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a horizon
a4/a6 ratio of humic acid
abandoned field
abrupt textural change
absorbing bond
accelerated erosion
accumulation
acetylene reduction assay
acidic fertilizer
acidification
acrisol
act of soil and water conservation
actinomycetes
activation of soil enzyme
activity of clay
actual evapotranspiration
adhesion
adsorbed ion
adsorption
adsorptive capacity
aged soil
aggregation
agric horizon
agrochemistry
agroecosystem
agroforestry
agropedology
airfilled pore
alfisol
algae
Alisol
alkalinity
alkalization
allelopathy
allophane
alluvium
aluminosilicate
aminization
ammoniacal nitrogen
ammonification
ammonifying bacteria
amorphous structure
ampholytoid
anauxite
andic soil property
andisol
ando soil
angle of repose
angular blocky structure
animal furrow
antagonism
anthropic epipedon
anthropogenic fertility
Anthrosol
anthrostagnic epipedon
antibiosis
Ao horizon
Ap horizon
apoplast transport
arbuscular mycorrhiza
Arenosol
argic horizon
argillan
argillic horizon
aridic moisture regime
aridisol
aridity
aspergillus niger method
associative nitrogen fixation
assorting effect
ATPase
Atterberg limits
autogenic soil
automorphous soil
autoradiography
autotrophic bacteria
availability
azonal soil
azotobacter

abnormal erosion
abnormal soil profile

absolute age of soil
absolute water content

absorption
absorption-type terrace

acid humification
acid humus
acid indicator plant
acid rain
acid soil
acid soluble nutrient
acid sulphate soil
acid-hydrolyzable nitrogen

acidity
acidity equivalent

activated sludge
activated sludge treatment

active acidity
active humus
active nutrient
active nutrient uptake
active water uptake

aeolian deposit
aeolian sandy soil
aeolian soil

aerobic bacteria
aerobic decomposition
aerobic enzyme
aerobic exoenzyme

aggregate
aggregate analysis
aggregate disintegration
aggregate slaking

air capacity
air dried soil
air flux
air phase volume
air porosity
air premeability

albic horizon
albic material

alkali soil
alkali-hydrolyzable nitrogen

alkaline fertilizer
alkaline indicator plant
alkaline meadow soil
alkaline soil

alluvial deposit
alluvial fan
alluvial soil

alpine frost desert soil
alpine frost soil
alpine humus soil
alpine meadow soil
alpine soil
alpine steppe soil

alternation of drying and wetting
alternation of freezing and thawing

aluminum polymerization
aluminum toxicity

amide nitrogen
amide nitrogen fertilizer

ammonia nitrogen fertilizer
ammonia toxicity
ammonia-oxidizing bacteria

ammonium and nitrate nitrogen fertilizer
ammonium fixation
ammonium nitrogen
ammonium nitrogen fertilizer

amphoteric character
amphoteric point

anaerobic bacteria
anaerobic decomposition

anion
anion adsorption
anion exchange
anion exchange capacity
anion exclusion
anion penetration
anion retention

ant channel
ant mound

apparent density
apparent mean residence time{=AMRT}
apparent specific gravity

aquic condition
aquic moisture regime

ash
ash element

available nutrient
available water

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