Cotton Fields, U.S. 65, Tensas Parish, Louisiana (6) : 無料・フリー素材/写真
Cotton Fields, U.S. 65, Tensas Parish, Louisiana (6) / Ken Lund
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | Cotton is a soft, staple fiber that grows in a form known as a boll around the seeds of the cotton plant, a shrub native to tropical and subtropical regions around the world, including the Americas, India and Africa. The fiber most often is spun into yarn or thread and used to make a soft, breathable textile, which is the most widely used natural-fiber cloth in clothing today. Successful cultivation of cotton requires a long frost-free period, plenty of sunshine, and a moderate rainfall, usually from 600 to 1200 mm (24 to 48 inches). Soils usually need to be fairly heavy, although the level of nutrients does not need to be exceptional. In general, these conditions are met within the seasonally dry tropics and subtropics in the Northern and Southern hemispheres, but a large proportion of the cotton grown today is cultivated in areas with less rainfall that obtain the water from irrigation. Production of the crop for a given year usually starts soon after harvesting the preceding autumn. Planting time in spring in the Northern hemisphere varies from the beginning of February to the beginning of June. The area of the United States known as the South Plains is the largest contiguous cotton-growing region in the world. It is heavily dependent on irrigation water drawn from the Ogallala Aquifer.Cotton is a thirsty crop, and as water resources get tighter around the world, economies that rely on it face difficulties and conflict, as well as potential environmental problems. Most cotton in the United States, Europe, and Australia is harvested mechanically, either by a cotton picker, a machine that removes the cotton from the boll without damaging the cotton plant, or by a cotton stripper, which strips the entire boll off the plant. Cotton strippers are used in regions where it is too windy to grow picker varieties of cotton, and usually after application of a chemical defoliant or the natural defoliation that occurs after a freeze. Cotton is a perennial crop in the tropics and without defoliation or freezing, the plant will continue to grow.en.wikipedia.org/wiki/Cottonen.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_... |
| 撮影日 | 2009-09-10 12:30:34 |
| 撮影者 | Ken Lund , Reno, Nevada, USA |
| タグ | |
| 撮影地 | Wilsona, Louisiana, United States 地図 |
| カメラ | Canon PowerShot A540 , Canon |
| 露出 | 0.002 sec (1/640) |
| 開放F値 | f/4.0 |
| 焦点距離 | 12515.55556 dpi |