R字彙

radiocarbon dating
radioisotope tracer technique
rainfed farming
rainstorm erosion
randomized block experiment
rapid test
ratio of material flow
raw humus
readily available fertilizer
real specific gravity
recalcification
recent erosion
reclaimable land
redeposit
reference material of soil
Regosol
regulations of soil and water conservation
regur
relief
rendzina
replaceable bases
resilicification
respiratory quotient{=RQ}
retention-type terrace
reticulate mottling
reticulated mottling horizon
revegetation
reversed terrace
rheological property of soil
rhizobia
rhizobial nodule
rhizobiotoxin
rhizoplane
rigolith
ripple
river wash
rolling hill
rosette
rotation design
rotational grazing
rubble masonry dam
rubification
rupture modulus

raindrop
raindrop erosion
raindrop impact energy
raindrop kinetic energy
raindrop size
raindrop size distribution
raindrop splash
raindrop splash amount
raindrop splash angle

rainfall amount
rainfall erosion
rainfall erosivity
rainfall erosivity index
rainfall erosivity parameter
rainfall infiltration
rainfall intensity
rainfall intensity frequency curve
rainfall interception
rainfall simulation
rainfall simulator

reconnaissance soil map
reconnaissance soil survey

red desert soil
red earth
red prairie soil
red soil

reddish brown lateritic soil
reddish brown soil
reddish chestnut earth
reddish yellow podzolic soil

redox couple
redox potential

regional distribution of erosion
regional theory

regression design
regression-orthogonal design

relative age of soil
relative diffusion coefficient of soil air
relative transpiration
relative water content

relict
relict soil

reservoir
reservoir pool

residual acidity
residual clayification
residual deposit
residual shrinkage
residual soil

rhizobium
rhizobium inoculant

rhizosphere
rhizosphere effect
rhizosphere microorganism
rhizosphere nutrition

ridge
ridge tillage
ridge-type terrace

rill
rill erosion

road cut
road erosion

root exudate
root hole
root interception
root nodule
root system
root zone

runoff
runoff coefficient
runoff erosion
runoff erosivity
runoff factor
runoff gathering
runoff kinetic energy

rust spot
rust streak

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