Supiandi Sabiham
Departemen Ilmu Tanah Dan Sumberdaya Lahan, Fakultas Pertanian, Institut Pertanian Bogor, Jalan Meranti, Kampus IPB Darmaga, Bogor 16680

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Journal : AGRIVITA, Journal of Agricultural Science

Decomposition of Oil Palm Frond and Leaflet Residues Heru Bagus Pulunggono; Syaiful Anwar; Budi Mulyanto; Supiandi Sabiham
AGRIVITA, Journal of Agricultural Science Vol 41, No 3 (2019)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v41i3.2062

Abstract

Frond and leaflet residues from pruning of oil palm which are applied as mulch on oil palm plantation will decompose and can be source of organic matter and some essential nutrients. Information about how much the released nutrients from the decomposition processes of frond and leaflet of oil palm is limited. The objective of this research was to study the period (two years) patterns of nutrient release and decomposition of frond and leaflet of oil palm at different burial depth (0 to 30 cm) in peat soil. Decomposition of frond and leaflet of oil palm did not have a different pattern in mass loss, chemical content changes of C/N, N content, P content, P released, however, it has different pattern in N released. During two years of decomposition, frond and leaflet lost 88% and 86% of its initial weight and released 51% and 83% of N, also it released P 87% and 93% respectively. Frond and leaflet from pruning of oil palm should be returned to plantation area for one source of nutrients beside fertilizer.
Harvesting of Residual Soil Phosphorus on Intensive Shallot Farming in Brebes, Indonesia Muliana Muliana; Arief Hartono; Syaiful Anwar; Anas Dinurohman Susila; Supiandi Sabiham
AGRIVITA, Journal of Agricultural Science Vol 40, No 3 (2018): OCTOBER
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v40i3.1868

Abstract

Accumulated residual soil phosphorus (P) on shallots farming in Brebes can be harvested through the application of ameliorants or bio-fertilizers. The information on the effect of ameliorants and bio-fertilizers on soil P fractions is limited. The study objective was to evaluate the transformation of accumulated P to available forms by adding humic substance (CHS), bio-fertilizers (CBF), phosphate solubilizing bacteria (PSB), or phosphate solubilizing fungi (PSF) on soil from Brebes. The experiment was conducted in rhizobox that has two compartments, namely inner compartment (rooting area) and outside compartment (non-rooting area). Shallots were planted for 26 days, observed for their growth, and analyzed for their P absorption. Soil samples in rooting and non-rooting area were analyzed for their P fractions after planting. The results indicated that the addition of CHS, CBF, PSB or PSF increased the harvesting of residual soil P through its transformation to a more labile P as high as 0.67% in rooting area. The dynamic of transformation in rooting area gave better information of harvesting P. The capability of harvesting accumulated P was in the order of CBF, CHS, PSF and PSB. For harvesting residual P, addition of humic substance or bio-fertilizers should be made in the rooting area.