Fragipan Soil Changes with Growth of Annual Ryegrass and Festulolium with Surface Applied Amendments  

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

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

出　　处：《Open Journal of Soil Science》2024年第12期765-777,共13页土壤科学期刊(英文)

摘　　要：A greenhouse experiment was conducted involving complete/intact 100 cm cores of a fragipan soil. The cores were maintained in moist conditions throughout the experiment as annual ryegrass (Lolium multiflorum) or festulolium (Lolium spp and Fescue spp hybrid) were grown with and without additional surface applied amendments, including NaF, NaNO3, NaCl, and KCl. The results suggest a significant effect of annual ryegrass and festulolium on fragipan horizon degradation after 24 months. Annual ryegrass and festulolium were found to effectively change the structure of the fragipan horizon when planted on the soil surface and roots grew through the upper soil profile and penetrated into the fragipan. The fragipan structural change (degradation) appeared to increase with each planting sequence, particularly with soybean crop rotations. Sodium nitrate added to the soil surface with the growth of annual ryegrass resulted in a significant synergistic effect for degrading the fragipan horizon. The other amendments were not as effective in causing additional fragipan degradation.A greenhouse experiment was conducted involving complete/intact 100 cm cores of a fragipan soil. The cores were maintained in moist conditions throughout the experiment as annual ryegrass (Lolium multiflorum) or festulolium (Lolium spp and Fescue spp hybrid) were grown with and without additional surface applied amendments, including NaF, NaNO3, NaCl, and KCl. The results suggest a significant effect of annual ryegrass and festulolium on fragipan horizon degradation after 24 months. Annual ryegrass and festulolium were found to effectively change the structure of the fragipan horizon when planted on the soil surface and roots grew through the upper soil profile and penetrated into the fragipan. The fragipan structural change (degradation) appeared to increase with each planting sequence, particularly with soybean crop rotations. Sodium nitrate added to the soil surface with the growth of annual ryegrass resulted in a significant synergistic effect for degrading the fragipan horizon. The other amendments were not as effective in causing additional fragipan degradation.

关 键 词：Fragipan Soil Horizons Plant Root Restriction Degradation of Compacted Sections Effect of Ryegrass and Festulolium Root Penetration Effect of NaF NaNO3 NaCl KCl Surface Applied Amendments Soybean-Ryegrass and Soybean-Festulolium Rotations 

分 类 号：S54[农业科学—作物学]