Possible Interaction: Nitrogen and Tannins

“First, available nitrogen, rather than total nitrogen, is nutritionally important, while the presence of tannins is the major factor reducing the availability of nitrogen in browse plant species.”

“ Tannins reduced the digestibility of nitrogen (N) in vitro, creating variation in available N concentrations among the home ranges of individual possums in an otherwise homogeneous habitat.”

“Expression of resistance largely reflected the combined and inverse effects of nitrogen and condensed tannin concentrations.”

“Fecal excretion of nitrogen was strongly increased by tannic acid , and this effect was quantitatively modified by the presence of the two other compounds, particularly by sulfite.”

“Breakdown of tannic acid could influence the marine nitrogen and carbon cycling by releasing DON and DOC, respectively, into the adjacent estuaries.”

“With the addition of 1 and 2% TA , the pH values (5.55–5.04 and 4.87, respectively) and ammonia-N (NH3-N) content (85.5–27.5 and 16.9 g/kg total nitrogen ( TN ), respectively) were all significantly decreased in stylo silage.”

“ Tannin supplements altered nitrogen excretion routes in lactating dairy cows, and BCT significantly decreased the urinary nitrogen excretion (p = 0.04).”

“Condensed tannin (CT) contents of European aspen (Populus tremula L.) vary among genotypes, and increases in nitrogen (N) availability generally reduce plants' tannin production in favor of growth, through poorly understood mechanisms.”

“ Nitrogen addition generally caused growth to increase, and tannin levels to decrease; however, individualistic responses among genotypes were found for height growth, biomass of specific tissues, root:shoot ratios, and tissue lignin and N concentrations.”

“Both nitrogen and tannin additions to the forest floor altered some interactions among species.”