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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
TJITROSEMITO, S.
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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THE ADSORPTION OF IMAZAPYR BY THREE SOIL TYPES IN INDONESIA TJITROSEMITO, S.
BIOTROPIA No. 6 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1992.0.6.105

Abstract

The adsorption of imazapyr in three Indonesian soil types was investigated with labelled 14 C-imazapyr using Freundlich adsorption isotherm. The availability of adsorbed imazapyr to plants as affected by washing and liming was assayed using root elongation of rice seedlings. Red-Yellow Podsolic soil adsorbed imazapyr more than Andosol and sandy soil of Laladon. 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.
A STUDY ON WEED CONTROL IN SOYBEAN TJITROSEMITO, S.
BIOTROPIA No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1991.0.4.192

Abstract

Two field experiments on weed control in soybeans were carried out at BIOTROP, Bogor, Indonesia from February to June, 1989. The critical period for weed control was found to be between 20 - 40 days after planting of soybean (c. v. Wilis) grown at a planting distance of 40 x 10 cm. It did not coincide with the fastest growth  in  terms of  trifoliate  leaf number. Further studies were suggested  to understand the physiological growth of soybean related to weed control. Pendimethalin at 660- 1320 g a.e./ha applied one day after sowing did not cause any phytotoxic effect to soybean and had good weed control performance.
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