Azwar Maas
Jurusan Ilmu Tanah, Fakultas Pertanian, Universitas Gadjah Mada, Jl. Flora, Bulaksumur, Depok, Sleman, Yogyakarta 55281, Indonesia, Telp./fax.: (0274) 563062

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THE ROLE OF IRON OXIDIZING BACTERIA TO THE QUALITY OF LEACHATE ON ACID SULPHATE SOIL Napisah, Khairatun; Maas, Azwar; Hidayah Utami, Sri Nuryani; Yusuf, Wahida Annisa
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 | Full PDF (695.571 KB) | DOI: 10.22146/ipas.34731

Abstract

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. 
ANALISIS FAKTOR PENYEBAB DAN DAMPAK PERUBAHAN PENGGUNAAN LAHAN PERTANIAN PINGGIRAN KOTA YOGYAKARTA Sudirman, Senthot; Irham, Irham; Hartono, Slamet; Maas, Azwar
Jurnal Sosial Ekonomi Pertanian Vol 4, No 1 (2010)
Publisher : Jurnal Sosial Ekonomi Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (382.46 KB)

Abstract

The problems of the study are: (a) how the peri urban agricultural land use changes, (b) what factors influence land use cahange, (c) how the impacts of the land use changes on regional food lost, food availability, and the prospects of the farming sustainability in the peri urban area ofYogyakarta city. The objectives of the study are (a) to estimate the area and the rates of the peri urban agricultural land use change, (b) to estimate the factors influencing the land use change, and (c) to estimate the impacts of the peri urban agricultural land use change to the regional food lost, regional food availability, and the prospects of the farming sustainaibility in the peri urban area of Yogyakarta city..The data collection methods used in this study are: (a) Landsat TM satellite Images analysis, (b) digitally map overlaying on computer screen using Geographic Information System (GIS), (c) documentation of secondary data, (d) interview with quetionare as the guide, and (d) field observation. Data will be analyzed by using the mathematics, statistics, and econometrics equations specially multiple linear regression. Data will be presented as the table, diagram, curve and map.The results and conclusions of this research are (a) the changed of peri urban agricultural land use as long as 11 years from 1996-2007 are 922,17 ha in Sleman; 1.888,60 in Bantul; and 1.082,79 ha involving 47 sample of villages; the rates of land use changing is in negatif correlation with the the distance from the city, (b) the used econometric model in this research indicate a satisfaction goodness of fit with R2 of 0,895. Based on the analysis of variance, F-test, and t-test can be conclude that some factors i.e. Exhange Value of Agriculture Production (FPV), Technical Irrigated Agriculture Lands (IRG), the Precentage of Built Area to the Agriculture Lands (BCPr), People Density (Dens), Society Education (Edu), and the Agriculture Land Price (FLP) significantly influence to the rates of agriculture land changes, but the other factors i.e. the Precentage of agricultural lands to the village area (FLPr), Agriculture Lands Tax (FLT), Dummy of Bantul (DB), and Dummy of Kulon Progo (DKP) do not significantly at the α of 5-10%, and (c) the rates of agricultural lands changes have negative impacts to the regional food lost, regional food availability, and the prospects of the farming sustainability of peri urban agricultural lands. The number of regional food lost equivalent with 703,443 people, and the decreasing of regional food availability is equivalent with 572.259 people.Keywords: landsat image, land use change, overlay, peri urban
EFFECT OF COMPOST COMBINATION ON METHANE EMISSION IN UNDISTURBED ACID SULPHATE SOIL IN SOUTH KALIMANTAN OF INDONESIA Annisa, Wahida; Maas, Azwar
Journal of Tropical Soils Vol 20, No 3: September 2015
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2015.v20i3.135-141

