T
Tannin
Natural, soluble compounds called polyphenols that are found in leaves, seed, etc. of many forage plants. Tannins condense with proteins to form a substance that is insoluble and low in digestibility. Tannins may reduce or eliminate bloat when grazing legumes.
Taproot
A prominent central root from which branch roots or lateral roots develop.
Tetraploid
A plant with four sets of chromosomes in its cells.
Tiller
In grasses, a shoot forming at the base of the plant, which has a growing point that can produce leaves, stem, head and new buds. A grass plant may have several tillers.
Toothed
Leaf margins that are serrated or notched.
Total Digestible Nutrients (TDN)
The total digestibility of the organic components in the forage.
Trifoliate
Having three leaflets, e.g. clover.
Turf
Grass with its matted roots and rhizomes that hold the soil together.