2010년 12월 17일 금요일

Cotton


                                                                                       
 Cotton

1. lirhtweight  and breathable

2.helpness for people who has senstive skins

3. soft and fliexible

4. easy to wash

5.biodegradeable and renewable resours

Organic cotton

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Organic cotton yarn
Organic cotton is generally understood as cotton, from non genetically modified plants, that is to be grown without the use of any synthetic agricultural chemicals such as fertilizers or pesticides.[1] Its production also promotes and enhances biodiversity and biological cycles.[2] In the United States cotton plantations must also meet the requirements enforced by the National Organic Program (NOP), from the USDA, in order to be considered organic. This institution determines the allowed practices for pest control, growing, fertilizing, and handling of organic crops.[3][4] As of 2007, 265,517 bales of organic cotton were produced in 24 countries and worldwide production was growing at a rate of more than 50% per year.[5]

Pesticides
Since organic cotton is grown without the use of synthetic pesticides, it should contain fewer pesticides than conventional cotton. Pesticides used in the production of conventional cotton include orthophosphates such as phorate and methamidophos, endosulfan (highly toxic to farmers[15], but not very environmentally persistent) and aldicarb.[16]. Other pesticides persisting in cotton fields in the United States include Trifluralin, Toxaphene and DDT [17]. Although the last two chemicals are no longer used in the United States [18] their long breakdown period and difficulty in removal ensures their persistence. Thus even organic cotton fields may contain them since conventional cotton fields can be transitioned to organic fields in 2–3 years.

Production
Production requirements are specifically the set of changes that must be made to field and farming practices in order for a crop to be considered organic. To begin with, organic fields must go through a cleansing period of three years, without the use of any prohibited substances, before planting the first organic crop. Fields must also be equipped with physical barriers and buzzers in order to prevent contact of organic crops with any chemical substance product of surface runoff from crops near by. Producers must also strive to promote soil fertility through cultivation practices while maintaining or improving the physical, chemical, and biological condition of the soil and minimizes soil erosion. Organic growers must also implement practices to support biodiversity. Such practices include integrated pest management (IPM), which consists of the manipulation of ecosystems that benefit both the crops and the organisms that live around it. In addition to these practices, producers may only apply crop nutrients and soil amendments included on the National List of synthetic substances allowed in crop production.
http://en.wikipedia.org/wiki/Organic_cotton

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