تأثیر عمق و سرعت خاکورزی بر برخی ویژگی‌های فیزیکی و هیدرولیکی خاک سطحی

نوع مقاله : مقاله پژوهشی

10.22092/ijsr.2016.106360

چکیده

به منظور بررسی تأثیر عمق و سرعت خاکورزی بر خصوصیات فیزیکی و هیدرولیکی خاک، تحقیقی در قالب طرح کرت­های خرد شده نواری (طرح پایه بلوک­های کاملاٌ تصادفی) با لحاظ دو سطح عمق و سرعت خاکورزی انجام گردید. تیمارها با گاوآهن برگردان در سه تکرار اجرا شدند. آزمایش­های سرعت نفوذپذیری با نفوذسنج دیسک در مکش­های 15-، 6-، 3- و صفر سانتی­متر و جرم مخصوص ظاهری با نمونه­های دست­نخورده اندازه­گیری شد و بافت خاک لوم رسی طبقه­بندی شد. نتایج نشان داد که Ks (سطح 5%) و K3 (سطح 1%) به طور معنی­داری تحت تاثیر سرعت خاکورزی قرار گرفتند، درحالیکه تأثیر عمق خاکورزی و اثر متقابل فاکتورها بر آنها غیرمعنی­دار بود. تأثیر دو فاکتور عمق و سرعت خاکورزی و اثر متقابل آنها بر K6 و ضریب α گاردنر غیرمعنی­دار و بر جرم مخصوص ظاهری خاک سطحی (سطح 5%) معنی­دار بود. مقادیر K15 تحت تأثیر عمق خاکورزی (سطح 5%) اختلاف معنی­دار داشت ولی سرعت خاکورزی بر روی جرم مخصوص ظاهری خاک زیرسطحی تأثیری نداشت. 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Tillage Depth and Speed on Top Soil Physical and Hydraulic Properties

چکیده [English]

In order to evaluate the effect of tillage depth and speed on soil physical and hydraulic properties, this research was performed in a clay loam soil. Moldboard plow treatments in three replications were employed in a completely randomized block design with a split tape according to both speed and depth of tillage. Infiltration of soil was determined in undistributed samples by using disc infiltrometer apparatus under -15, -6, -3 and 0 cm H2O suctions (K15, K6, K3, Ks).  The results revealed that the tillage speed had significant effect on K3 and Ks at 5% and 1% probability level, respectively, whereas deep tillage as well as interaction of the factors did not affect them. Both of the studied factors (depth and speed) and their interaction had no significant effect on K6 and Gardener α coefficient, while they had significant effect on the bulk density of top soil at 5% probability level. Furthermore, K15 showed significant differences under the effect of tillage depth at 5% probability level. The results also indicated that speed of tillage had no effect on the bulk density of sub-surface layers. 

کلیدواژه‌ها [English]

  • Soil hydraulic conductivity
  • Disc Infiltrometer
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