アンモニウム保持を改善し窒素損失を低減する新規土壌改良材（New Soil Amendment Improves Ammonium Retention and Reduces Nitrogen Loss）

2026-01-26 中国科学院（CAS）

Placement of HAMB in the soil layers and the sampling time (Image by YANG Yang)

＜関連情報＞

• https://english.cas.cn/newsroom/research_news/chem/202602/t20260210_1150646.shtml
• https://link.springer.com/article/10.1007/s11368-025-04207-3

フミン酸改質ベントナイトによる土壌アンモニウム保持力の向上 Enhancing soil ammonium retention with humic acid-modified bentonite

Na Li,Sinan Li,Feng Li,Xiaohua Shen,Xiaoyu Ni,Ye Yang & Yang Yang
Journal of Soils and Sediments  Published:14 January 2026
DOI:https://doi.org/10.1007/s11368-025-04207-3

Abstract

Purpose

Soil ammonium (NH₄⁺) loss via leaching and ammonia (NH₃) volatilization threatens agricultural sustainability and environmental quality. This study explored the effects of humic acid-modified bentonite (HAMB) on soil NH₄⁺ retention and nitrogen loss mitigation, to support soil fertility maintenance and sustainable agricultural nitrogen management.

Methods

Three treatments [the control (CK), HAMB applied in 0 − 10 cm layer (HAMB1), and HAMB applied in 10 − 20 cm layer (HAMB2)] were set in a wheat field during 2020 − 2023. Soil samples were collected to measure NH₄⁺ adsorption and desorption, potential NH₄⁺ leaching, and potential NH₃ volatilization. Langmuir adsorption isotherm model was used to determine soil NH₄⁺ adsorption parameters (Q_max, k, and MNBC).

Results

HAMB application enhanced NH₄⁺ adsorption, suppressed NH₄⁺ desorption (effects lasting 6 − 7 months), increased Q_max, MNBC (effects lasting 5 − 6 months), and k (effects lasting 1 month), and reduced potential NH₄⁺ leaching by 5.2% − 31.0% and NH₃ volatilization by 5.7% − 58.3% (effects lasting ~ 7 months). These effects extended vertically to the subsoil layers (10 − 20 cm) below the HAMB-applied horizon. Q_max and MNBC were long-acting key parameters for nitrogen loss regulation.

Conclusions

This study highlights the effects of HAMB application on enhancing soil NH₄⁺ retention and underscores the necessity to optimize its preparation methods to further improve NH₄⁺ adsorption capacity and reduce nitrogen loss. These findings provide substantial support for soil fertility maintenance, environmental pollution mitigation, and sustainable agricultural nitrogen management.