نوع مقاله: مقاله علمی- پژوهشی

نویسنده

دانشگاه اراک

چکیده

در این تحقیق اثر سرعت استوانه کوبش و نرخ تغذیه مواد در عملیات خرمنکوبی بر میزان آسیب دانه‌ گندم بررسی شد. یک ماشین خرمنکوب چکشی محلی جهت کوبش دانه‌های گندم در سه سطح مختلف سرعت استوانه کوبش (11، 20 و 7/36 متر بر ثانیه) و در سه نرخ تغذیه (013/0، 025/0 و 05/0 کیلوگرم بر ثانیه) استفاده گردید. افزایش سرعت استوانه از 11 به 20 متر بر ثانیه، آسیب‌های قابل مشاهده را از 01/0% به 95/1% و غیر قابل مشاهده را از 13/2% به 5/16% افزایش داد. با افزایش سرعت استوانه به 7/36 متر بر ثانیه، آسیب‌های قابل مشاهده به 3/24% و آسیب‌های غیر قابل مشاهده به 85/36% رسید. از طرف دیگر با افزایش نرخ تغذیه از 013/0 تا 025/0 و سپس 05/0 کیلوگرم بر ثانیه، درصد دانه‌های شکسته به‌ترتیب به 17/21% و 8/31% کاهش یافت. آزمون جوانه‌زنی نشان داد که هر دو نوع جوانه‌زنی (قابل مشاهده و پیشنهادی) با افزایش سرعت استوانه، کاهش و با افزایش نرخ تغذیه، افزایش می‌یابد. میزان رسانایی الکتریکی دانه‌های خرمنکوبی شده رابطه مستقیمی با افزایش سرعت استوانه و کاهش نرخ تغذیه دارد. رقم‌های Sids10 و Sohag1 به‌ترتیب بادوام‌ترین و ضعیف‌ترین رقم به‌کار رفته در این تحقیق است.

کلیدواژه‌ها

عنوان مقاله [English]

Effects of Drum Speed and Feed Rate on Damaged Wheat Grain During Threshing Operation

نویسنده [English]

  • A Imanmehr

Arak University

چکیده [English]

In this research the effects of drum speed and feed rate on the amount of wheat grain damages during threshing operation were investigated. A local flail type threshing machine for threshing wheat at three different drum speeds (11, 20 and 36.7 m/s) and at three different feed rates (0.013, 0.025 and 0.05 kg/s) was used. Increasing drum peripheral speed from 11 to 20 m/s has been resulted in increasing visible and invisible damages from 0.01% to 1.95% and from 2.13% to 16.5%, respectively. Increasing drum peripheral speed up to 36.7 m/s the visible and invisible damages observed as 24.3% and 36.85%, respectively. On the other hand, increasing the machine feed rate from 0.013 to 0.025 kg/s and then to 0.05 kg/s, the percent of broken seeds were decreased by 21.17% and 31.8%, respectively. The germination test showed that the both type of germinations (visible and propositional) decreased with increasing drum speed and increased with increasing feed rate. The electrical conductivity of the threshed seeds had a direct relationship with increasing the drum speed and decreasing the feed rate. The Slids10 and Sohag10 varieties were the toughest and the most weakened varieties, respectively in this investigation.

کلیدواژه‌ها [English]

  • Wheat grain,Threshing, Mechanical damage, Grain quality
  • Germination test

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