Cover crops,crop rotation,and gypsum,as conservation practices,impact Mehlich-3 extractable plant nutrients and trace metals  

作　　者：Javier M.Gonzalez Warren A.Dick Khandakar R.Islam Dexter B.Watts Norman R.Fausey Dennis C.Flanagan Marvin T.Batte Tara T.VanToai Randall C.Reeder Vinayak S.Shedekar 

机构地区：[1]National Soil Erosion Research Laboratory,USDA-ARS,West Lafayette,IN 47904,USA [2]School of Environment and Natural Resources,The Ohio State Univ,Wooster,OH 44691,USA [3]CFAES-South Centers,Soil,Water&Bioenergy Resources Program,The Ohio State Univ.,Piketon,OH 45661,USA [4]National Soil Dynamics Laboratory,USDA-ARS,Auburn,AL 36832,USA [5]Soil Drainage Research Unit,USDA-ARS,Columbus,OH 43210,USA [6]Department of Agricultural,Environmental and Development Economics,The Ohio State Univ,Columbus,OH 43210,USA [7]Department of Food,Agricultural and Biological Engineering,The Ohio State Univ.,Columbus,OH,USA

出　　处：《International Soil and Water Conservation Research》2024年第3期650-662,共13页国际水土保持研究（英文）

基　　金：support provided by United Soybean Board Project Number 1520-732-7226;by state and federal funds appropriated to The Ohio State University and The Ohio Agricultural Research and Development Center。

摘　　要：Conservation practices are encouraged to improve soil health and sustain agronomic crop production.Mehlich-3 is often used as a multi-nutrient extractant to determine soil fertility status.A study inves-tigated the impacts of the conservation practices of gypsum,cover crops,and crop rotation on 28 Mehlich-3 extractable elements,of which 11 were considered plant nutrients,from soil at three mid-western US locations.Soil was collected from 0 to 15 and 15-30 cm depths 5 years after implementing the conservation practices.Treatments consisted of(1)with and without cereal rye(Secale cereale L.)winter cover,(2)continuous soybean[Glycine max(L.)Merr.]vs.soybean-corn(Zea mays L.)rotation,and(3)annual gypsum application(0,1.1,and 2.2 Mg ha-1).Differences were observed by site,depth,and conservation practice depending on the element evaluated.Minimal interactive effects were observed among treatments.The most consistent effect was observed for crop rotation across sites.Gypsum only affected the site with the greatest clay content,where more Ca and S were retained,and Mg and Mn displaced.Cover crop only affected elements at this high clay site,where different elements were positively or negatively affected.Results suggest that not one practice fits all,and optimum conservation practices must be tailored for the site.

关 键 词：GYPSUM Cover crops Crop rotation Mehlich-3 Plant nutrients Trace metals 

分 类 号：S15[农业科学—土壤学]