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Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (8): 53-58.doi: 10.11923/j.issn.2095-4050.cjas2024-0119

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Effects of Carbon-based Organic Fertilizer on Composition and Stability of Aggregate in Tobacco-growing Red Soil

WANG Panyu1(), WANG Yong2(), Chen Yulan3, XU Qiang1, LI Bing1, CAI Yan1   

  1. 1 College of Resources, Sichuan Agricultural University, Chengdu 611130
    2 Yuexi Branch of Liangshan Company, Sichuan Tobacco Company, Yuexi Sichuan 616650
    3 Liangshan Company, Sichuan Tobacco Company, Xichang Sichuan615000
  • Received:2024-06-14 Revised:2024-12-23 Online:2025-08-20 Published:2025-08-18

Abstract:

The aims were to study the effects of carbon-based organic fertilizer on the composition and stability of soil aggregates, and to determine the application effect of carbon-based organic fertilizer in the improvement and cultivation of red soil for tobacco growing and flue-cured tobacco production. Taking the typical tobacco-growing red soil in Panxi area of Sichuan Province as the research object, field experiments were conducted. The effects of control (CK), application of biochar (T2), application of cow manure (T3), 50% cow manure combined with 50% biochar (T4) and 70% cow manure combined with 30% biochar (T5) on soil aggregate composition and stability were determined. The results showed that with the growth period of flue-cured tobacco, the aggregate stability of red soil increased first and then decreased from <0.053 mm to 0.25-2 mm and 0.053-0.25 mm, and the 0.25-2 mm was the main concentration. In the mature stage of flue-cured tobacco, the aggregate content of 0.25-2 mm in the topsoil (0-20 cm) treated by T4 and T5 increased by 1.99-4.19 percentage points compared with T2 and T3, and the mean weight diameter (MWD) of aggregates increased by 4.41%-19.67%. Aggregate content greater than 0.25 mm (R0.25) was increased by 4.67-17.57 percentage points. Redundancy analysis showed that soil organic matter content was positively correlated with aggregates of 0.25-2 mm and 0.053-0.25 mm, which was the main factor affecting the particle size distribution and stability of aggregates in red soil. Carbon-based organic fertilizer could increase the content of organic matter in tobacco-growing red soil, promote the formation of large aggregates, and improve the stability of aggregates.

Key words: red soil, carbon-based organic fertilizer, aggregate stability, improvement of tobacco-growing soil, organic matter content