The impact of paraquat repeated application in peat soil on microbial population
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2002
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/19480/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=2311 |
Daftar Isi:
- ABSTRACT: Paraquat herbicide has been applied periodically in peat land agricultural production. This research was conducted to study the fate of paraquat in peat soil after its repeated applica¬tion, and its possible influence on the population of microorganisms that play an important role in soil fertility. Paraquat (20 ppm) was sprayed periodically to three types of peat soil, i.e.fibric, hemic and saphric. They were treated with lime to increase soil pH around 5.5. During incubation time of 6 months, paraquat residue in soil was analyzed periodically, and microbial population was measured. Ammonifier and nitrifier were measured using The Most Probable Number (MPN) method, and Phosphate solubilizer was counted using plate count method on a specific medium. During repeated application, accumulation of paraquat residue in the soil increased. The accumulation level depended on soil types, namely the level was higher in undecomposed peat soil (fibric). Microbial measurement showed that microbial tolerance to paraquat was species-specific. In this case, ammonifier was not significantly affected by the increase of paraquat concentration, and nitrifier population decreased from 103 to 102 MPN/g