Effect of phosphorus solubilizing bacteria on some soil properties, wheat yield and nutrient contents

Abstract

Application of chemical fertilizers besides economic concerns has been a reason of environmental and ecosystem degradation, so sustainable organic agriculture is becoming popular in researches and among farming communities. Phosphorus holds second position after nitrogen among macronutrients required for better plant growth and is needed in higher amounts. Meeting this high phosphorus input for better crop yields causes environmental problems like eutrophication, so phosphorus solubilizing bacteria (PSB) and plant growth promoting rhizobacteria (PGPR) are being emphasized to utilize phosphorus fixed in soil layers. This study was carried out to evaluate the effect of PSB on plant growth, soil biological properties including enzymes and soil respiration. Treatments including control, 50 mg kg -1 nitrogen, 50 mg kg -1 nitrogen and 12 mg kg -1 phosphorus applications reduced dosage of nitrogen 25 mg kg -1 with PGPR and 25 mg kg -1 nitrogen along with 0.12 g raw phosphate and PGPR. Results indicated that plant parameters like above and below ground plant biomasses (fresh and dry weight), plant nitrogen and phosphorus content were significantly enhanced in all the treatments when compared with the control. While soil pH in rhizosphere significantly increased with the treatments, bulk soil pH decreased with PGPR treatments when compared with all other treatments. EC values in rhizosphere and bulk soils were not significantly influenced with the treatments. Rhizospheric and bulk soil showed high amount of N, P and organic matter in PGPR treatments. Alkaline phosphatase and βglucosidase activities were found significantly higher in the last treatment than the other treatments. Basal soil respiration was interestingly found higher in control soil but did not differ statistically from the other treatments. Concluding, application of PGPR with lower amounts of chemical fertilizers can reduce the use of chemical fertilizers and has also potential of improving soil health in long term aspects.

Effect of Some Mineral and Bio Fertilization Treatments on Yield and Yield Components of Bread Wheat Under Two Seeding Rates

“…Results of Attia and Abd El-Salam, 2016 emphasized that biofertilization is not a substitute but a partial supplement or the recommended NPK mineral fertilizers which could be ascribed partially to the increased mobility of fixed nutrients like P in the soil or fixing more N which reflected directly on most growth and yield characters of wheat in sandy soils. were results are in harmony with previous findings of Namvar and Khandan, 2013;Namli et al 2017;Karimi and Marashi, 2017;Khalilzadeh et al, 2018 andSingh et al, 2018.…”

“…They can play significant role in fixing atmospheric N and production of plant growth promoting substances (Attia and Abd El Salam, 2016). Many studies had addressed the advantageous effects of bacterial inoculation on plant physiology and growth of wheat (Singh et al, 2018, Namli et al, 2017and Khalilzadeh et al, 2018. The inoculation with bio-fertilization had significant effect on plant height, grain weight spike -1 , number of spikes m -2 , number of grains spike -1 , 1000grain weight, grain, straw and biological yields in wheat plants (Namvar and Khandan, 2013 as well as Karimi and Marashi, 2017).…”

Influence of Isolated PGPR Rhizobacteria in Central and Northern Benin on Maize Germination and Greenhouse Growth

“…Similar increases in absorption of the macronutrients include nitrogen and phosphorus have been reported in the host plant after inoculation of wheat grain by S. marcescens [62]. These observations have also been confirmed by [63] [64].…”

Microbial fertilizer from PK rocks on lettuce nutrients and soil attributes in consecutive crops

“…Soil pH was affected by the fertilization treatments, decreasing significantly when the microbial fertilizer was applied at increasing rates, probably due to the presence of the Acidithiobacillus oxidizing bacteria, which metabolically produces sulfuric acid, whose acidity increases the release of P and K from rocks. Some authors agree that the addition of microorganisms for P and K solubilization reduce soil pH and, in some conditions, may release organic acids (Namli et al, 2017). Stamford et al (2007Stamford et al ( , 2009Stamford et al ( , 2015, for example, observed a reduction in soil pH when sulfur inoculated with Acidithiobacillus was applied to a soil of the Brazilian semiarid region.…”