The constitutive equations of the soil-root composite, which express the stress-strain relationship, were derived under the hypothesis of isotropy.

在弹性、横观各向同性条件下，计算得出了表征土壤-根系复合体应力-应变关系的本构方程。

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Root vegetables are planted in a pot whose "soil" is made of malt and hazelnut flour.

根类蔬菜被种植到一个花盆中，“土壤”是用麦芽和榛子粉做成的。

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The mineral elements from the soil that are usable by the plant must be dissolved in the soil solution before they can be taken into the root.

土壤中对植物有用的矿物质元素必须先溶解在土壤溶液中，然后才能被根吸收。

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They say the roots develop better. But Jeffrey Dinslage, president of Nature Hills Nursery in Omaha,Nebraska, points out that bare-root roses come without soil.

VOA: special.2010.06.15

Bare-root plants have no soil on their roots.

VOA: special.2009.03.03

The region's hard-packed clay soil welcomes a unique mix of plants with deep-penetrating root systems.

WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping

These included soil microbes, which govern the nutrient cycling reactions in soils, and mycorrhizae, root-colonising fungi which help plants to absorb nutrients.

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Not only do their root systems help stabilize soil and inhibit weeds, but they also offer movement, texture and year-round interest even when the blooms have long disappeared.

WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping