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A 7.5 cm layer (.1 m 3 ) of fresh or 8-year-old oak sawdust was applied to 1.7 m 2  plots as a mulch or tilled in to a depth of 10 cm. Saw dust-treated and control plots received 0.45 or 227 g of nitrogen applied as ammonium nitrate. Five one-year-old `Lynwood Gold' forsythia plants were planted in each of the 90 plots in the experiment in September 1992 and were pruned in March 1993 to 20 cm above the soil surface. Plant height, soil pH and levels of Na, organic matter, P, K Ca, Mg, NO 3  and NH 3  in the soil were determined following the 1993 growing season. Fresh and aged saw dust reduced plant growth by 40 and 31% respectively when incorporated without supplemental nitrogen. Adding the high rate of nitrogen overcame the inhibition caused by aged but not fresh sawdust. Both materials significantly reduced soil nitrate content even when used as a mulch and reduced phosphorus when incorporated. Organic matter content of sawdust-amended plots averaged over twice that of control plots. Neither material had a significant influence on pH as determined one year after incorporation.

817 PB 234 EFFECTS OF SOIL AMENDMENT AND MULCHING WITH FRESH AND AGED OAK SAWDUST ON FORSYTHIA GROWTH AND SOIL CHARACTERISTICS