Nitrogen fertilization and daminozide effects on growth,yield, and quality of concord grapes

Abstract

Yield and productivity of Concord grapes trained to the Geneva Double Curtain system were examined over a period of three seasons (1986–1988). Factorial rates of N fertilization and the growth regulator, daminozide, were applied. Results showed that daminozide at 750 ppm combined with any N fertilization level in the study increased yield without sacrificing fruit quality or vine growth. Soil N fertilization at the rates applied did not significantly affect growth, yield or quality even though higher N rates increased leaf petiole N contents. During the three year study, no interaction was found between nitrogen and daminozide on yield.

Received for publication 6/15/91. Salaries and research support provided in part by state and federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 116–90.