Application of ameliorant on peat soil has an important role on improving fertility status of peat soil via increasing soil pH, reducing organic acids and toxic ions, and also increasing nutrients availability. Soil amelioration with polyvalent cations (Fe, Al, Cu, and Zn) using slag, lateritic soils, and river mud are effective to reduce harmful effects of phenolic acids. The objective of the study was to determine the effect of soil amelioration on peat soil chemical properties and rice productivity (both biomass and yield). The study was consisted of two sets of experiments, namely soil incubation experiment conducted in the laboratory and a pot experiment conducted in the greenhouse. The experiment was designed in a complete randomized design (CRD) with 14 treatments and 4 replications. The results showed that the application of slag and dolomite as ameliorant showed a significant effect on increasing pH, base saturation (BS), and the amount of exchangeable-Ca and -Mg. Moreover, slag application was better in improving chemical properties of peat soil as it increased pH, base saturation (BS), and nutrient content (Ca, silica, ash and Fe). Application of burnt trass + dolomite (TD) showed no significant effect on increasing silica content in the peat soil. The application of slag resulted in the highest dry weight of biomass and grains of rice plants. The application of slag on peat soil in general provides better effects on the soil chemical conditions compared to that of trass, dolomite or ameliorant combination [trass + dolomite (TD) with slag].Keywords: Ameliorant, organic acids, paddy, peat soil Amelioran berperan untuk memperbaiki kesuburan tanah gambut yaitu memperbaiki lingkungan akar bagi pertumbuhan tanaman melalui peningkatan pH, menurunkan asam-asam organik dan ion-ion toksik, dan meningkatkan ketersediaan hara. Amelioran yang mengandung kation polivalen (Fe, Al, Cu, dan Zn) seperti terak baja , tanah mineral laterit atau lumpur sungai sangat efektif mengurangi dampak buruk asam fenolat. Tujuan penelitian ini adalah mempelajari: 1) pengaruh aplikasi bahan amelioran dalam memperbaiki sifat kimia tanah gambut, 2) suhu pembakaran amelioran tras dan dolomit terhadap ketersediaan silika tanah gambut, 3) pengaruh aplikasi bahan amelioran terhadap pertumbuhan dan produksi (berat kering biomas dan berat kering gabah) tanaman padi. Penelitian terdiri atas dua percobaan, yaitu inkubasi sampel tanah dilakukan dilaboratorium dan percobaan rumah kaca dengan menggunakan rancangan acak lengkap (RAL) dengan 4 ulangan. Hasil penelitian yaitu 1) aplikasi amelioran slag dan dolomit berpengaruh nyata dalam meningkatkan pH, kejenuhan basa (KB), dan kadar hara (Ca dan Mg), namun aplikasi slag lebih baik dalam memperbaiki kondisi kimia pada tanah gambut, selain meningkatkan pH, KB, kadar hara Ca, juga meningkatkan kadar silika, kadar abu dan Fe sebagai kation polivalen. 2) Pembakaran amelioran tras+dolomit (TD) tidak berpengaruh nyata dalam meningkatkan ketersedian kadar silika pada tanah gambut. 3)Aplikasi amel...
Application of different forms of silicon sources may influence rice production and quality. It is believed that properties of nanosized particles may differ significantly from those of the original bulk material. This study aimed to investigate effects of application of silica nanoparticles extracted from rice husk ash, called nanobiosilica (NBS), on the rice growth, productivity, and milling quality as compared to those of rice husk ash (RHA), sodium silicate solution (SDS), and two control treatments. NBS was produced by the sol-gel method. The five treatments were arranged on a randomized complete block design with four replicates. Application of NBS (20-50nm) and SDS significantly produced the highest stem strength, lodging tolerance, number of productive tillers, grain per-clump, and rice productivity (7.30-7.32t/ha). NBS produced better yield performances than RHA, the initial bulk material. The treatments did not influence brown rice and milled rice yield. However, the highest percentage of head rice was observed following NBS and RHA treatments. The results suggested that production of NBS from RH and its application to paddy field could be a viable strategy for supporting sustainable rice production, producing better quality of milled rice, increasing benefit of rice processors/farmers, and reducing environmental issues of underutilized rice husk.
The Ultisols has high soil acidity, Al and Fe concentration and low organic matter, nutrients, base saturation, and CEC, that limit the growth of rice and maize. The research aimed to evaluate the effectiveness of the application of fertilizers, soil ameliorant, and their combinations to improve Ultisol productivity including to increase rice and maize crops yields. This research was conducted at the Taman Bogo experimental station, Lampung Timur District, for two growing seasons (GS-1 and GS-2) in 2019. Field experiment used randomized block design with eight treatments and three replications. The treatments were included control, recommendation dosage of fertilizers (for rice: 250 kg urea ha−1, 200 kg SP-36 ha−1, 75 kg KCl ha−1; for maize: 300 kg urea ha, 175 kg SP-36 ha−1, 100 kg KCl ha−1), and combination of the recommendation dosage of fertilizers, manure, biofertilizer, and rock phosphate. Recommendation dosage of fertilizer was determined using upland soil test kit (made by Indonesian Soil Research Institute). The result showed that soil ameliorant and biofertilizer application gave significant effect to improve soil chemical physic properties and plant yields.
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