"Living" terraces involving rows of deep rooted grasses planted on the contour would be considered as contributing to which factor in the Universal soil-loss equation?

Question

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The "living" terraces, which involve planting rows of deep-rooted grasses on the contour, contribute to the P factor in the Universal Soil Loss Equation (USLE). The P factor represents the support practice factor, which includes practices that reduce the amount of erosion under specific conditions, such as contour farming, strip cropping, terracing, and cover crops.

"Living" Terraces Involving Rows of Deep Rooted Grasses Planted on the Contour