Abstract

A greenhouse experiment was conducted to examine the cumulative methane (CH4) emission in paddy soils and correlation with soil redox potential (Eh), soil pH and plant growth. The experiment was arranged in two factorial randomized block designs with three replications. The first factor was a kind of of organic matter, i.e. without organic matter (T0), combination of 50% of composted straws and 50% composted rush weed (T1), combination of 30% of composted straws and 30% composted rush weed and 40% composted cattle manure (T2) and the second factor was the management of water that was continuously flooded and leaching. The methane emission was measured in South Kalimantan using the chamber and gas chromatogram technique. The results showed methane emission in undisturbed acid sulphate soil ranged from 0.05 to 0.32 mg CH4.m-2.minute-1 during the rice-growing season. The methane emission from the paddy soil were lower when the paddy was drained than when it was flooded. Correlation analysis showed a negative relation between methane emission and soil redox potential (Eh) and soil pH in both water management. The rice plant height and number of buds has positively correlation with methane emission with coeffecient correlation of r=0.84**(P<0.0001) and r=0.64**(P=0.004), respectively.  [How to Cite: Wahida A and A Maas. 2015. Effect of Compost Combination on Methane Emission in Undisturbed Acid Sulphate soil in South Kalimantan of Indonesia. J Trop Soils 20: 135-141. Doi: 10.5400/jts.2015.20.3.135] 
PEDOGENESIS OF MT. SUMBING VOLCANIC ASH ABOVE THE ALTERATION CLAY LAYER IN THE FORMATION OF LANDSLIDE SUSCEPTIBLE SOILS IN BOMPON SUB-WATERSHED Wida, Waode Asryanti; Maas, Azwar; Sartohadi, Junun
Jurnal Ilmu Pertanian Vol 4, No 1 (2019): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (30.417 KB) | DOI: 10.22146/ipas.41893

Abstract

Numerous researches on landslides have been carried out by many researches. However, studies on soil physical properties related to landslides potential in volcanic area are still rare. The objective of this study was to examine the effect of soil physical properties on landslides potential. To collect the soil sample, sampling area method was applied. The soil type used in this study was the residual soil. The values of clay liquid limit, plasticity limit, plasticity index, water content, COLE index were used to measure the physical properties of the soil. Organic material was used as the supporting data. The results showed that the soil in the command area showed high value of clay which exceeded 50%. Such high level conditions in each profile affect the liquid limit; plasticity limit, plasticity index, water content, COLE index and organic material. Based on the results, it can be concluded that residual soils with significantly high clay values illustrated the risk of landslide fields formation in Bompon sub-watershed. The clay soil layer was the controlled factor of soil movement.
KAJIAN PEMETAAN LAHAN PERTANIAN PANGAN BERKELANJUTAN (LP2B) DI KABUPATEN PURWOREJO Sakti, Melulosa Andhytya; Sunarminto, Bambang Hendro; Maas, Azwar; Indradewa, Didik; Kertonegoro, Bambang Djadmo
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 10, No 1 (2013)
Publisher : Faculty of Agriculture, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v10i1.141

Abstract

Implementasi Undang-Undang 41 Tahun 2009 tentang lahan pertanian pangan berkelanjutan masih perlu untuk ditingkatkan. Kabupaten Purworejo memiliki luas total 103.481,75 ha yang tediri dari sawah,lahan kering dan kebun campur. Peningkatan pembangunan yang cukup tinggi menyebabkan Kabupaten Purworejo rawan terjadi alih fungsi lahan terutama lahan pertanian ke non pertanian. Penentuan lahan pertanian pangan berkelanjutan diharapkan dapat mengendalikan laju alih fungsi tersebut. Penelitian ini bertujuan untuk menentukan parameter untuk memetakan LP2B dan LCP2B, menentukan dasar perhitungan untuk menilai antar parameter LP2B dan LCP2B, menentukan kriteria pengelompokan karakteristik lahan pertanian pangan sebagai LP2B dan LCP2B dan memetakan lahan pertanian pangan berkelanjutan (LP2B) Kabupaten Purworejo. Data yang digunakan dalam penelitian ini meliputi data spasial dan data tabulasi Data spasial terdiri dari Peta Present landuse hasil interpretasi citra satelit resolusi tinggi kabupaten purworejo skala 1:25.000, peta topografi, peta kesesuaian lahan, peta batas administrasi kecamatan, dan peta lahan baku sawah. Data tabulasi terdiri dari kebutuhan dan ketersediaan pangan, neraca bahan pangan, alih fungsi lahan sawah, laju pertumbuhan penduduk, dan kebutuhan luas lahan. Hasil penelitian diketahui bahwa jumlah penduduk, produksi lahan sawah, luas tanam, luas panen, laju alih fungsi dan neraca bahan makanan dapat digunakan sebagai parameter untuk menentukan LP2B sedangkan kriteria pengelompokan lahan didasarkan pada sistem irigasi dan produkstivitas lebih dari 5,5 ton/ha dengan IP lebih dari 1,75. Berdasarkan hasil analisis kabupaten Purworejo memiliki total luas kawasan pertanian pangan seluas 38.562 ha yang terdiri dari 27.850,18 ha lahan basah dan 10.712 ha lahan kering. Dari luas tersebut yang menjadi LP2B basah seluas 25.826 ha dan LP2B kering 5.243 ha. Lahan cadangan pertanian pangan berkelanjutan basah (LCP2B basah) 2.024 ha dan cadangan pertanian pangan berkelanjutan kering (LCP2B kering) 5.469 ha.
EFEKTIVITAS AMELIORAN PADA LAHAN GAMBUT TERDEGRADASI UNTUK MENINGKATKAN PERTUMBUHAN DAN SERAPAN NPK TANAMAN JAGUNG MANIS (ZEA MAYS L. VAR. SACCHARATA) Maftu?ah, Eni; Maas, Azwar; Syukur, Abdul; Purwanto, Benito Heru
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 41 No. 1 (2013): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.732 KB) | DOI: 10.24831/jai.v41i1.7071

