Interactions of two crop rotations and nitrogen levels on grain yield and its components of two bread wheat cultivars under dryland conditions in Shiraz
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Abstract: (3919 Views) |
Field experiments were conducted in 2002-2003 and 2003-2004 cropping season to determine the effects of crop rotation and N fertilizer on yield and yield components of two wheat (Triticum aestivum L.) varieties under Bajgah (near shiraz) dryland condition. Treatments included two rotations (wheat-lentil and wheat-fallow), three N fertilizer rates (0, 30, and 60 kg N ha–1), and two wheat varieties (Niknejad and Zagros). A split Factorial design with three replications was used. Interaction of nitrogen and variety on grain yield and yield components were significant, the highest grain yield obtained from 60 kg N ha–1 and Niknejad in two years (101.5 g/m2 at the first year and 125.7 g/m2 at the second year) and the lowest grain yield was obtained from 0 kg N ha–1 and Zagros in two years (71.3 g/m2 at the first year and 73.4 g/m2 at the second year). Maximum number of spike per m2 in the first year was obtained from 30 kg N ha–1 and Niknejad (271) and in the second year from 60 kg N ha–1 and Niknejad (282.9). Minimum number of spike per m2 was obtained from 0 kg N ha–1 and Zagros in two years (202 in the first year and 213.4 in the second year). Maximum number of grain per spike was obtained from 60 kg N ha–1 and Niknejad in two years (11 in the first year and 11.5 in the second year) and minimum number of grain per spike was obtained from 0 kg N ha–1 and Niknejad in the first year (8.2) and from 0 kg N ha–1 and Zagros in the second year (8.7). Interaction of nitrogen and crop rotation on grain yield and yield components was significant, the highest grain yield obtained from 60 kg N ha–1 and wheat-lentil rotation in two years (100 g/m2 at the first year and 120.4 g/m2 at the second year) and the lowest grain yield was obtained from 0 kg N ha–1 and wheat-lentil rotation in the first year and from 0 kg N ha–1 and wheat-fallow rotation in the second year (74 g/m2 at the first year and 76.8 g/m2 at the second year). Maximum number of spike per m2 in the first year was obtained from 60 kg N ha–1 and wheat-fallow rotation (266.7) and in the second year from 60 kg N ha–1 and wheat-lentil rotation (281.3). Minimum number of spike per m2 was obtained from 0 kg N ha–1 and wheat-fallow rotation in two years (207.2 in the first year and 218.7 in the second year). Maximum number of grain per spike was obtained from 60 kg N ha–1 and wheat-lentil rotation in two years (10.7 in the first year and 11.7 in the second year) and minimum number of grain per spike was obtained from 0 kg N ha–1 and wheat-lentil rotation in two years (8 in the first year and 8.7 in the second year). Increasing nitrogen level had no significant effect on soil organic carbon in the first year but, in the second year, maximum rate of soil organic carbon was obtained from 30 kg N ha–1 (0.99%), although 30 and 60 kg N ha–1 (0.95%) had no significant difference. In the first year, rotations had no significant effect on soil organic carbon, but in the second year, soil organic carbon was higher in wheat-lentil (0.96%) than wheat-fallow (0.90%). |
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Keywords: Crop rotation, Fallow, Lentil, Nitrogen, Yield, Yield components, Wheat |
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Full-Text [PDF 212 kb]
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Type of Study: Scientific & Research |
Subject:
Special Received: 2015/02/28 | Accepted: 2015/02/28 | Published: 2015/02/28
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