2. Materials and methods
2.1. Study site
The study was conducted at Vanmeter farm of the Ohio State University South Centers at Piketon (39°02′30″N, 83°02′00″W), South-central Ohio, USA. On average, soil has pH 6.2, electrical conductivity 206.4 μS/cm, total porosity 44.6%, and contains 21, 55, and 24% sand, silt and clay, respectively at 0–30 cm depth
2. Materials and methods2.1. Study siteThe study was conducted at Vanmeter farm of the Ohio State University South Centers at Piketon (39°02′30″N, 83°02′00″W), South-central Ohio, USA. On average, soil has pH 6.2, electrical conductivity 206.4 μS/cm, total porosity 44.6%, and contains 21, 55, and 24% sand, silt and clay, respectively at 0–30 cm depth
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