Earth & Environmental Sciences
soil
100%
paleosol
44%
humus
31%
plain
26%
pedogenesis
25%
soil cover
24%
Holocene
21%
Chernozem
21%
humic acid
16%
wheat
15%
trace element
15%
soil organic matter
14%
loam
13%
organic matter
13%
soil formation
13%
salinization
13%
plant species
13%
humic substance
12%
steppe
12%
saline soil
11%
Pleistocene
11%
seedling
11%
contaminated soil
10%
clay
10%
fallow
10%
rhizosphere
9%
soil profile
9%
sodic soil
9%
scandium
9%
carbonate
8%
chronosequence
8%
climate
8%
bromine
8%
indicator
8%
carbon
7%
rock
7%
Bronze Age
7%
salt
7%
soil map
7%
effect
7%
forest-steppe
7%
sediment
7%
loess
6%
acid
6%
grass
6%
Phaeozem
6%
mineral
6%
terrace
6%
permafrost
6%
nuclear magnetic resonance
6%
moraine
6%
heavy metal
6%
soil property
6%
nitrogen
6%
spectroscopy
6%
sedimentation
6%
Gleysol
6%
peat soil
6%
europium
5%
chemical element
5%
boreal forest
5%
organic carbon
5%
phytoremediation
5%
soil horizon
5%
environmental history
5%
parent material
5%
barley
5%
soil surface
5%
oxalic acid
5%
soil contamination
5%
calcium
5%
oxalate
5%
forest soil
5%
fungus
5%
Agriculture & Biology
soil
48%
humus
20%
soil organic matter
20%
soil formation
19%
humic acids
16%
Chernozems
16%
spent grains
13%
Azospirillum
9%
carbonates
8%
humic substances
8%
Russia
8%
paleosolic soil types
7%
trace elements
7%
holocene soils
7%
bromine
7%
wheat
7%
organic wastes
7%
soil map
7%
potassium bromide
7%
fallow
6%
Egypt
6%
soil profiles
6%
plant growth
6%
saline sodic soils
6%
soil properties
6%
gray forest soils
6%
Triticum aestivum
6%
polycyclic aromatic hydrocarbons
5%
soil horizons
5%
soil fertility
5%
humus horizons
5%
hydromorphic soils
5%
fertilizers
5%
nutrients
5%
arid zones
5%