English Dictionary

ulmin

noun

(organic chemistry) A brown amorphous substance found in decaying vegetation.

The ulmin in the tree bark provides protection against pests.

意味（1）

(organic chemistry) A brown amorphous substance found in decaying vegetation.

The biological features of perennial grasses involve the decomposition of their residues during the period of domination of anaerobic processes, capable of producing active humus (ulminic acid and ulmin).