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Effect of Growth Promoting Rhizobacteria on quantitative traits of rice varieties and chemical characteristics of paddy soil

 

Introduction

The use of chemical fertilizers in the past few decades has had adverse environmental effects, such as water and soil pollution, as well as health problems of humans and other living organisms. The use of renewable resources is one of the most sustainable agricultural principles that maximizes agricultural productivity and reduces environmental hazards. Preserving the ecosystem and maximizing plant yield requires the application of modern agronomic strategies, among which the use of biofertilizers can be mentioned. Biological fertilizers are bacterial and fungal microorganisms that, in addition to nitrogen biosolidation and phosphorus solubilization, produce significant amounts of growth stimulating hormones (mainly auxin, gibberellin and cytokinin) on the growth, development and yield of crops, as well as soil characteristics. Affect. The use of growth-promoting bacteria in crop production can, while preserving and improving the physical and chemical properties of the soil, reduce the consumption of various chemical inputs, preserve water and soil from pollution, increase product yield and produce healthy rice to achieve organic agricultural goals and ultimately lead to the sustainability of rice production.

 

Challenges and necessity

The application of the rice root inoculation method with growth-promoting bacteria is a completely new method and in line with the principles of sustainable agriculture, which can lead to the design and implementation of many research projects aimed at reducing the use of chemical fertilizers. Therefore, the results obtained from this research can contribute significantly to a better understanding of growth promoting bacteria role on the performance of different varieties of rice as the dominant crop in the region and the balanced use of fertilizer.

 

Research hypotheses

  1. Does inoculation with non-symbiotic bacteria strains increase yield and yield components of rice?
  2. Is Inoculation with non-symbiotic bacteria strains cause significant changes in chemical characteristics of paddy soils?
  3. Does the inoculation with non-symbiotic bacteria strains cause significant increase in nutrition elements of grain and rice straw?
  4. Is interactions between application of non-symbiotic bacteria strains and rice cultivars significantly increase yield and yield components of rice?
  5. Is interactions between the use of non-symbiotic bacteria strains and rice cultivars significantly alter the chemical composition of the soil?
  6. Is the interaction between non-symbiotic bacteria strains and rice cultivars significantly increase the nutrition elements of grain and rice straw?

 

Objectives

  1. To assess the effect of plant growth promoting bacteria strains on rice quantitative traits.
  2. To Investigate the effects of plant growth promoting bacteria strains on chemical characteristics of paddy soils.
  3. To Investigate the effect of plant growth promoting bacteria strains on the concentration of nutrition elements in grain and rice straw.
  4. To study the interaction between application of plant growth promoting bacteria and rice varieties on rice quantitative traits.
  5. To study the interaction between application of plant growth promoting bacteria and rice varieties on chemical characteristics of paddy soils.
  6. To study the interaction between application of plant growth promoting bacteria and rice varieties on the concentration of nutrition elements in grain and rice straw.

 

Materials and methods

A factorial experiment conducted in a randomized complete block design with three replications that will be implemented at the Research Institute of Rice Research Institute of Iran (Rasht) in two years from 2019 (including two periods of rice cultivation) with the aim of selecting and introducing the best isolate from bacterial species in order to increase the quantitative traits of rice plant and also improve the physical and chemical properties of paddy soils. The experimental factors will be consisted of eight levels of inoculation with non-symbiotic bacteria (control treatment, inoculation with Azotobacter chroococcum, inoculation with Pseudomonas fluorescens P169, inoculation with Azospirillum lipoferum, inoculation with a mixture of Azotobacter and Pseudomonas, inoculation with Azotobacter and Azospirillum mixture, inoculation with the mixture Pseudomonas and Azospirillum and inoculation with a mixture of three different bacteria) and two rice cultivars including Hashemi and Gilaneh.