Effects of various fertilizers on sediment flocculation in high-sediment water drip irrigation systems

文献类型： 外文期刊

第一作者： Li, Jingzhi

作者： Li, Jingzhi;Xiao, Yang;Shen, Yan;Zhang, Kai;Li, Yunkai;Li, Jingzhi;Xiao, Yang;Shen, Yan;Zhang, Kai;Li, Yunkai;Ma, Changjian

作者机构：

期刊名称：IRRIGATION SCIENCE （ 影响因子：3.1； 五年影响因子：3.3 ）

ISSN： 0342-7188

年卷期： 2024 年

页码：

收录情况： SCI

摘要： High-sediment water (HSW) drip irrigation has the potential to address agricultural water shortages. However, the sediment flocculation in HSW causes serious technical and economic problems (e.g., emitter clogging). Fertilizer application has been demonstrated to significantly affect sediment flocculation, but the effects of various types of fertilizers on HSW sediment flocculation remain unclear. This study systematically investigated the effects of 17 types of most commonly used fertilizers (Nitrogen, phosphorus, potassium, calcium, magnesium, iron, etc.), and 4 shear forces (0 Pa, 0.2 Pa, 0.4 Pa, and 0.6 Pa) on the flocculation of HSW sediments. The changes in HSW pH, electric conductivity, Zeta potential, oxidation reduction potential, surface tension and dissolved oxygen were measured. Results showed that 11 types of fertilizer application enhanced sediment flocculation. Potassium sulphate had the highest sediment flocculation capacity, followed by calcium ammonium nitrate, ammonium sulphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium carbonate, calcium chloride, ferrous sulphate, potassium chloride, ammonium bicarbonate, and dipotassium hydrogen phosphate. This was because these fertilizers increased the water cation concentration and decreased the surface charge of sediment particles. Furthermore, only 6 types of fertilizers (i.e., iron sulphate, magnesium chloride, manganese sulphate, ammonium chloride, copper sulphate) reduced sediment flocculation. This was because these fertilizers inhibited the connection and collision between sediment particles, thus reducing the likelihood of sediment flocculation. In addition, a higher shear force can reduce HSW sediment flocculation. However, the six water quality parameters did not have statistically significant correlations with sediment flocculation. This study is of significance for clarifying the effect of fertilizer application on sediment flocculation, with implications for the application and promotion of HSW drip fertigation technology.

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