| 翻訳と辞書 |
Herbicide
Herbicide(s), also commonly known as weedkillers, are pesticides used to control unwanted plants.〔 Selective herbicides control specific weed species, while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often synthetic mimics of natural plant hormones. Herbicides used to clear waste ground, industrial sites, railways and railway embankments are not selective and control all plant material with which they come into contact. Smaller quantities are used in forestry, pasture systems, and management of areas set aside as wildlife habitat.
Some plants produce natural herbicides, such as the genus ''Juglans'' (walnuts), or the tree of heaven; such action of natural herbicides, and other related chemical interactions, is called allelopathy.
In the US in 2007, about 83% of all herbicide usage, determined by weight applied, was in agriculture.〔 In 2007, world pesticide expenditures totaled about $39.4 billion; herbicides were about 40% of those sales and constituted the biggest portion, followed by insecticides, fungicides, and other types.〔EPA. February 2011 (Pesticides Industry. Sales and Usage 2006 and 2007: Market Estimates ). Summary in press release (here ) Main page for EPA reports on pesticide use is (here ).〕
==History==
Prior to the widespread use of chemical herbicides, cultural controls, such as altering soil pH, salinity, or fertility levels, were used to control weeds. Mechanical control (including tillage) was also (and still is) used to control weeds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Herbicide」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|