Evaluation of Inoculation with Two Strains of Rhizobium Bacteria on some Growth and Yield Traits of Cowpea Plant in Gypsiferous Soil

Abstract

A field experiment was conducted during the spring season on 3/25/2022 in the fields of Tikrit University / College of Agriculture located in the research station of the Department of Soil Sciences and Water Resources, with the aim of studying the effect of inoculation with Rhizobia bacteria and nitrogen fertilization on the growth and yield of cowpea in gypsiferous soil. It was conducted with a completely random block design R. C. B. D With three replicates, the experiment included two main factors: inoculation with rhizobium bacteria, and the second factor was nitrogen fertilization. The inoculation factor was three levels (A0 = non inoculation, A1 = inoculation with the first strain, Bradyrhizobium manausense, and A2 = inoculation with the second strain, Bradyrhizobium vignae), and the second factor was nitrogen fertilization. With three levels N0 and N1 = 40 kg / ha and N2 = 80 kg / ha, the results showed the excelled of the inoculation treatment with root nodules Bradyrhizobium vignae on the control treatment and even the second strain Bradyrhizobium manausense in all studied traits of cowpea plant, and the percentage increase of the inoculation treatment was Bradyrhizobium vignae with 40 kg nitrogen fertilizer over the comparison treatment in the number of root nodes and their wet weight (1474.87, 267.101)%, while the dry weight of the root and vegetative total, plant length and roots, the increase was (44.347, 79.283, 12.771, 21.233)%, respectively, and the number of pods of the early yield And the total (120.925, 4.303)%, and the plant yield of straw (46.054), respectively.