Impact of Some Organic Additives on Physical and Chemical Properties Soil and Lettuce (Lactuca sativa L.) Yield Quality

During 2019-2020 and 2020-2021 years, two-pot experiments were conducted in a clayey soil in Giza and a sandy one in Ismailia station of The Agricultural Research Center, Egypt .In these experiments, lettuce was fertilized using olive pomace ,vinasse and potassium humate (K-Humate) as partial potential substitutions for mineral fertilizers .Implications of these substitutes on growth lettuce growth parameters and its green yield as well as the physical and chemical characteristics of the soil under study .The experiments was laid out in randomized complete block design (RCBD) with nine treatments. Overall, the results of this study indicated that the application of venase 50>k-humates 50> k-humates 100 are as subsequence of these rates improved physical and chemical properties of the investigated soil. addition of 50% olive and vinasse recorded the best mean values of all tested parameters and improved growth, which reflected on yield parameter.