Sorption and Decomposition of Glyphosate in Soils Under four Temperature Regimes*

Suwardji, P.L. Eberbach, A.S. Black (2018) Sorption and Decomposition of Glyphosate in Soils Under four Temperature Regimes*. universitas mataram.


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Decomposition behaviour of glyphosate in 8 Australian soils was investigated under four temperature regimes using non steady state compartmental analysis (NSSCA). Temperature had a significant influence on partitioning glyphosate into the soluble and sorbed phases as well as half life of this substrate in both phases. At 5 C, only small amount of glyphosate was partitioned into soluble phase, ranged from (1.4-9.1 %) in 8 soil investigated, but as temperature increased the amount of glyphosate partitioned into soluble phase increased substantially such that at 28 C ranged from (1.4-53%). While half life of the soluble phase was in the similar order (1-2 weeks) between 8 soils investigated, half life of the sorbed phase varied widely (73-4950 days). This suggested that different strengths of binding existed within the sorbed phase in 8 soils tested. The rate of glyphosate desorbed from the sorbed phase was dependent on soil type and temperature. Glyphosate was shown to be more strongly held in the acidic soil than in alkaline soil and its sorption was correlated with the soil pH, the amount of exchangeable Fe and Al and incubation temperature. The regression equation was: Dsorp= - 0.0918 -0.0001543 pH + 0.02772 pH2 + 0.0000713 Exch (Fe + Al) -0.0918 Temp, R2 = 0.63

Item Type: Patent
Keywords (Kata Kunci): Soluble and sorbed glyphosate, decomposition and sorption behaviour of glyphosate, non steady state compartmental analysis.
Subjects: S Agriculture > S Agriculture (General)
Divisions: Fakultas Pertanian
Depositing User: Wiwin Kartikawati
Date Deposited: 29 Mar 2018 04:01
Last Modified: 29 Mar 2018 04:01

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