| 摘要 |
Product for application as phytotoxic agent contains as active agent an ammonium salt (I) of N-(phosphonomethyl)-glycine (NPMG). (I) is pref. the monoammonium salt (IA). Also claimed are: (i) conc. compsns. for on-site prepn. of phytotoxic formulatons by dissolution in water, consisting of powder or granules contg. (I) and one or more adjuvants selected from wetting agents, surfactants and powders; and (ii) phytotoxic prepns. contg. (I) and a vehicle. USE/ADVANTAGE - (I) is a water-soluble form of the phytotoxic agent (herbicide) NPMG, i.e. glyphosate, NPMG is useful for post-emergence control of undesirable vegetation, including established and aquatic vegetation. Compared with the monoisopropanolamine salt (II) of NPMG (previously used as water-soluble form of NPMG). (I) have comparabel activity, lower toxicity and higher content of NPMG. (I) are stable crystalline solids, which are easier and cheaper to transport in bulk (e.g. in sacks) than (II) (transported as 48% aq. soln.). Pref. concn. (I)-contg. compsns. contain kaolin, attapulgite, silica or diatomaceous earth as powder additive, polyethoxylated nonylphenol or sodium lanylsulphate as surfactant; and polyvinyl alcohol or sodium naphthalenesulphonate as dispersant. In an example, powdered NPMG was added iin portions to a stirred soln. of ammonium carbonate (96g) in water (200 ml) at room temp. The soln. was stirred until CO2 evolution ceased, filtered and concn. to 50 ml. (IA) was pptd. as white crystals. No examples of compsns. contg. (I) are given, although tests are described showing that 90% (IA) has comparable activity with 48% (II).
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