The chemicals that are used for suppressing on killing weeds are called herbicides or weedicides, are being used forever 85 years. Many herbicides are used for destruction of weed in this method. Such as-
The introduction of bordeaux mixture in 1896 stimulated interest in chemical weed control. This led to the discovery of copper salts for selective control of broad leaf weeds in cereals. The period between 1896 and 1910 was important for chemical weed control as many chemicals like sulphuric acid, iron sulphate, copper nitrate, ammonium and potassium salts, sodium nitrate, ammoium sulphate etc. Where discovered for weed control.
2.2, 4 – D (2, 4 – Dichlorophenoxy Acitic Acid):
The concept of systematic control of weeds through absorption by roots and top growth of the plant and translocation in the plant body and the use of organic chemicals for weed control took roots with the introduction of nitrophenols as selective herbicides in 1935. The discovery of 2, 4 – D in the early 1940s has, however revolutionized the chemical method of weed control.
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