Volume 14, Issue 5 (2012)                   JAST 2012, 14(5): 1173-1183 | Back to browse issues page

XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Mousavi S F, Moazzeni M, Mostafazadeh-Fard B, Yazdani M R. Effects of Rice Straw Incorporation on Some Physical Characteristics of Paddy Soils. JAST 2012; 14 (5) :1173-1183
URL: http://jast.modares.ac.ir/article-23-10382-en.html
1- Isfahan University of Technology
2- Rice Research Institute
Abstract:   (6524 Views)
The prevalent method of irrigation in paddy fields in Iran is continuous ponding, which changes to intermittent method at the time of water shortage. Soil cracks are the main problem in intermittent irrigation. In this study, effects of adding rice straw on some soil physical characteristics and cracks were studied in paddy soils of the Guilan Province of Iran. The experiment was performed as split-split plots based on a complete randomized blocks design. Treatments included four soil textures (silty clay, silty clay loam, clay loam, and sandy loam), seven rates of rice straw (0, 2, 3, 4, 5, 6 and 7% by weight), and three soil moisture stages of drying conditions [primary stage (T1), initial crack stage (T2), final crack stage (T3)]. Results revealed that soil texture, rice straw rate, crack treatments, and their interactions had significant (P< 0.01) effects on soil moisture content, bulk density, and time to crack formation. During the drying stage (from T1 to T3), moisture content decreased, however, bulk density and time to crack formation increased. In silty clay soil, addition of 2-3% rice straw expedited crack formation, and an addition of 4-7% straw delayed crack formation. In silty clay loam soil, addition of 3-5% straw enhanced crack formation, and addition of 6-7% delayed crack formation. The addition of rice straw in clay loam and sandy loam delayed crack formation. In general, addition of rice straw increased soil moisture content, decreased bulk density, and delayed crack formation.
Full-Text [PDF 216 kb]   (7981 Downloads)    
Article Type: Research Paper | Subject: Irrigation and Drainage
Received: 2010/11/30 | Accepted: 2011/06/29 | Published: 2012/07/14

Add your comments about this article : Your username or Email:
CAPTCHA

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.