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علوم خاک soil-science - ظرفیت نگهداری آب در خاک (field capacity)
علوم خاک soil-science
پیش به سوی کشاورزی پایدار با نگرش صحیح به خاک

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ظرفیت نگهداری آب در خاک (field capacity)

ظرفیت نگهداری آب در خاک (field capacity)

حداکثر مقدار آبی که خاک می تواند در شرایط زهکشی در خود نگهداری کند ظرفیت نگهداری آب در خاک نامیده می شود. به عبارت دیگر این ظرفیت معرف توانایی یک توده خاک برای نگهداری آب در مقابل نیروی ثقل می باشد و مقدار آن به حد بالای آب کاپیلاریته مربوط است. ظرفیت نگهداری آب در خاک ارتباط مستقیم با میزان خلل و فرج دارد و در واقع قسمت اعظم مقدار آبی که نمایانگر این ظرفیت است خلل و فرج ریز خاک را پر می نماید. بافت که تعیین کننده کمیت و درشتی و ریزی خلل و فرج می باشد و در معرفی ظرفیت مزبور مؤثرند. در یک خاک که ساختمان فیزیکی مطلوب تر دارد هر قدر ذرات جامد تشکیل دهنده خاک و خاکدانه کوچکتر باشد مجموع سطوح ذرات مزبور زیادتر و نیروی نگهدارنده آب در خاک بیشتر خواهد بود.  

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