THE ADSORPTION OF IMAZAPYR BY THREE SOIL TYPES IN INDONESIA
AbstractTheÂ adsorptionÂ ofÂ imazapyrÂ inÂ threeÂ IndonesianÂ soilÂ typesÂ wasÂ investigatedÂ withÂ labelled 14C-imazapyrÂ usingÂ FreundlichÂ adsorptionÂ isotherm.Â TheÂ availabilityÂ ofÂ adsorbedÂ imazapyrÂ toÂ plantsÂ as affected by washing and liming was assayed using root elongation of rice seedlings. Red-YellowÂ PodsolicÂ soilÂ adsorbedÂ imazapyrÂ moreÂ thanÂ AndosolÂ andÂ sandyÂ soilÂ ofÂ Laladon.Â The adsorption was greater at lower pH. Washing seemed to reduce the concentration of imazapyr as shown by the increasing length of rice roots. On the other hand liming facilitated higher concentrations of imazapyr in the solution as shown by the reduction of rice root length. The practical implication is discussed.
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