Nitrogen and Potassium Exchange in an Acid Tropical Soil Incorporated with Synthetic and Natural Zeolites
Generally, soils in the tropics are highly weathered, acidic and low in fertility status. High precipitation and low soil cation exchange capacity (CEC) require large amounts of fertilization and liming to ameliorate and increase the potential of these soils. Leaching losses of NH4 + and K+ are e...
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| 主要作者: | |
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
2002
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/10588/1/FP_2002_12.pdf |
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| 總結: | Generally, soils in the tropics are highly weathered, acidic and low in fertility
status. High precipitation and low soil cation exchange capacity (CEC) require large
amounts of fertilization and liming to ameliorate and increase the potential of these soils.
Leaching losses of NH4 + and K+ are extremely large in tropical soils. Zeolites are
natural clay silicates that have high affinity and ability to adsorp NH4 + and K+. They are
able to release these ions gradually. A study was carried out in three parts. Experiment
I was conducted to determine the chemical characteristics of natural and synthetic
zeolites. The result of this study suggested that the materials used were zeolites and
therefore can be used for further experiment. Experiment II was conducted to determine
the adsorption characteristics of NH4 + and K+ by the natural and synthetic zeolites. The
result showed that treatment with synthetic Zeolite A (ZA), and natural zeolite (namely
Clinop I, from Malang, Indonesia and Clinop II from Sweetwater County, Wyoming,
USA) reduced leaching of K+ and NH4 +. The zeolites treatm'ents'increased 2-3 times
higher the CEC of the soils after 20 days of incubation. Natural zeolites treatments were better than the synthetic zeolite in retaining exchangeable cation. Experiment III was
conducted to evaluate the efficacy of NH/ and K+ retained in the soil using corn (var.
Putra 1-58) as a test crop planted for 56 days. The results showed there were significant
differences between the zeolites treatment and the control for K and N concentration in
the plant tissue. The application of K+ and NH4 + saturated zeolites increased the soil CEC
about 2-3 times higher. However, there was no significant difference in dry matter yield
and root weight. This study showed that zeolite can be used as a soil amendment to
overcome low CEC soils and leaching losses of NH4 + and K+ on highly weathered soils. |
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