Fragipan Horizon Changes Using Annual Ryegrass and Other Admendments  

作　　者：Lloyd Murdock Anastasios Karathanasis Dottie Call Dana L. Dinnes Amitava Chatterjee Lloyd Murdock;Anastasios Karathanasis;Dottie Call;Dana L. Dinnes;Amitava Chatterjee(Department of Plant & Soil Science, University of Kentucky, Lexington, KY, USA;USDA-ARS, National Laboratory for Agriculture and the Environment, University Bldg, Ames, IA, USA)

机构地区：[1]Department of Plant & Soil Science, University of Kentucky, Lexington, KY, USA [2]USDA-ARS, National Laboratory for Agriculture and the Environment, University Bldg, Ames, IA, USA

出　　处：《Open Journal of Soil Science》2024年第6期388-397,共10页土壤科学期刊（英文）

摘　　要：A greenhouse experiment was conducted involving intact fragipan soil cores of 50 cm thickness after removing the topsoil horizons. The cores were maintained in moist condition throughout the experiment and received several treatments with various amendments for different periods ranging from 9 to 17 months. The amendments included annual ryegrass or Festulolium residues, powder limestone and various humate compounds alone or in combination with the grass residues. The results suggested a significant effect of ryegrass and Festulolium in reducing penetration resistance into the top 10 cm of the fragipan within 9 - 17 months, particularly when used in combination with certain humate materials such as Leonardite. Apparently, this is the result of the release of certain soluble organic compounds from the plant residues or the humate amendments that increase the solubility of Si and Al associated with the fragipan brittleness, thus decreasing the density of the compacted fragipan material.A greenhouse experiment was conducted involving intact fragipan soil cores of 50 cm thickness after removing the topsoil horizons. The cores were maintained in moist condition throughout the experiment and received several treatments with various amendments for different periods ranging from 9 to 17 months. The amendments included annual ryegrass or Festulolium residues, powder limestone and various humate compounds alone or in combination with the grass residues. The results suggested a significant effect of ryegrass and Festulolium in reducing penetration resistance into the top 10 cm of the fragipan within 9 - 17 months, particularly when used in combination with certain humate materials such as Leonardite. Apparently, this is the result of the release of certain soluble organic compounds from the plant residues or the humate amendments that increase the solubility of Si and Al associated with the fragipan brittleness, thus decreasing the density of the compacted fragipan material.

关 键 词：Fragipan Fragipan Horizon Fragipan Soils Changing the Fragipan Annual Ryegrass Changes Fragipan Festulolium Changes Fragipan Amendments That Change the Fragipan 

分 类 号：TG1[金属学及工艺—金属学]