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Effects of Different Irrigation Treatments on Aquaculture Purification and Soil Desalination of Paddy Fields

1
College of Agricultural Engineering, Hohai University, Nanjing 210098, China
2
Royal Irrigation Department, Bangkok 10300, Thailand
3
Department of Soil and Land Reclamation, Aleppo University, Aleppo 1319, Syria
*
Author to whom correspondence should be addressed.
Water 2019, 11(7), 1424; https://doi.org/10.3390/w11071424
Received: 15 May 2019 / Revised: 11 June 2019 / Accepted: 8 July 2019 / Published: 11 July 2019
(This article belongs to the Section Water and Wastewater Treatment)
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Abstract

Aquaculture wastewater contains considerable quantities of organic matter, nitrogen, and phosphorus. Irrigation of paddy rice with aquaculture wastewater can make full use of water and fertilizer, which has practical significance for alleviating water-use conflicts in the coastal areas of Jiangsu Province and promoting soil desalinization. Our objective in this study was to evaluate the effects of water quality indexes of surface discharge in paddy fields, total nitrogen (TN) and total phosphorus (TP) losses of discharge in paddy fields, growing indexes of plants, grain yield, as well as soil salinity affected by the different irrigation treatments. To achieve this objective, experiments were conducted from May to October in 2017. There were four treatment combinations: I1W1 (shallow–frequent irrigation and aquaculture wastewater), I2W1 (shallow–wet irrigation and aquaculture wastewater), I3W1 (flooding irrigation and aquaculture wastewater), and I1W2 (shallow–frequent irrigation and fresh water). The results revealed that there was no significant difference in grain yield among the three wastewater irrigation treatments. Meanwhile, the values of water quality indexes were optimal in I3W1; the total losses of TN and TP of the I3W1 treatment were the lowest over the three important growth stages; the desalinization rate of I3W1 was the largest due to its long hydraulic retention time and large irrigation depth. The overall results suggested that the I3W1 treatment was the optimal treatment. View Full-Text
Keywords: irrigation treatment; aquaculture purification; rice; growth; yield; soil desalination irrigation treatment; aquaculture purification; rice; growth; yield; soil desalination
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xie, Y.; Wang, Z.; Guo, X.; Lakthan, S.; Chen, S.; Xiao, Z.; Alhaj Hamoud, Y. Effects of Different Irrigation Treatments on Aquaculture Purification and Soil Desalination of Paddy Fields. Water 2019, 11, 1424.

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