U字彙

U-shaped gullying
Ultisol
umbric epipedon
unconsoildated
undisturbed soil
undulating horizon boundary
unfree water
unifactor experiment
uniform terrace
unit layer
Universal Soil Loss Equation{=USLE}
upland soil
urease inhibitor
ustic moisture regime

unavailable nutrient
unavailable water

underground drainage
underground fire
underground layer

unsaturated flow
unsaturated hydraulic conductivity
unsaturated soil water flow

up and down slope
up and down slope cultivation

upper limit slope for cultivation
upper plastic limit

urban soil and water conservation
urban soil and water loss

utilization coefficient of energy
utilization rate of fertilizer

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