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Humus is organic matter which has decomposed to where it can contribute nutrients for plant uptake.

Individual Test Kits
Organic Matter:
Organic matter is important to soil in that it serves as a reservoir for moisture and nutrients which will eventually become available to the plant.

The pH value affects all mineral elements and the biological processes made available to plants from the soil. Accurate pH testing is essential to determine lime requirements and to insure that a mineral-rich soil is also a fertile one.

Plant tissue testing provides essential information concerning plant use of nutrients vital to their growth.

Texture
The overall texture of a soil affects growth in the root zone, which determines the above-ground growth production, and is determined by the fractions of sand, silt, and clay present.