Peranan Keragaman Mineralogi Lempung dalam Strategi Pernupukan P pada Tanah-Tanah Mineral Masam
| 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/24032/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=7002 |
Daftar Isi:
- Acid mineral soils play an important role in agricultural extension in Indonesia. Major distribution of these soils are in Sumatra, Kalimantan, Sulawesi and West Papua. These soils were viewed as a marginal soil since the productivity level is low due to severely deficient in P and micronutrients. The high fixation of P presumably related to high contents of Fe and AI oxides. Soil samples were taken for every 20 cm from surface to give a total of 30 samples e.g. 14 samples from Lampung, 10 samples from West Java, and 6 samples from Central Java. The samples. Soil kaolin was concentrated from the clay fraction by removal of iron oxides in buffered dithionite-citrate-bicarbonate solution. Iron oxides were concentrated by dissolving kaolin with strong alkali solution. Measurements of P sorption by soil, kaolin and iron oxides were conducted by equilibrating 200 mg of air dry soil (