Objective The effects of single amendment application and combined application of organic fertilizer with amendments on the distribution characteristics of soil aggregates and rice yield of acidic paddy soil were analyzed, in order to provide a scientific basis for the amelioration of acidic paddy soil and the improvement of rice yield. Methods Acidic paddy soil was selected as the research object. Seven treatments were set up: control (CK); calcium magnesium phosphate fertilizer (T1), calcium carbonate powder (T2), calcium magnesium silicate conditioner (T3), organic fertilizer+calcium magnesium phosphate fertilizer (T4), organic fertilizer+calcium carbonate powder (T5), and organic fertilizer+calcium magnesium silicate conditioner (T6). The soil aggregate distribution characteristics, aggregate stability, and rice yield under different treatments were compared. Results ① Overall, the soil pH value and soil nutrient indicators of T1—T6 showed an increasing trend compared with CK, but not reaching statistical significance. Among them, T5 showed the highest pH value at 4.8, an increase of 0.4 units over CK. Additionally, T1 recorded the highest available phosphorus content at 9.74 mg/kg, representing a 152% increase compared to CK. ② The content of >5 mm aggregates in air-dried soil aggregates of T1—T6 was significantly higher than in CK, with T5 treatment showing the most pronounced effect, an increase of 6.37% compared to CK. ③ The mean weight diameter (MWD), geometric mean diameter (GMD), and >0.25 mm aggregate content (R0.25) of air-dried and water-stable aggregates in T4—T6 were significantly higher than in CK, increasing by 7.51%—8.61%, 26.0%—28.6%, and 6.29%—6.50%, respectively. And the fractal dimension D significantly decreased. ④Rice yield under T1—T6 treatments was significantly higher than that of CK, with the T5 treatment showing the highest increase of 17.46%. Conclusion The combined application of organic fertilizer with calcium magnesium phosphate fertilizer, calcium carbonate powder, and calcium magnesium silicate conditioner significantly improves soil structural stability and rice yield, with the organic fertilizer+calcium carbonate powder treatment (T5) demonstrating the optimal effect.
文献参数: 王洋, 罗博, 孟佳奥, 等.有机肥配施改良剂对酸性水稻土团聚体特征及水稻产量的影响[J].水土保持通报,2025,45(5):45-52. Citation:Wang Yang, Luo Bo, Meng Jiaao, et al. Effects of combined application of organic fertilizer and amendments on aggregate characteristics and rice yield of acidic paddy soil [J]. Bulletin of Soil and Water Conservation,2025,45(5):45-52.
已有研究[6-7]表明,施用石灰、钙镁磷肥等碱性物质及有机肥是改良酸化土壤的有效手段。钙镁磷肥既能提高土壤pH值,又可提高土壤中的磷及盐基离子含量。碳酸钙能显著提高土壤pH值、土壤阳离子交换量[8]。N. S. Aye等[9]研究表明土壤中施入石灰,不仅提高土壤pH值,还能增加土壤团聚体的稳定性。有机物质富含碱性物质,不仅能中和土壤酸度、提高土壤酸碱缓冲能力,而且能络合土壤中的铝离子,其疏松多孔的特性,对改良土壤结构及团聚体的形成也起到促进作用。李越等[10]研究表明,有机肥配施化肥能显著提升土壤团聚体的稳定性。
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