Final Exam

Expressed in milliequivalents per 100 g of soil

Any element that is positively charged such as Ca2+ is called a

The ability of soil particles to absorb or adsorb and store anions

Any element that is negatively charged such as Cl is called an

Net result of the overall negative charge of the oxygen atom and the overal postive charges of the two hydrogen atoms

Clays with 11 fixed lance type (less expanding) belong to what clay group?

This refers to the process by which soil nutrients tnents such as NO2 are washed down by water from the root zone of the plants

The kind of acidity which is due to the hydrogen ion concentration of the soil solution

The practice of covering the soil surface with matenals that can maintain an ideal soil temperature

The most common smectite which is among the “swelling clays”

A state of subdivision of a particle in the soil such that surface properties predominate

A type of silicate clays with two sheets held together by oxygen atom that are mutualy shared by Si and Al

Saline soil characterized by white crust on surface and predominantly containing CaCO, is also called

Materials containing Ca or Ca and Mg compounds used mainly to neutralize soil acidity up to a desired level

Unsegmented worms in soil mostly macroscopic

Sificate, oxide and amorphous clays belong to this type of colloids

The process of substitution of one ion for another of similar size within crystal lattice

These root swelling forms due to the infection of root hairs by the Rhizobium bactena

This bacteral species oxidizes S to form SO2

Nitrosomona Nitrosococcus. Nitrobacter and Nitrococcus belong to what group of N-Fixing Bacteria bacteria (with regards to the N cycle?

Indigenous bactena are called

The process whereby cations adsorbed on the colloid are exchanged for those in the soil solution

The is ability to provide essential plant nutrients in adequate amounts and proper proportions to sustain plant growth

Invader bacteria are called