EFFECT OF CATTLE MANURE, ACTIVE DRY YEAST AND HUMIC SUBSTANCES ON THE GROWTH, YIELD AND CHEMICAL CONSTITUENTS OF Oenothera biennis PLANT

Abstract

This study was conducted at the experimental farm of the Medicinal and Aromatic Plants Research Department in El-Kanater El-Khaireya (Kaliobeya Governorate), Horticulture Research Institute, Agricultural Research Center, and the Ornamental Horticulture Department, Faculty of Agriculture, Cairo University, during the two successive seasons of 2012/2013 and 2013/2014. The aim of this study was to investigate the effect of NPK fertilization, in comparison to cattle manure (at rates 15 or 30 m3/fed.), humic acid (at 1 l/fed.) and yeast (at rates of 4 or 8 g/l water) on the growth, yield and chemical constituents of Evening Primrose plants (Oenothera biennis), and to reach the highest productivity of seeds and oil by applying organic fertilization. The control treatment (the recommended NP