Effects of different glyphosate doses in pre-sowing desiccation on seedling emergence and plant height of common bean (Phaseolus vulgaris L.)

Responsible: Carlos Kimoto and Karen Ikemori
Objectives:
Effects of glyphosate doses applied for cover crop grass desiccation at pre sowing on common bean seedling emergence and plant height.
Material and Methods:
The experiment was conduced in greenhouse with 4 treatments and 6 replications, in 6 L pots. In each pot Brachiaria grass cv. Mulato was sowed and cultivated until 25 cm height, and afterwards it was desiccated with 20 ml of: 0%, 2%,4% and 8% of glyphosate solution. One day after desiccation 10 seeds of common beans (Phaseolus vulgaris L.) were sowed in each pot. Evaluations of germination were done at 7th to 13th D.A.S. (Days After Sowing) and evaluations of plant height: 7, 14 and 21 D.A.S.
Results:
Growing doses 2, 4, and 8% of glyphosate, when compare to the treatment of 0%, delayed the emergence at 7 D.A.S in 50, 90 and 100% respectively. The plant height, in the treatments 2, 4, and 8% was reduced in 28, 47 and 62% at 7 D.A.S.; 30, 53 and 73% at 14 D.A.S. and 18, 35, 71% at 21 D.A.S., compared to control (without use of glyphosate).

Conclusion:
Growing doses of glyphosate reduced the velocity of emergence and plant height of common bean, when used for desiccation, one day before sowing.