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علوم خاک soil-science - خلل و فرج خاک ( منافذ خاک) pores of Soil
علوم خاک soil-science
پیش به سوی کشاورزی پایدار با نگرش صحیح به خاک

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خلل و فرج خاک ( منافذ خاک) pores of Soil

خلل و فرج خاک ( منافذ خاک)

به طوری که قبلاً گفته شد در یک خاک خوب کشاورزی خلل و فرج آن به طور مساوی از آب و هوا پر شده است. بنابراین در هر خاکی که میزان این خلل و فرج دستخوش تغییرات شدید قرار گیرد زندگی گیاه به خطر می افتد. خلل و فرج را بر اساس ریزی و درشتی به دو نوع تقسیم می کنند. اگر خلل و فرج کوچک باشد micropore و اگر بزرگ باشد macropore گویند. میکروپورها اختصاص به ذخیره آب و ماکروپورها اختصاص به جریان هوا .
بنابراین در یک خاک خوب کشاورزی می بایست به یک نسبت مساوی ماکروپور و میکروپور حجم خاک را تشکیل دهند (25/0 هوا – 25/0 آب) برای مطالعه خلل و فرج دو نکته بایستی مورد مطالعه قرار گیرد:
الف) وزن مخصوص ظاهری خاک
ب) وزن مخصوص حقیقی خاک
 

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