The assay use split plot design on two factors, including the date of seeding and density, to define the better density and most suitable date of seeding on sand Jerusalem artichoke.

本试验采用播期与栽培密度两因素的裂区设计，以确定沙地菊芋种植的较佳密度和适宜播期。

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Specially formulated lubricants are used in fracking, which involves pumping water, fine sand and fracking fluids underground to split open oil- and gas-bearing rocks.

NPR: Judge Sides With Wyoming In Fracking Chemical Suit