Abstract
A field experiment was carried out at the experimental farm of soil laboratory belong to Directorate of Diyala Agriculture, Iraq during 2017. The experiment comprises of different doses of biofertilizers (Azotobacter chroococcum and Pseudomonas fluorescens) 0.08, 0.14 and 0.28 g/plant to assess their performance on growth characteristics of broccoli. The experiment was laid out in randomized complete block design having four treatments with three replications. The data analysis revealed that the maximum of leaves numbers in the treatment of Biofertilizer, 0.28 (23.4) whereas the maximum area of bigger leaf and head diameter was recorded in all treatments of Biofertilizer 0.08, 0.14 and 0.28 (415.9, 340.3 and 373.9 cm) and (15.5,15.4 and 15.1cm) as compared with control (108.8 cm) and (3.0 cm) respectively.
Highlights
IntroductionAzotobacter is aerobic bacteria and heterotrophic, it has the ability to fix nitrogen nonsymbiotically and existed in soils and water [5; 6; 7; 8]
Bio fertilizer (Azotobacter chroococcum & Pseudomonas fluorescens) as commercial formulation was obtained from a ministry of science and technology
DAP fertilizer (Diammonium phosphate) at the rate of 100 kg\ hectare was added at 29/9/2017 whereas bio fertilizers were added to each plant by drill the soil close the plant and deep 5 cm at 18/10/2017, the experiment included three levels of bio fertilizers 0.08, 0.14 and 0.28 g/plant with a treatment of control without adding with three replications, the distance between row to row and plant to plant was kept as 40 cm × 20 cm respectively, ten plants of each replicate were taken randomly for recording vegetative growth characteristics
Summary
Azotobacter is aerobic bacteria and heterotrophic, it has the ability to fix nitrogen nonsymbiotically and existed in soils and water [5; 6; 7; 8]. It has capability of synthesizing antibiotics, plant growth promotion substances, exopolysaccharides, vitamins and pigment production [9; 10; 11; 12; 13; 14]. This study was carried out to evaluate Azotobacter chroococcum and Pseudomonas fluorescens on the growth of broccoli
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