Salam, Abdul Kadir (1997) Changes in Availability of Heavy-Metal Micronutrients in Soils Treated with P-Fertilizers. Pros Sem Nasional Identifikasi Masalah Pupuk Nasional dan Standardisasi Mutu yang Efektif. pp. 178-183. ISSN 979-95600-0-4
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Abstract
Availabilities of heavy-metal micronutrients in soils are suggested to be reduced by phosphate fertilization. This research was to evaluate the effect of some agricultural P-fertilizers and a pure phosphate chemical on availabilities of heavy metals micronutrients in Ultisol from Central Lampung Indonesia. Evaluation was conducted with two different experiments. In the first experiment, soil was field-treated with different sources of P-fertilizers (TSP, SP-36, and rock phosphate) at rates ranging from 0 to 250 kg ha-1 for TSP and SP-36 and from 0 to 500 kg ha-1 for rock phosphate and was sampled after a 4 week planting with soybean. Soil pH, available P, and available metal micronutrients were then determined. In the second experiment, soil sample from an untreated field adjacent to the treatment plots of the first experiment was treated withKH2PO4 at rates ranging from 0 to 800 kg P ha-1 and/or lime at rates equivalent to 0-6 ton CaCO3 ha-1 in a laboratory experiment. The available Cu and Mn were negatively correlated with P-fertilizer addition, that tended also to increase the soil pH. The lime addition consistently decreased the soil available metal micronutrients. However, the laboratory experiment showed that the available metal micronutrients were not reduced by KH2PO4 treatments. These observations suggest that P-fertilizers reduce the availabilities of metal micronutrients due to the liming effect on soil by increasing soil pH, not to their phosphate component’s reaction with soil solid surfaces.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Heavy-Metals, Lime, Micronutrients, P-Fertilizers, Phosphorus |
| Subjects: | S Agriculture > S Agriculture (General) |
| Divisions: | Fakultas Pertanian (FP) > Prodi Ilmu Tanah |
| Depositing User: | Abdul Kadir Salam |
| Date Deposited: | 26 Apr 2018 03:57 |
| Last Modified: | 26 Apr 2018 03:57 |
| URI: | http://repository.lppm.unila.ac.id/id/eprint/6396 |
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