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VOL. 11, ISSUE 1 (2026)
Efficacy of Isopropylamine glyphosate 350 g/l and 2,4-d dimethylamine 150 g/l herbicide mixtures on weeds in immature Oil palm (Elaeis guineensis Jacq.)
Authors
Yayan Sumekar, Renaldi Alfrezzy, Intan Ratna Dewi Anjarsari
Abstract
Weed competition during the immature phase
represents a critical constraint to oil palm (Elaeis guineensis Jacq.)
productivity, with potential yield losses exceeding 50% of production capacity.
This field study evaluated the efficacy and crop safety of Isopropylamine
Glyphosate (350 g/L) and 2,4-D Dimethylamine (150 g/L) herbicide mixture at
five application rates (1.50, 2.25, 3.00, 3.75, and 4.50 L/ha) in immature oil
palm plantations in West Java, Indonesia. The trial employed a Randomized Block
Design with seven treatments, including manual weeding and untreated controls,
replicated four times. Vegetation analysis identified Strachytapheta
jamaicensis (SDR 26.60%), Miconia crenata (15.79%), and Cyperus
rotundus (11.36%) as dominant weed species. Weed biomass and phytotoxicity
assessments were conducted at 4, 8, and 12 weeks after application. Results
demonstrated that all herbicide rates achieved over 96% reduction in S.
jamaicensis biomass, with rates ≥2.25 L/ha maintaining effective long-term
suppression. Complete control of M. crenata was achieved at rates ≥2.25
L/ha, while the more recalcitrant C. rotundus required rates ≥3.75 L/ha
for total suppression. Importantly, no phytotoxic symptoms were observed on
immature oil palms at any application rate throughout the 12-week observation
period. Manual weeding demonstrated inferior performance compared to chemical
control, particularly for perennial species. The application rate of 3.75 L/ha
is recommended as optimal for achieving comprehensive weed control while
ensuring crop safety and economic efficiency in immature oil palm cultivation.
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Pages:55-60
How to cite this article:
Yayan Sumekar, Renaldi Alfrezzy, Intan Ratna Dewi Anjarsari "Efficacy of Isopropylamine glyphosate 350 g/l and 2,4-d dimethylamine 150 g/l herbicide mixtures on weeds in immature Oil palm (<i>Elaeis guineensis</i> Jacq.)". International Journal of Botany Studies, Vol 11, Issue 1, 2026, Pages 55-60
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