Application of gibberellic acid at 100 g a.i./ha in July resulted in rapid visual responses in both kikuyu grass and ryegrass swards in the form of elongation and a slight yellowing of foliage. Ground level cuts showed significant dry matter responses of both kikuyu grass and ryegrass to gibberellic acid, but they were smaller than the visual responses indicated. The greatest response from kikuyu was the equivalent of 11 kg DM/ha/day. In both grasses, gibberellic acid affected mainly the vertical distribution of dry matter, as reflected in either the dry matter yield or the proportion of dry matter above 3 cm. There were indications that gibberellic acid reduced regrowth after trimming of both kikuyu and ryegrass.
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