Effects of macromolecular organic acids on reducing inorganic phosphorus fixation in soil
Yuwen Shen,
Zheng Ma,
Haining Chen,
Haitao Lin,
Guodong Li,
Mingli Li,
Deshui Tan,
Wensheng Gao,
Shuying Jiao,
Ping Liu,
Xiaozong Song,
Shourui Chang
Affiliations
Yuwen Shen
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China; Corresponding author.
Zheng Ma
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China; Corresponding author.
Haining Chen
Yantai Academy of Agricultural Sciences, Yantai, 265500, Shandong, China
Haitao Lin
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China
Guodong Li
Fruit and Tea Technique Extension Station, Shandong Agriculture Department, Jinan, 250013, China
Mingli Li
Fruit and Tea Technique Extension Station, Shandong Agriculture Department, Jinan, 250013, China
Deshui Tan
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China
Wensheng Gao
Fruit and Tea Technique Extension Station, Shandong Agriculture Department, Jinan, 250013, China
Shuying Jiao
College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China
Ping Liu
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China
Xiaozong Song
Shandong Academy of Agricultural Sciences, Institute of Agricultural Resources and Environment; Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture; Shandong Provincial Engineering Research Center of Environmental Protection Fertilizers, Jinan, 250100, China
Shourui Chang
Agricultural Technology Extension Center of Feixian Agricultural and Rural Bureau, Linyi, Taian, 273400, China
To improve the availability of inorganic phosphorus (P) in soil, we investigated the role of three macromolecular organic acids (MOAs), including fulvic acid (FA), polyaspartic acid (PA), and tannic acid (TA), in reducing the fixation of inorganic P fertilizer in the soil. AlPO4, FePO4, and Ca8H2(PO4)6·5H2O crystals were chosen as insoluble phosphate representatives in the soil to simulate the solubilization process of inorganic P by MOAs. The microstructural and physicochemical properties of AlPO4, FePO4, and Ca8H2(PO4)6·5H2O were determined by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) before and after treatment of MOAs. In addition, the amounts of leached P and fixed inorganic P in Inceptisols and Alfisols affected by MOAs combined with superphosphate (SP) fertilizer were determined by soil leaching experiments. The presence of the three MOAs significantly increased the concentration of leached P and reduced the contents of insoluble inorganic phosphate formed with iron, aluminum, and calcium fixed in the soil, in which PA combined with SP had the most significant effect. Furthermore, the less inorganic P fixation in the combination treatment of MOAs and SP resulted in a greater wheat yield and P uptake. Therefore, MOAs could be a synergistic material for increasing P fertilizer utilization.
