouse, and then the crop water use efficiency and nutrient absorption characteristics were studied. Results showed that the crop root activity, root dry weight and net photosynthetic rate in MV group were significantly improved compared with those in CK group. The transpiration rate in MV group was increased by 20.61%, 15.98% and 33.33% in the clay, silty loam and sandy loam soils, respectively. The yield and water use efficiency were increased by 38.08% and 52.70%, and the absorption efficiency of nitrogen, phosphorus and potassium were increased by 61.65%, 66.54%, and 104.83% in the clay soil. In the sandy loam soil, the absorption efficiency of phosphorus and potassium were increased by 50.60% and 73.65% and the absorption efficiency of phosphorus and potassium were increased by 40.84% and 26.19%. These differences in the parameters between MV and CK groups are all of statistical significance(P<0.05). As such post-irrigation aeration can improve both water and nutrient use efficiencies and yield of pakchoi in the clay soil significantly.
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Received: 16 June 2017
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