Field evaluation of a bent leg tillage implement

Document Type : Research Paper


Agricultural Engineering Research Department, Fars Agricultural and Natural Resources and Education Centre, Agricultural Research, Education and Extension Organization, Shiraz I. R. Iran.



This study was aimed to determine the effect of the geometry of a bent leg tillage implement on draft force and specific draft. This research designed as a split-split plot experiment with three replications. Treatments were three soil moisture content levels of 7-10, 10-13 and 13-16 % as main plots, three forward speeds of 5, 7.5 and 10 km h-1 as sub-plots and three lateral blade spacing of 12, 16 and 20 cm as sub-sub-plots. Results indicated that forward speed, lateral blade spacing and soil moisture content affected draft force and specific draft. Reducing soil moisture content from 13-16% to 7-10% increased draft force by 12% and reduced specific draft by 9%. Increasing forward speed from 5 to 10 km h-1 increased draft force and specific draft by 71.8% and 70.7%, respectively. The lateral blade spacing of 16 and 20 cm was recognized to be proper for tilling by the bent leg tillage implement. Other findings showed that the geometry and characteristics of the bent leg tillage have the potential to have reduced draft force at higher levels of the forward speed. 


Article Title [Persian]

ارزیابی مزرعه ای یک دستگاه خاک ورز کج ساق

Authors [Persian]

  • علی اکبر صلح جو
  • محمد شاکر
بخش تحقیقات فنی و مهندسی کشاورزی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، شیراز ج.ا. ایران
Abstract [Persian]

هدف از انجام تحقیق حاضر، تعیین اثر شکل هندسی خاک­ورز کج­ساق بر نیروی کشش مصرفی و مقاومت ویژه بود. این مطالعه در قالب طرح آماری کرت­های دوبار خرد شده با سه تکرار اجرا شد. کرت اصلی، رطوبت خاک شامل 10-7، 13-10 و 16-13 درصد، کرت فرعی، سرعت پیشروی شامل 5، 7/5 و 10 کیلومتر بر ساعت و کرت فرعی- فرعی، فاصله بین تیغه­ های کج­ساق شامل 12، 16 و 20 سانتی­متر بود. نتایج نشان داد که اثر سرعت پیشروی تراکتور، فاصله بین تیغه­ های کج­ساق و درصد رطوبت خاک در زمان خاک­ورزی بر نیروی کشش مصرفی و مقاومت ویژه موثر هستند. کاهش رطوبت خاک از 16-13 به 10-7 درصد، نیروی کشش مصرفی را 12 درصد افزایش و مقاومت ویژه را 9 درصد کاهش داد. افزایش سرعت پیشروی از 5 به 10 کیلومتر بر ساعت به ترتیب نیروی کشش مصرفی و مقاومت ویژه را 71/8 و 70/7 درصد افزایش داد. فاصله عرضی مناسب بین تیغه­ های خاک­ورز کج­ساق 16 و 20 سانتی­متر تشخیص داده شد. دیگر یافته ­ها نشان داد که شکل هندسی و خصوصیات خاک­ورز کج­ساق، پتانسیل کاهش نیروی کشش مصرفی در سرعت پیشروی زیاد را دارد.

Keywords [Persian]

  • شکل هندسی تیغه
  • نیروی کشش
  • کج ساق
  • سرعت پیشروی
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