Growth Response of Newly Planted Valley Oak Trees to Supplemental Fertilizers

Abstract Growth of Valley Oak (Quercus lobata Nee) trees was not improved by slow-release or soluble fertilizers applied at planting time, nor by a single application of soluble fertilizer one year after planting. The native soil, with nutrient levels typical of newly developed residential and park areas in the region, provided adequate nutrition for good tree growth over the term of the 3-year study.