Nitrogen mineralization in soil amended with mesocarp fiber of oil palm and other wastes: A greenhouse study
2002
Ashara Pengnoo | Wanna Leowarin | Nisakorn Koedsub | Mana Kanjanamaneesathian (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Earth Science)
Mesocarp fiber of oil palm, sludge cake from frozen seafood factory, rick husk and organic fertilizer were mixed with a soil and incubated for 0, 15, 30, 45, 60, 75 and 90 days in plastic pots. At the end of each incubation period, NH4(+)-N and NO3(-)-N contents were determined by MgO-Devada alloy steam distillation method. N-mineralization differed depending upon incubation period and types of organic amendment. At 60 days of incubation, N-mineralization of the amended soil had increased slightly. N03(-)-N content was higher than NH4(+)-N content at all incubation periods especially in the soil amended with of the mesocarp fiber of oil palm. The soil inoculated with Sclerotium rolfsii had higher rates of N-mineralization than the soil without S. rolfsii with the exception of the soil amended with mesocarp fiber of oil palm at 5 g/kg. soil and rick husk during 60-90 days of incubation period. No3(-)-N, was the dominant product of N-mineralization in soil both added with S. rolfsii and without S. rolfsii.
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