Above-ground biomass and nutrient distribution of released and fertilized yellow-poplar trees

A study was established to evaluate the effects of release and fertilizer treatments on above-ground biomass and nutrient distribution of 10-year old yellow-poplar ( Liriodendron tulipifera L.) saplings in Virginia. Treatments were applied in the spring of 1989 and again in 1992. Growth was evaluated over seven growing seasons, 1989 to 1995. About 71% of the biomass of 15-year old trees was bole wood, and 11% bark. Foliar biomass was 5.7% of the total. The nutrient distribution differed somewhat by treatment, with significant responses to both release and fertilization. Overall, foliage had the highest nutrient content, containing 39% of total tree N. Bole wood, due to its larger mass, contained from 42 to 55% of above-ground nutrients. Release resulted in a significant ( P