Impact of K-Humate and Yeast Extract Combined with Np Fertilization on Soybean Seed Yield, Quality and Protection against some Pests

Two field experiments were conducted at a special farm, in El Mansoura, Dakahlia Governorate, Egypt, during the two growing summer seasons of 2018 and 2019 to find out influence soil drench by potassium Humate (KH) yeast extract  (YE) as foliar application alone or combined (KH+YE) under different rates N P fertilization on plant growth, yield, quality protection against some pests soybean plants (Glycine max L.), c.v. Giza 111. The treatments NP arranged main plots HK YE sub-plots split-plot design with three replicates. Results indicated that drench  KH spraying had positive effect growth parameters, photosynthetic pigments, seed yield components plants. duel (KH+EY) showed significant augmentation all studied parameters compared control 50, 75 .and 100% recommended mineral does (RFD. whitefly Bemisia tabaci Genn. represented most pest attacking soybeans ratio around 56 % followed Aphis cracivora Kock  (30%), While Tetranychus urticae Koch ranged (8-10%). respectively .But mealybug Phenococcus solani Ferrisia occurrences (3-6%) seasons. In treatment spray (combined KH+YE ) decreased population B. (9.75 nymphs /10 leaves). Therefore, this investigation revealed synergistic (5 ml l-1) (4 g l-1 combination 75% is important for improving insect infestation environmental pollution caused repeated agricultural chemicals fertilizers pesticides.