Abstract
Bubbled-root irrigation could transport water and fertilizer to roots of fruit trees effectively. In order to study the characteristics of water and nitrogen transportation in the wetting body, a field experiment was conducted in Yulin city, Shanxi. During the experiment, the total amount of 30 L irrigation with 7 L/h emitter flow rate was applied by a Markov bottle. The 3 fertilizer rates were 33.3, 41.7, and 50.0 g/L. The irrigation without fertilizer was as control. The results showed that infiltration capacity of bubbled-root irrigation increased with the fertilizer rate application increase. The horizontal and vertical wetting velocities of the vertical section increased with the fertilizer rate increase, and emerged a good power function relation with time. The wetting depth of wetting body in bubbled-root irrigation increased with the fertilizer concentration increase. The average moisture content distribution for all irrigation and fertilizer application treatments was similar, and the water content increased with the fertilizer concentration increase. The NO3−–N and NH4+–N concentration at the same infiltration depth increased with the fertilizer solution concentration increase. After the water redistribution, the NO3−–N and NH4+–N concentration at the 70-cm soil depth was close to that at the background. The effects of different nitrogen concentrations on conversion rate of soil were different, the conversion rate of nitrate was not significant, and the 33.3 g/L had the highest conversion rate of NH4+–N.
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This research is supported by the National Natural Science Foundation of China (51279157, 51479161, 51479161, 51779093, 51779205).
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Responsible editor: Keda Cai
This article is part of the Topical Collection on Geodesy and Geodynamics of China
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Fu, Y., Cao, Y., Wang, H. et al. The effects of different fertilizer rates on water and nitrogen transport characteristics in the wetted body of bubbled-root irrigation. Arab J Geosci 14, 1876 (2021). https://doi.org/10.1007/s12517-021-07881-y
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DOI: https://doi.org/10.1007/s12517-021-07881-y