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Comparison of
the effects of different crop rotation systems on winter
wheat and sunflower under rain-fed conditions
Dogan, R.*, Goksoy. T. A., Yagdi, K.
and Turan, M. Z.
Uludag University, Faculty of Agriculture, Department of
Field Crops, 16059, Bursa, Turkey.
*Corresponding
author.
E-mail:
rdogan@uludag.edu.tr. Fax: +90-(0224)4428836
Accepted 22 September, 2008 |
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The study was made to detect the most suitable crop rotation
system(s) under rain-fed conditions of Southern Marmara
Region, Turkey. In this study (1995-2001), two different
crop rotation systems were carried out: winter wheat and
sunflower as main crops experiments. Results were evaluated
in terms of crop yielding ability, soil fertility and
economic aspects. The sunflower-rapeseed-wheat,
rapeseed-fodder pea + sunflower-wheat and rapeseed-common
vetch + sunflower-wheat were found the most suitable
rotation systems because of their various advantages in the
first experiment in which wheat was used as main the crop.
The highest sunflower seed yields were obtained from a
fodder pea + sunflower-wheat-fodder pea + sunflower crop
rotation system both in the first and second three year
periods in which sunflower was used as main crop under
rain-fed conditions. Economic analysis based on the second
three-year results of the research showed that the highest
mean net returns were obtained from the rapeseed-common
vetch + sunflower-wheat and a fodder pea +
sunflower-wheat-fodder pea + sunflower crop rotation systems
under rain-fed conditions. These crop rotation systems were
found the best crop rotation systems under rain-fed
conditions of Southern Marmara region of Turkey. As a
result, the rotation systems including common vetch and
fodder peas as forage plants under rain-fed conditions gave
economically the highest net profit.
Key words:
Crop rotation, rain-fed conditions, winter wheat, sunflower.
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