Interactive Effects of Inoculation with Two Isolates Providencia vermicola and Raoultella planticola and Two Levels of Mineral Fertilizers on Wheat Yield Increase

Abstract

The aim of this study was to evaluate the efficiency of bio fertilizers produced from local isolates of Providencia vermicola and Raoultella planticola in field trials conducted during 2021-2022 at the Faculty of Agriculture, Al-Muthanna University, Bandar, Iraq, Using a completely randomized design with three replicates, microbial bio fertilizers were considered as the first factor, which included the use of single and double bacterial inoculums consisting of the above bacteria, while the second factor included two levels of fertilizers (0 and 50%) fertilizer recommendation. The experiment also included the use of two comparative treatments, the first with a full recommendation (160, 100 and 100 kg H-1) of nitrogen, phosphorus and potassium, and the second a negative comparison treatment without the use of biological or chemical fertilizers. Characteristics of 1000-grain weight, grain yield, biomass and percentage of above-ground elements (N, K, P) at 50% flowering stage. The results showed the superiority of the double fertilization treatment (P.vermicola and R.planticola) in the characteristics of grain yield and the percentage of elements (nitrogen, potassium and phosphorus) over all bio fertilization treatments, as rates were recorded (7.21 μg H-1, 3.51%, 2.27%), 0.73%). The treatment with half the recommended amount of fertilizer was superior to the treatment with no added fertilizer on all the characteristics studied, as it recorded (48.5 g, 6.76 μg H-1, 20.88 μg H-1, 3.05%, 2.33%, 0.70 %), and treatment Showing an overlap between (P.vermicola and R.planticola), half of the fertilizer recommendations were significantly better than (4.24%, 2.96%, 0.81%) in terms of percentage of NPK elements.