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The role of iron oxidizing bacteria to the quality of leachate on acid sulphate soil Khairatun Napisah; Azwar Maas; Sri Nuryani Hidayah Utami; Wahida Annisa Yusuf
Jurnal Ilmu Pertanian Vol 5, No 1 (2020): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

The problem encountered in acid sulphate soil is the presence of pyrite (FeS2) which causes soil to have highly acid reaction when the pyrite is oxidized. The decline in quality not only occurs on the soil but also on the quality of the surrounding waters. One way to improve the quality of the leachate is by draining it through biofilter plants in the form of purun tikus (Eleocharis dulcis) and bulu babi (Eleocharis retroflaxa) which can absorb or neutralize these elements. The purpose of this research was to know the inoculant influence of iron oxidizing bacteria to leachate quality in acid sulphate soil. The research was conducted on a pot scale in greenhouse. The research was in randomized block design (RBD) of 3-factors with 3 replications. The first factor was inoculants, the second factor was water management, and the third one was phytoremediation material (Eleocharis dulcis and Eleocharis retroflaxa). The results showed that the plant height in the inoculant treatment+wood charcoal was in the range of 89.33−95.33 cm, while that in the inoculant treatment+husk charcoal was in the range of 89.50−93.00 cm. Meanwhile, the yield of rice with bacteria oxidizing iron inoculant+wood charcoal was higher, which was at 6.77 ton.ha-1 than inoculant treatment of oxidizing iron+husk charcoal which was only 5.95 ton.ha-1.

Relationship between soil morphology and variability of upland degradation in Bogowonto Watershed, Central Java, Indonesia Krishna Aji; Azwar Maas; Makruf Nurudin
Journal of Degraded and Mining Lands Management Vol 7, No 3 (2020)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2020.073.2209

Land-use change and lack of conservation in Bogowonto Watershed area have caused land degradation due to erosion and landslides. The rate of land degradation can be measured through the morphological characteristics of the soil and landscape. This study aimed to identify the relationship between the morphological characteristics of the soil and the rate of land degradation in Bogowonto Watershed area. The research framework initiated from the interpretation of thematic maps, surveys and field observations, and verification using land degradation assessment software. Sample points were determined using a stratified random sampling method. In general, land degradation is affected by slope, limited soil development, suboptimal conservation measures, and land-use change. Particularly, land degradation is affected by the type of landscape and the morphological characteristics of the soil. Volcanic hilly landscapes show a degradation rate of fine to very fine, characterized by thick soil depth (>60 cm), generous root distribution, loamy textured soil, fine soil particle size (Ø <0.002 mm), and good soil structure. The distribution of easily weathered volcanic ash causes volcanic hills to have thick and fertile soil characteristics. Quaternary-tertiary volcanic transition landscapes show a degradation rate of damaged to heavily damaged, characterized by thin soil depth (<60 cm), limited rooting, dominant coarse fraction (Ø 2–0.05 mm), and contact with fields lithological discontinuity. The data obtained provide information on the morphological characteristics of the soil and land degradation in Bogowonto Watershed area. The results of the study can also be used as a formulation for the conservation of Bogowonto Watershed area.

The role of iron oxidizing bacteria to the quality of leachate on acid sulphate soil Khairatun Napisah; Azwar Maas; Sri Nuryani Hidayah Utami; Wahida Annisa Yusuf
Jurnal Ilmu Pertanian Vol 5, No 1 (2020): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.34731

The problem encountered in acid sulphate soil is the presence of pyrite (FeS2) which causes soil to have highly acid reaction when the pyrite is oxidized. The decline in quality not only occurs on the soil but also on the quality of the surrounding waters. One way to improve the quality of the leachate is by draining it through biofilter plants in the form of purun tikus (Eleocharis dulcis) and bulu babi (Eleocharis retroflaxa) which can absorb or neutralize these elements. The purpose of this research was to know the inoculant influence of iron oxidizing bacteria to leachate quality in acid sulphate soil. The research was conducted on a pot scale in greenhouse. The research was in randomized block design (RBD) of 3-factors with 3 replications. The first factor was inoculants, the second factor was water management, and the third one was phytoremediation material (Eleocharis dulcis and Eleocharis retroflaxa). The results showed that the plant height in the inoculant treatment+wood charcoal was in the range of 89.33−95.33 cm, while that in the inoculant treatment+husk charcoal was in the range of 89.50−93.00 cm. Meanwhile, the yield of rice with bacteria oxidizing iron inoculant+wood charcoal was higher, which was at 6.77 ton.ha-1 than inoculant treatment of oxidizing iron+husk charcoal which was only 5.95 ton.ha-1.

Effects of rice husk biochar and raised bed on CO2 flux and shallot (Allium cepa L.) production on peatland Eka Widiawati Wijaya Kusuma; Azwar Maas; Sri Nuryani Hidayah Utami; Eni Maftuah
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 18, No 2 (2021): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v18i2.47974

This study aims to assess the effect of rice husk biochar, raised beds, and chicken manure on the CO2 flux and shallot production on peatland. This study adopted a factorial randomized block design with three factors and three replications. The P1 treatment was recommended by the Swamp Land Agricultural Research Institute by adding chicken manure (5 ton ha−1) and rice husk biochar (5 ton ha−1) while the P2 treatment was recommended by the Vegetable Research Institute by adding chicken manure (10 ton ha−1). The raised beds heights were 20 cm (A) and 30 cm (B). Variance analyses were applied to each observation variable and followed by Duncan's Multiple Range Test at a 5% level. The P1A treatment was the best in improving the shallot production up to 10.88 tons and producing the lowest CO2 cumulative flux up to 0.158 ton ha-1 season-1.

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