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Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil

A study was conducted to find the effect of long term (24 years) soil macro nutrient deficit condition on total soil microbial population and occurrences of free-living nitrogen fixing and phosphate solubilizing bacteria (PSB) population in wetland rice cultivation system. After the 48th crop cycle...

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Main Authors: Naher, Umme Aminun, Othman, Radziah, Panhwar, Qurban Ali
Format: Article
Language:English
Published: Southern Cross Publishing 2013
Online Access:http://psasir.upm.edu.my/id/eprint/29404/1/Culturable%20total%20and%20beneficial%20microbial%20occurrences%20in%20long-term%20nutrient%20deficit%20wetland%20rice%20soil.pdf
http://psasir.upm.edu.my/id/eprint/29404/
http://www.cropj.com/november2013.html
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spelling my.upm.eprints.294042016-07-12T09:29:34Z http://psasir.upm.edu.my/id/eprint/29404/ Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil Naher, Umme Aminun Othman, Radziah Panhwar, Qurban Ali A study was conducted to find the effect of long term (24 years) soil macro nutrient deficit condition on total soil microbial population and occurrences of free-living nitrogen fixing and phosphate solubilizing bacteria (PSB) population in wetland rice cultivation system. After the 48th crop cycle (two crops of rice grown per year) soil and plant samples were collected before transplanting and maximum tillering stages from plots with the following treatments: (i) Complete fertilizers (NPKSZn), (ii) NPSZn (-K), (iii) NKSZn (-P) (iv) PKSZn (-N), and (v) without fertilizer. The total bacteria, fungus, actinomycetes, free-living nitrogen fixing bacteria and phosphate solubilizing bacteria populations were determined from each treatment. Results showed that total bacteria, fungus and actinomycetes population were high in the "complete fertilizer" treatment and low in "without fertilizer" treatments, which proved that the absence of any single nutrient element (N or P or K) decreased total soil microbial populations. Significantly high free-living nitrogen fixing bacterial population and high biological nitrogen fixation was found in "without N" fertilizer treatment. The highest atmospheric nitrogen fixed in the nitrogen-free broth culture (3.7%) was by the endophytic strains isolated from "without N" treatment. The Population of PSB was high in the "complete fertilizer" treatment. The highest phosphate (P) solubilizing activity (80%) was observed with the isolated PSB in "complete fertilizer" treatments. The isolated strains produced indoleacetic acid at rates of 1-9 mg l-1. The results of soil chemical analysis showed that the soil N reserve was not reduced as compared to P and K, although the soil received the same treatments over the 24 years. In general, total microbial population was significantly affected by the absence of nutrient elements, whereas the absence of nitrogen increased the free-living nitrogen fixing bacteria. Southern Cross Publishing 2013 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/29404/1/Culturable%20total%20and%20beneficial%20microbial%20occurrences%20in%20long-term%20nutrient%20deficit%20wetland%20rice%20soil.pdf Naher, Umme Aminun and Othman, Radziah and Panhwar, Qurban Ali (2013) Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil. Australian Journal of Crop Science, 7 (12). pp. 1848-1853. ISSN 1835-2693; ESSN: 1835-2707 http://www.cropj.com/november2013.html
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description A study was conducted to find the effect of long term (24 years) soil macro nutrient deficit condition on total soil microbial population and occurrences of free-living nitrogen fixing and phosphate solubilizing bacteria (PSB) population in wetland rice cultivation system. After the 48th crop cycle (two crops of rice grown per year) soil and plant samples were collected before transplanting and maximum tillering stages from plots with the following treatments: (i) Complete fertilizers (NPKSZn), (ii) NPSZn (-K), (iii) NKSZn (-P) (iv) PKSZn (-N), and (v) without fertilizer. The total bacteria, fungus, actinomycetes, free-living nitrogen fixing bacteria and phosphate solubilizing bacteria populations were determined from each treatment. Results showed that total bacteria, fungus and actinomycetes population were high in the "complete fertilizer" treatment and low in "without fertilizer" treatments, which proved that the absence of any single nutrient element (N or P or K) decreased total soil microbial populations. Significantly high free-living nitrogen fixing bacterial population and high biological nitrogen fixation was found in "without N" fertilizer treatment. The highest atmospheric nitrogen fixed in the nitrogen-free broth culture (3.7%) was by the endophytic strains isolated from "without N" treatment. The Population of PSB was high in the "complete fertilizer" treatment. The highest phosphate (P) solubilizing activity (80%) was observed with the isolated PSB in "complete fertilizer" treatments. The isolated strains produced indoleacetic acid at rates of 1-9 mg l-1. The results of soil chemical analysis showed that the soil N reserve was not reduced as compared to P and K, although the soil received the same treatments over the 24 years. In general, total microbial population was significantly affected by the absence of nutrient elements, whereas the absence of nitrogen increased the free-living nitrogen fixing bacteria.
format Article
author Naher, Umme Aminun
Othman, Radziah
Panhwar, Qurban Ali
spellingShingle Naher, Umme Aminun
Othman, Radziah
Panhwar, Qurban Ali
Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
author_facet Naher, Umme Aminun
Othman, Radziah
Panhwar, Qurban Ali
author_sort Naher, Umme Aminun
title Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
title_short Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
title_full Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
title_fullStr Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
title_full_unstemmed Culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
title_sort culturable total and beneficial microbial occurrences in long-term nutrient deficit wetland rice soil
publisher Southern Cross Publishing
publishDate 2013
url http://psasir.upm.edu.my/id/eprint/29404/1/Culturable%20total%20and%20beneficial%20microbial%20occurrences%20in%20long-term%20nutrient%20deficit%20wetland%20rice%20soil.pdf
http://psasir.upm.edu.my/id/eprint/29404/
http://www.cropj.com/november2013.html
_version_ 1643829751166533632
score 13.211869

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