By Janis Mc Farland, Orvin Burnside, Homer M. LeBaron
Over the last 50 years, triazines have made a very good impression on agriculture and global starvation by way of aiding within the improvement of latest farming equipment, supplying larger farming and land use features, and lengthening crop yields. Triazines are registered in over eighty international locations and keep billions of greenbacks a 12 months. The Triazine Herbicides is the single e-book that offers a finished view of the full technology and agriculture of those chemical substances. With emphasis on how the chemical substances are studied and built, reviewed, and used on the agricultural point this ebook offers worthy perception into some great benefits of triazine herbicides for sustainable agriculture. * provides formerly unpublished info at the discovery, improvement and advertising and marketing of herbicides* incorporates a important part at the foundation, use, economics and destiny of triazine herbicides* Covers advantages of triazines in corn and sorghum, sugarcane, citrus, fruit and nut plants* Establishes most sensible administration perform and environmental merits of use in conservation tillage
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Extra resources for The Triazine Herbicides: 50 years Revolutionizing Agriculture (Chemicals in Agriculture Series)
Var. N Var. N N Var. N Var. Var. (c) Cl (a) C2H5 N Var. (d) N1,2 N Var. N N Var. (a) (b) (c) (d) Var. N N Var. Var. Var. Var. N Var. by varying the N-alkyl radicals; by substituting the chlorine atom by other suitable groups; by permuting most different radicals on the three ring positions allowing substitution; by replacing the s-triazine ring by other N-heterocycles, mainly provided with halogen and alkylamino radicals. 18 History of the Discovery and Development of Triazine Herbicides After having synthesized and tested many representatives we can conclude now that, in general, the following criteria must be fulfilled in order to obtain substantial herbicidal activity: • Two nitrogen functions bound to ring carbon atoms are essential for the typical triazine activity pattern.
A small team of Geigy chemists, biologists, and agronomists made excellent progress in turning that initial concept into not only new compounds, but a new field of weed control research. Geigy’s principal scientist for chemical synthesis, Dr. Enrico Knüsli, started modifying existing chemicals known to have an effect on plants, utilizing new molecular concepts that might be more successful in controlling weeds. Knüsli altered a triazine ring with new active groups and discovered a tremendous source for new compounds with herbicidal properties: the 4,6-dialkylamino-s-triazines.
This property made simazine a welcomed product for industrial (nonselective) weed control and for use in fruit orchards, grape vineyards, and forestry. Simazine was often used in mixture with a partner from the group of methylthiotriazines or other herbicides. G-27901, trietazine: Coming out of early synthesis together with simazine, trietazine showed an increased selectivity in potatoes and tobacco. However, tests over several further seasons showed an unreliable crop tolerance safety margin, which led to a decision that this compound would not be developed for general use.