organic materials and rice cultivars on methane emission from rice field
Maninder Kaur Khosa*, B.S. Sidhu and D.K. Benbi
of Soils, Punjab Agricultural University, Ludhiana
- 141 001, India
(Received: March 05, 2009; Revised
05, 2009; Accepted: August 26, 2009)
Abstract: A field experiment was conducted for
two years on a sandy loam (Typic Ustochrept) soil of Punjab
to study the effect of organic materials and rice cultivars on methane emission
from rice fields. The methane flux varied between 0.04 and 0.93 mg m-2
hr-1 in bare soil and transplanting of rice crop doubled the methane
flux (0.07 to 2.06 mg m-2 hr-1). Among rice cultivars,
significantly (p < 0.05) higher amount of methane was emitted from Pusa 44
compared to PR 118 and PR 111. Application of organic materials enhanced
methane emission from rice fields and resulted in increased soil organic carbon
content. The greatest seasonal methane flux was observed in wheat straw amended
plots (229.6 kg ha-1) followed by farmyard manure (111.6 kg ha-1),
green manure (85.4 kg ha-1) and the least from rice straw compost
amended plots (36.9 kg ha-1) as compared to control (21.5 kg ha-1).
The differential effect of organic materials in enhancing methane flux was
related to total carbon or C:N ratio of the material.
The results showed that incorporation of humified organic matter such as rice
straw compost could minimize methane emission from rice fields with co-benefits
of increased soil fertility and crop productivity.
words: Methane flux, Organic
materials, Rice cultivar, Greenhouse gases, Global
PDF of full length
paper is available online
© 2010 Triveni Enterprises. All rights reserved. No part of the Journal can be
reproduced in any form without prior permission. Responsibility regarding
the authenticity of the data, and the acceptability of the conclusions enforced
or derived, rest completely with the author(s).