eprintid: 4573
rev_number: 8
eprint_status: archive
userid: 30
dir: disk0/00/00/45/73
datestamp: 2011-11-30 12:54:04
lastmod: 2011-11-30 12:54:04
status_changed: 2011-11-30 12:54:04
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
item_issues_count: 0
creators_name: Sahrawat, K L
icrisatcreators_name: Sahrawat, K L
affiliation: ICRISAT(Patancheru)
country: India
title: Mineralization of soil organic nitrogen under waterlogged conditions in relation to other properties of tropical rice soils
ispublished: pub
subjects: s2.11
subjects: s2.5
full_text_status: restricted
note:    I thank the International Rice Research Institute for financial support and Dr F.
N. Ponnamperuma, Principal Soil Chemist, IRRI, for helpful comments during
planning work and preparation of the manuscript

abstract: The mineralizable nitrogen pool in wetland rice soils plays a dominant role in the nitrogen nutrition of rice even in fertilized paddies. There is a lack of information on how different soil properties affect ammonification of organic nitrogen in wetland rice soils. Surface samples of 39 diverse Philippine soils representing a wide range of pH, organic matter and texture were studied to determine the relationships between ammonification of organic nitrogen and soil properties. Simple correlation analysis showed that ammonium production was correlated highly significantly with total nitrogen (r = 0.94**), organic carbon (r = 0.91**) and C/N ratio (r = -0.46**), but it was not significantly correlated with cation exchange capacity, clay or pH. Multiple regression analayses showed that organic matter (organic carbon and total nitrogen) accounted for most of the variation in mineralizable nitrogen. These results suggest that organic carbon content is a good index of mineralizable nitrogen in tropical wetland rice soils.
date: 1983
date_type: published
publication: Australian Journal of Soil Research
volume: 21
number: 2
publisher: CSIRO Publishing
pagerange: 133-138
refereed: TRUE
issn: 0004-9573
official_url: http://dx.doi.org/10.1071/SR9830133 
related_url_url: http://scholar.google.co.in/scholar?hl=en&q=allintitle%3A+%22Mineralization+of+soil+organic+nitrogen+under+waterlogged+conditions+in+relation+to+other+properties+of+tropical+rice+soils%22&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=0
related_url_type: author
funders: International Rice Research Institute
citation:   Sahrawat, K L  (1983) Mineralization of soil organic nitrogen under waterlogged conditions in relation to other properties of tropical rice soils.  Australian Journal of Soil Research, 21 (2).  pp. 133-138.  ISSN 0004-9573     
document_url: http://oar.icrisat.org/4573/1/Aus_Jo_Soil_Res_21_2_133-138_1983.pdf