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Primary heavy duty disc harrows of 265 to 1,000 pounds (120 to 454 kg) per disc are mainly used to break up virgin land, to chop material/residue, and to incorporate it into the top soil. Lighter secondary disc harrows help completely incorporate residue left by a primary disc harrow, eliminate clumps, and loosen the remaining packed soil.
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In cooler climates, the most common types are the disc harrow, the chain harrow, the tine harrow or spike harrow and the spring tine harrow. Chain harrows are often used for lighter work, such as leveling the tilth or covering the seed, while disc harrows are typically used for heavy work, such as following ploughing to break up the sod.
As this is dragged forward, the sharp edge of the disc cuts the soil, and the concave surface of the rotating disc lifts and throws the soil to the side. It does not work as well as a mould-board plough (but this is not seen as a drawback, because it helps to fight wind erosion), but it does lift and break up the soil (see disc harrow).
National Geographic (Nat Geo Asia, formerly NBC Asia and National Geographic Channel and also commercially abbreviated and trademarked as Nat Geo or Nat Geo TV) is a pan-Asian subscription television channel owned by Disney Networks Group Asia Pacific (through NGC Network Asia, LLC).
Mono 29; Country: Thailand: Broadcast area: Thailand (via DVB-T2) Malaysia (Perlis, Kedah, Perak, Kelantan and Terengganu) Myanmar (areas of Tachileik, Myawaddy, parts of Mawlamyine, and southernmost part of Tanintharyi Region)
Cinemax Asia (which is the secondary channel of HBO Asia) was launched in 15 November 1996, it is a 24-hour movie channel which features movies in horror, suspense, thriller and action.
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