Volume 9, Issue 2 (2007)
JAST 2007, 9(2): 99-105 |
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Filizadeh H, Rezazadeh A, Younessi Z. Effects of Crop Rotation and Tillage Depth on Weed
Competition and Yield of Rice in the Paddy
Fields of Northern Iran. JAST 2007; 9 (2) :99-105
URL: http://jast.modares.ac.ir/article-23-11177-en.html
URL: http://jast.modares.ac.ir/article-23-11177-en.html
1- Department of Agronomy, Shahed University, P. O. Box: 18151-159, Tehran, Islamic Republic of Iran.
Abstract: (5598 Views)
Crop rotation is one of the essential practices in sustainable agricultural systems, be-cause of its effects on soil fertility and other benefits including a reduction in weed compe-tition. A field experiment was conducted at Chaparsar Rice Research Station, Tonekabon, Iran, from 2002 to 2003 to assess the influence of crop rotation, time of planting, and till-age depth on rice (Oryza sativa L.) yield and density and the biomass of three important paddy weeds. Treatments included the crop rotations of continuous rice and rice-soybean-rice, in combinations with planting times and no tillage, minimum tillage, and chisel plow-ing. Crop rotation had a significant effect on the growth of barnyardgrass (Echinochloa crus-galli), arrowhead (Sagittaria sagittifolia), and water plantain (Alisma plantago-aquatica) weeds. Continuous rice planting produced the highest density of barnyardgrass, arrowhead, and water plantain weeds, compared with a rice–soybean-rice rotation. Weed biomass and weed densities were lower in the rice-soybean-rice rotation than in continu-ous rice. There were a 62.5 and 80% reductions in the weed density and weed biomass re-spectively, in the rice-soybean-rice rotation compared with continuous rice planting. Fewer barnyardgrass, arrowhead and water plantain growth were observed in no-tillage treatments than in minimum tillage and chisel. Therefore, rice yield in rotation treat-ments increased by 17 and 21% in 2002 and 2003, respectively, compared to continuous rice planting.
Subject:
Agronomy
Received: 2010/01/28 | Accepted: 2010/01/28 | Published: 2010/01/28
Received: 2010/01/28 | Accepted: 2010/01/28 | Published: 2010/01/28
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