REKAYASA TANAH DASAR KOLAM INCEPTISOL MELALUI PENAMBAHAN ULTISOL DAN VERTISOL UNTUK MENINGKATKAN PERTUMBUHAN ALGA DASAR PAKAN LARVA NILA MERAH (Oreochromis sp.)
| Main Authors: | , Saberina Hasibuan, S.Pi.,MT., , Prof. dr. ir. Bambang Djadmo Kertonegoro, M.sc. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2011
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/89744/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=51691 |
Daftar Isi:
- This dissertation aims to overcome the low physical fertility of the pond bottom soil, which is made up of the sandy Inceptisols. Improving the soil physical quality can be achieved by modifying the soil texture from sandy loam to clay. This is achieved by physically mixing the Inceptisols with soils that have higher clay content, such as Ultisols and Vertisols. The mixing is proposedly meant marling. This research was carried out from August 2006 to September 2008 in a rice field at Sewon Village, Argomulyo, Cangkringan, Sleman, Yogyakarta. The objectives of this research are (1) To study the effect of mixing Ultisols and Vertisols on the productivity of the Inceptisols pond bottom soil, (2) To study the effect of basal fertilizer application on the pond bottom soil fertility and growth of benthic algae, plankton, and red tilapia larvae, (3) To find an optimal fertilization frequency by quail manure droppings on the growth of benthic algae and plankton as natural feed to red tilapia larvae, (4) To study the effect of Inceptisols Parent layer (P) compaction and the addition of quail manure fertilizer on nutrient availability during the first planting period (PP-1) and the residual effect on pond productivity in the second planting period (PP-2), and (5) To increase the red tilapia seed production. The results showed that the Inceptisols-Ultisols and Inceptisols-Vertisols mixture with clay content between 41-51% gave significant effect (P<0.05) on the chemical characteristics of the pond bottom soil, such as EC, pH, organic matter content, CEC, base saturation, Fe and K availability, C/N ratio, Ca2+, Mg2+ , K+ and Na+. It also provided a favourable pond water quality, such as water temperature, EC, and pH, O2 dissolved content, organic matter content, CO2 dissolved content, P, SiO2, total of alkalinity and hardness, content of dissolved and available Fe, ammonia (NH3), BOD, COD, total of water organic carbon, concentration of Ca, Mg, HCO3 - (bicarbonat) and CO3 2- (carbonate), concentration of nitrate and ammonium, and concentration of soluble reactive phosphate in pond water. Clay content > 40% resulted in a high contribution to the increase of pond bottom soil and water quality. The Inceptisols was dominated by plagioclase minerals (±92%) and halloysite (±8%). Halloysite content in the soil mixture (I-U) ranged from 28 to 50% and the montmorillonite content in the soil mixture I-G ranged from 28 to 57%. The high content of montmorillonite in the I-G mixture was due to the mixture with Vertisols. Therefore, pond bottom containing montmorillonite can improve the pond fertility and can be maintained until PP-2. Chlorophyll production, benthic algae and plankton abundances were also increased, which then stimulated the growth of red tilapia larvae. The total biomass, mean of length and weight at the best dose (30%:70%) for I-U and I-G without basal fertilizer were 68g and 99g