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Soils

Horizontales
O, A, B, and C are examples of these (8)
Another name for the A horizon (7)
Water is lost to the atmosphere as a gas (11)
Soils may develop a red colour due to the presence of these oxides (4)
Is limited in compacted or waterlogged soils (6)
May be added when plants show signs of a nutrient deficiency (10)
The breakdown of organic matter by microorganisms (13)
Sandstone is an example of this parent rock (11)
An ideal topsoil structure (5)
Sandy soils often have this structure (6)
A shallow trench used to control water run-off (5)
Slaking soils can lead to this structural problem (7)
Relating to the concentration of sodium in a soil (8)
Another term for soil aggregate (3)
The size, shape and arrangement of aggregates and the pore spaces between them (9)
A positively charged ion which may be attracted to a negatively charged clay (6)
Soil material which is not carbon based (9)
May be added to lower pH (7)
A solute which drives osmosis (4)
Verticales
Can be added to increase soil pH (4)
A soil with around equal proportions of sand, silt and clay (4)
Gypsum is added to soil to fix this problem (10)
Water in the soil which is unavailable to plants (11)
May be utilised by microorganisms during decomposition when Carbon levels are high (8)
A dark-coloured volcanic rock producing highly fertile soils (6)
Soil colloids usually have this charge (8)
High levels can lead to wilting leaves and burnt leaf tips (8)
Field test performed to determine the amount of clay in a soil (6)
A parent material found in Sydney weathering to clayey soils (5)
The process by which ammonium is converted to nitrate (13)
The attraction of water to soil solids and other surfaces (8)
Decomposed organic matter (5)
The point at which all soil pores are filled with water (10)
A charged atom (3)
Bacteria which can fix atmospheric nitrogen (9)
Compaction may be a problem in soils which have a lot of this (4)
Should be applied at a maximum of 75mm depth (5)
A pH of 7 (7)
Decomposed organic matter used as a soil conditioner (7)
The proportion of sand, silt and clay in a soil (7)