Impacts of oxygenated irrigation on potted winter wheat growth and soil aeration
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DOI:10.7606/j.issn.1000-7601.2019.04.03
Key Words: oxygation  soil aeration  winter wheat  root growth  photosynthesis  yield
Author NameAffiliation
XU Jian-xin School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
ZANG Ming School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
LEI Hong-jun School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
PAN Hong-wei School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
LIU Huan School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
CHU Meng-yuan School of Water Conservacy, North China University of Water Conservancy and Electric Power, Collaborative Innovation Center of Water Resources, Efficient Utilization and Protection Engineering in Henan province, Zhengzhou 450046, China 
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Abstract:
      Perched water often leads to decrease in soil aeration of crop roots in subsurface drip irrigated soils. Oxygation provides a source of oxygen in root environment that suffers from temporal hypoxia and unlocks yield potentials of crops. However, the effect of oxygation on soil aeration was not well known. With winter wheat as a test crop, four irrigation treatments were used including venturi cyclic aeration irrigation (VAI), hydrogen peroxides 3000 (HP3K) solution, hydrogen peroxides 0030 solution (HP30), and a control treatment (CK). Subsurface drip irrigation was implemented, and the soil aeration, crop root growth, physiological indexes, and yield were systematically monitored. The effect of oxygation on potted winter wheat growth and soil aeration was studied. Compared with the control treatment, the soil respiration in VAI increased by 106.62%, the oxygen diffusion rate in VAI and HP30 increased by 43.99% and 21.37%, respectively. Meanwhile, the total surface areas and root length density in VAI increased by 21.13% and 32.69%, and root length density and root volume in HP30 increased by 21.13% and 32.69%, respectively, compared with that of CK. The photosynthetic rate, stomatal conductance, and transpiration rate were enhanced by oxygation. Compared with CK, the photosynthetic rates in VAI, HP3K, and HP30 increased by 43.41%, 26.37%, and 20.37%, respectively; the stomatal conductance in VAI and HP30increased by 38.78% and 17.65%, the transpiration rate in VAI and HP30 increased by 21.55% and 15.83%, respectively. The yield in VAI and HP30 significantly increased by 36.27% and 23.37%, respectively, over that in CK, while the WUE in VAI significantly increased by 38.98%. In conclusion, subsurface aerated drip irrigation with aerated water improved the hypoxic environment in rhizosphere, thus enhanced the soil aeration and crop growth with increased crop yield as well as water utilization efficiency. Among the three aerated treatments, the enhancement effect in VAI was the best among the treatments.
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