Effect of vermicompost, cow manure, rice residual and Azolla integrated with plant growth promoting rhizobacteria on yield and some ecophysiological characteristics of rice

Ghadimi, Mehdi (2021) Effect of vermicompost, cow manure, rice residual and Azolla integrated with plant growth promoting rhizobacteria on yield and some ecophysiological characteristics of rice. Doctoral thesis, University of Zabol.

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Abstract

A field experiment was conducted in a paddy soil in 2018-2017 for investigating the effect of vermicomposting of cow manure mixture with Azolla and rice straw on soil microbial activity, nutrient uptake and grain yield under inoculation of N2-fixing bacteria. Experimental factors consisted of organic amendments in six levels (vermicomposts prepared from manure (VM); manure + rice straw (VRM); manure + Azolla mixture (VAM); manure + rice straw + Azolla mixture (VRAM); raw manure without vermicomposting (M) and a control) and N2- fixing bacteria in three levels (Azotobacter chroococcum, Azospirillum brasilence and noninoculation). The results showed that vermicompostic treatments compared to control and raw manure significantly increased the number and biomass-C of soil microorganisms, urease activity, number of tillers hill-1, phosphorus (P) and potassium (K) uptake, and grain and protein yield. Inoculation of plants with N2-fixing bacteria, especially Azotobacter, increased the efficiency of organic amendments, so that the maximum urease activity, soil microbial activity, P and N uptake and grain yield (4667 (2017) and 5081 (2018) kg ha-1) were observed in vermicompost treatments containing Azolla (VAM and VRAM) under inoculation with Azotobacter. The results suggest that an organic source for vermicompost has a great effect on enzyme activity, soil biology, nutrient uptake and grain yield, by inoculation with appropriate N2-fixing bacteria, has a synergistic interaction on agronomic traits under flooded conditions. Therefore, this nutrient method can be used as one of the nutrient management strategies in the sustainable rice production.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: Azolla; cow manure; grain yield; microbial activity; paddy soil
Subjects: S Agriculture > SB Plant culture
Depositing User: Mrs najmeh khajeh
Date Deposited: 08 Oct 2022 07:57
Last Modified: 08 Oct 2022 07:57
URI: http://eprints.uoz.ac.ir/id/eprint/3180

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