Glyphosate formulations comprising alkoxylated amine surfactants

A herbicidal method which comprises spraying weeds with a spray solution at from about 100 to about 400 liters of solution per hectare, said solution containing

• (a) solubilized glyphosate;
• (b) a surfactant which is (i) an amine having the formula ##STR5## where R represents a straight- or branched-chain alkyl or alkenyl group having from about 8 to about 22 carbon atoms, A represents an alkylene group, and n and n' are integers such that n+n' has a value of from about 2 to about 8, (ii) a mixture of such amines having different groups R, the average number of carbon atoms in the groups R being from about 8 to about 22, or (iii) a mixture of such amines having different values of n and n', n and n' being integers such that in the mixture the average value of n+n' is from about 2 to about 8, R having a single value or an average value as in a mixture (ii);
• and optionally (c) an agriculturally acceptable inorganic ammonium salt;
• the weight ratio of (a) expressed as glyphosate acid equivalent to (b) in the spray solution being from about 1:1.75 to about 6:1, and the concentration of (a) in the spray solution being such that the application rate of glyphosate acid equivalent is from about 0.125 kg to about 1.5 kg per hectare;
• and the weight ratio of (c) to (a) expressed as glyphosate acid equivalent being at most about 3.6:1.