The research of glyphosate herbicide distribution
in soil is important because of the contribution to
the knowledge. The goals of the research were to:
i). know the distribution pattern of glyphosate
herbicide which infiltrated in the soil, ii).
understand the effects of glyphosate herbicide
residues on soil properties and plant growth.
There were three soil subgroups (Typic Udifluvent,
Andic Dystrudept, and Typic Dystrudept)
that prepared into soil columns and treated with 3
kg/ha glyphosate. Results showed that the
distribution of glyphosate in soil is mostly
influenced by soil texture, especially the clay. The
soil with textural classes of sand, loam and clay at
field capacity condition adsorbed glyphosate until
62%, 91%, and 99% respectively after the
glyphosate applicated through soil surface. Water
infiltration was equivalent to 2x125 mm rainfall.
Concentration of glyphosate residue on the lower
layer increasing on sand texture and vice verse
decreasing on clay texture. The residues of
glyphosate changed several properties of soil,
both chemical and biological. Effects of glyphosate
residue increased P-available, decreased
Fe-available, total microorganism number,
Rhizobium, and phospho-solubilizing bacteria on
all three class textures.