Weed killer
by ZHANG XU
Weed killer is a substance used to kill unwanted plants. Selective weed killers kill specific targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often synthetic “imitations” of plant hormones. Weed killer used to clear waste ground, industrial sites, railways and railway embankments are non-selective and kill 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 weed killers , such as the genus Juglans (walnuts), or the tree of heaven; the study of such natural weed killers, and other related chemical interactions, is called allelopathy.
Weed killer is widely used in agriculture and in landscape turf management. In the U.S., they account for about 70% of all agricultural pesticide use.
Originally posted 2009-09-04 05:32:50. Republished by Blog Post Promoter
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