Experimental evaluation of a fluted feed roller metering device performance in a pneumatic grain drill for rapeseed planting

Document Type : Research Paper


1 Biosystems Engineering Department, College of Agriculture, Shiraz University, Shiraz,. Iran

2 Biosystems Engineering Department, College of Agriculture, Shiraz University, Shiraz, Iran

3 Biosystems Engineering Department, School of Agriculture, Shiraz University, Shiraz, I.R. Iran



In the present study, the application feasibility of an air-assisted centralized metering device equipped with a fluted feed roller was investigated. The performance of the proposed metering device for rapeseed planting was evaluated in the laboratory. For this purpose, effects of rotational speed (n) of the metering device shaft (at levels of 46.5, 48, 79, and 96 rpm), active roller length, L, (at levels of 1/6, 1/4, and 1/3 of the total length of the fluted roller), and number (N) of seed delivery tubes (at levels of 16, 24, and 32 outlets) on the seed weight delivery coefficient of variation (CV) and seeding rate (SR, kg ha-1) were investigated. A factorial experiment arranged as a completely randomized design with three replications was used to perform the laboratory experiments. Results showed that the effects of all treatments (n, L, and N) on both SR and CV were significant. The interactions of N×L and L×n were also significant on both SR and CV. The interaction of N×n was significant only on the SR. The interaction of N×L×n was also significant on the SR. Results of mean comparisons revealed that the CV decreased as n and L increased; whereas, it increased as N increased. However, the opposite pattern was observed for the SR with changing the mentioned factors. Minimum SR value (6.1 kg ha-1 – in the recommended SR range for rapeseed planting) was obtained at 46.5 rpm and L1 (1/6 of the total length of the fluted roller) with 32- outlet seed delivery tube.


Article Title [Persian]

ارزیابی آزمایشگاهی عملکرد موزع غلتکی شیاردار در خطی‌کار نیوماتیک برای کشت کلزا

Authors [Persian]

  • محمد امین نعمت اللهی 1
  • محمد امیرحاجلو 2
  • سید حسین کارپرورفرد 3
  • مهدی مرادی 3
  • هادی عظیمی نژادیان 2
1 بخش مهندسی بیوسیستم، دانشکده کشاورزی دانشگاه شیراز، شیراز، ج.ا. ایران
2 بخش مهندسی بیوسیستم، دانشکده کشاورزی دانشگاه شیراز، شیراز، ج.ا. ایران
3 بخش مهندسی بیوسیستم، دانشکده کشاورزی شیراز، دانشگاه شیراز، شیراز، ج.ا. ایران
Abstract [Persian]

در پژوهش حاضر، امکان‌سنجی بکارگیری یک خطی‌کار هوایی با موزع مرکزی، مجهز به موزع غلتکی شیاردار، مورد بررسی قرار گرفت. کارآیی موزع پیشنهادی برای کشت کلزا، در آزمایشگاه ارزیابی شد. برای این منظور، اثر تیمارهای سرعت دورانی محور موزع غلتکی (در  سطوح 46/5، 48، 79 و 96 دور بر دقیقه)، طول مؤثر موزع (در سطوح 1/3، 1/4،1/6 و  از طول کل موزع استوانه شیاردار) و تعداد لوله‌های سقوط (در سطوح 16، 24 و 32 عدد)، روی ضریب تغییرات وزن بذر و میزان بذر ریخته شده (کیلوگرم در هکتار) مورد بررسی قرار گرفتند. این پژوهش به صورت آزمایش فاکتوریل در قالب طرح کاملاً تصادفی و در سه تکرار، انجام گرفت. نتایج نشان داد که همه تیمارها، اثر معنی‌داری بر ضریب تغییرات وزن بذر و میزان بذر ریخته شده در هکتار دارند. اثر متقابل بین تعداد لوله‌های سقوط و موقعیت کشوئی موزع و بین سرعت دورانی و موقعیت کشوئی موزع بر صفات مورد اندازه‌گیری، معنی‌دار بود. اثر متقابل بین تعداد لوله‌های سقوط و سرعت دورانی موزع، فقط بر میزان بذر ریخته شده در هکتار معنی‌دار بود. همچنین، اثر سه‌گانه هر سه متغیر بر میزان بذر ریخته شده در هکتار معنی‌دار بود. با مقایسه میانگین‌ها، مشخص گردید که با افزایش سرعت دورانی و موقعیت کشوئی موزع، ضریب تغییرات وزن بذر کاهش می‌یابد؛ در حالیکه با افزایش تعداد لوله‌های سقوط، ضریب تغییرات وزن بذر افزایش می‌یابد. اگر چه، با تغییر تیمارهای ذکر شده، الگوی معکوسی برای نرخ بذر ریخته شده، مشاهده گردید. کمینه میزان بذر ریخته شده (6/1 کیلوگرم در هکتار- در محدوده پیشنهادی میزان بذر ریخته برای کشت کلزا)، در سرعت دورانی 5/46 دور در دقیقه و طول مؤثر موزع (  1/6 از طول کل موزع استوانه شیاردار) توسط مقسمی با 32 لوله‌ سقوط بدست آمد.

Keywords [Persian]

  • خطی‌کار
  • ضریب تغییرات
  • کلزا
  • موزع
  • نرخ کاشت بذر
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