Impact of Organic Fertilizer and Silica with Potassium Humate Acid on Growth and Yield of Two Lettuce Varieties

Abstract

A field study was carried out during the 2021 Agriculture season in the vegetative field of the Department of Horticulture, University of Kerbala (Al-Hussainiya) to field out the effect of adding poultry manure and humic acid on the growth and yield of two varieties of lettuce, the study included two factors, the first factor being the varieties (local variety and Lceberg Crisphead Lettuce), and the poultry litter and Silica with potassium humate acid were used as the second factor, in order to know the effect and effectiveness of natural and manufactured organic fertilizers on the growth and yield characteristics of two varieties of lettuce, as a result of the decrease in studies on environmentally friendly soil fertilizers, the experiment was conducted based on Spilt - Plot system within the R.C.B.D. design, The results showed that the local variety recorded the rise in most of the study parameters, While the Lceberg Crisphead Lettuce variety achieved an rise in the content of proline in the leaves and dry matter in the vegetable total, the fertilizer combinations caused significant differences compared to the control treatments, treatments F8:( poultry litter 20 tons.h-1 + Silica with potassium humate 0.4 g + 10 g of peatmoos plant-1 ) achieved the best rates in most of the studied traits, while control treatment (0g) the rise values were recorded in percentage of dry matter in the total vegetables.