• The variations of soil depth after tillage with its depth before tillage and slope gradient can be described with a binary quadratic paraboloid regression equation.

    耕作原耕层土壤距地表深度耕作前距地表深度坡度变化可用二元二次抛物面相关方程描述

    dict.cnki.net

  • The variations of soil depth after tillage with its depth before tillage and slope gradient can be described with a binary quadratic paraboloid regression equation.

    耕作原耕层土壤距地表深度耕作前距地表深度坡度变化可用二元二次抛物面相关方程描述

    dict.cnki.net

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