Soil research
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Soil references
- [http://books.google.com/books?id=dlAoxg6gX4cC&pg=PA188&lpg=PA188&dq=loosen+soil+review&source=bl&ots=Y8vhoW1zWY&sig=bRCAvH64XNzQ-oEZviAKtMXiICA&hl=en&ei=LHaxSYewL6XyMsyG-IEF&sa=X&oi=book_result&resnum=3&ct=result Subsoil Management Techniques
By Nihal S. Jayawardane, Bobby Alton Stewart]