Aini, Septi Nurul and astriana rahmi Setiawati, astriana Rahmi Setiawati and Dedy Prasetyo, Dedy Prasetyo (2023) The Behavior of Phosphorus Adsorption on Soil in the Geological Formation of Ranau Tuff Using the Langmuir Isothermic Model to Support Food Security. -. (Unpublished)
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Abstract
In tropical soils, phosphorus (P) adsorption is one of the main processes that control the availability of P for plant growth. Soils that develop from volcanic material have a high P uptake as the mineral composition contains a lot of active colloids of Fe and Al which play a crucial role to adsorb P in soil complex. Soils which have a high capacity of P adsorption, potentially decrease the efficiency of P fertilizers into the soil as it is unavailable for plant growth. Langmuir Isothermic Model is a mathematical model that can be used to determine the capacity adsorption (Xmax) and the relative energy (K L) of phosphorus in the soil. This study was therefore aimed to obtain the information on the maximum phosphorus absorption capacity in the soil samples of Tufa Ranau Geological Formation (TRGF). The basic information from this research provided the valuable information of P nutrients management in the soil to support the efficiency of P fertilizer and food security. Soil samples were collected from TRGF area at three zones in West Lampung Regency (1. ± 40 km; 2. ± 30 km; and 3. ± 20 km in the southern area of Lake Ranau). Soil samples were collected from two deph of soils (0 – 20 cm and 20 – 40 cm). This research was an experimental study that has been conducted in the Laboratory of Soil Science, Faculty of Agriculture, University of Lampung to analysis the behavior of P adsorption with Langmuir Isothermic Model. Then the Student-t test was performed to see the difference between the maximum absorption of phosphorus and the relative energy of phosphorus adsorption in each treatment. The results showed that soil in Balik Bukit has a maximum adsorption P value (Xmax) which is higher than that of the soil in Sekincau and Batu Brak on TRGF. The high value of X max is because Balik Bukit may have to do with a high Fe content of 35.95 mg kg-1, since Fe is one of the causes of high P sorption in the soil. The relative energy of phosphorus adsorption value (K L) in subsurface horizons is relatively higher than that of in surface horizon so that P in subsurface horizons is relatively difficult to be available when compared to surface horizons, because the higher K L value makes P more difficult to be available to plants.
| Item Type: | Other |
|---|---|
| Subjects: | S Agriculture > S Agriculture (General) |
| Divisions: | Fakultas Pertanian (FP) > Prodi Ilmu Tanah |
| Depositing User: | Septi Septi Aini |
| Date Deposited: | 10 Apr 2023 00:56 |
| Last Modified: | 10 Apr 2023 00:56 |
| URI: | http://repository.lppm.unila.ac.id/id/eprint/49938 |
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