Effects of liming and fertilisation on the microbial decomposition of tropical peat
Two methods were used to study the effects of liming and NPK-fertilisation on the microbial decomposition of tropical peat:(1) measurement of the decomposition by aerobic incubation and kinetics analysis and (2) measurement of CO2 flux from peat soil surface by gas-liquid chromatography. Maize (Masm...
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| Hauptverfasser: | , , |
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| Format: | Proceedings Paper |
| Sprache: | English |
| Veröffentlicht: |
The Malaysian Society of Soil Science
2014
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| Schlagworte: | |
| Online Zugang: | http://agris.upm.edu.my:8080/dspace/handle/0/7789 |
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| Zusammenfassung: | Two methods were used to study the effects of liming and NPK-fertilisation on the microbial decomposition of tropical peat:(1) measurement of the decomposition by aerobic incubation and kinetics analysis and (2) measurement of CO2 flux from peat soil surface by gas-liquid chromatography. Maize (Masmadu) was the test crop grown for field trials.Maize could not grow without liming with GML (ground magnesium limestone) even though NPK fertilized as the roots do not grow into the acidic subsurface layer.There was a good correlation between the root weight and top growth or grain yields.Effects of liming on decomposition of peat were substantial:the higher the soil pH, the larger the decomposition rate.Decomposition rate constants (k) for the first-order kinetics model (Y=Y exp (-kt)) of NPK plots of LO () ton GML/ha), L1(12.5), L2(25),L3(50) were 0.54, 0.83,3.10 and 3.88x10-4, respectively, indicating the decomposition was stimulated by GML application.There were no substantial differences among NPK treatments.The enhancement of microbial decomposition by liming was also ascertained by the measurement of CO2 emission from soil surface of the field.Co2 flux ranged from 11.0 to 30.3 mmole.m-2h-1, showing that a higher soil pH gave greater flux.A mathematical model was developed to stimulate annual surface subsidence of arable peat land by measuring of CO2 flux from soil surface. |
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