Abstract

This study was aimed to determine the effectiveness of several of ameliorant formulas to increase plant growthand NPK uptake on sweet corn (Zea mays L. var. saccharata) on degraded peatlands. The research was conducted in thegreenhouse of Balittra during May to July 2011. Sweet corn was planted in pot with soil taken from previously burnt peatin Kalampangan, Palangkaraya. The treatment consisted of two factors, i.e., combination of ameliorant (A1=80% chicken manure + 20% dolomite, A2=80% agricultural weeds + 20% dolomite, A3=80% mineral soil (Spodosol) + 20% dolomite,A4=20% chicken manure + 20% agricultural weeds + 20% Eleocharis dulcis + 20% mineral soil + 20% dolomite, andA5=19% chicken manure + 71.5% mineral soil + 9.5% dolomite) and application rates at 5, 10, 15, 20 and 25 ton ha-1, arranged in a randomized complete block design, with 3 replications. The results showed that ameliorants and application rates affected growth and NPK uptake of sweet corn. Application of 20 ton ameliorant (80% chicken manure + 20% dolomite) ha-1 produced the highest dry weight of root and shoot, and NPK uptake.Keywords: ameliorants, degraded peatland, nitrogen, phosphate, potassium
Restorasi Gambut dengan Tiga Jenis Surfaktan, dan Pengaruhnya terhadap Efisiensi Penyimpanan Kation dan Kapasitas Memegang Hidayah Utami, Sri Nuryani; Maas, Azwar; Radjagukguk, Bostang; Purwanto, Benito Heru
Agritech Vol 29, No 1 (2009)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.849 KB) | DOI: 10.22146/agritech.9759

Abstract

The experimental study on hydrophobic and hydrophilic peat restoration from Central Kalimantan executed in labo­ ratory using Completely Randomize Design Factorial consist of two factors. The first factor was peat type that is hydrophobic and hydrophilic peat, and the second factor is type of surfactants, those are anionic, ionic and detergent condensation. The study aims at improving the nature of irreversible drying of  hydrophobic peat Kalimantan to be­ come productive again denoted by the depository efficiency fertilizer and water holding capacity. Results of research show the surfactants improve the depository efficiency of cation K+ and Mg2+ and can maintain soil moisture content of dry peat from 20 % becoming 150 %.ABSTRAKPercobaan restorasi gambut hidrofobik dan hidrofilik  dari Kalimantan Tengah dilaksanakan di laboratorium de­ ngan Rancangan Acak Lengkap Faktorial terdiri atas 2 faktor. Faktor I adalah jenis gambut yaitu gambut hidrofobik dan hidrofilik dan faktor kedua adalah jenis surfaktan yaitu anionik, inonik dan larutan deterjen. Tujuan penelitian adalah untuk memperbaiki sifat kering tidak balik (hidrofob) gambut agar dapat produktif lagi yang ditunjukkan de­ ngan efisiensi penyimpanan pupuk (kation) dan kapasitas memegang air (water holding capacity). Hasil penelitian menunjukkan surfaktan meningkatkan efisiensi penyimpanan kation K+ dan Mg2+ dan dapat mengembalikan kelengas­ an gambut yang kering dari 20 % menjadi 150 %.
ANALISIS KINERJA KARYAWAN DIVISI MILL DAN BOILER PT GULA PUTIH MATARAM Sudibyo, Sudibyo; Hartono, Slamet; Maas, Azwar
Agro Ekonomi Vol 25, No 2 (2014): DESEMBER 2014
Publisher : Department of Agricultural Socio-Economics Faculty of Agriculture Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2624.938 KB) | DOI: 10.22146/agroekonomi.17278

Abstract

The objectives of this study are to analyze the understanding of employee of Mill and Boiler Division, PT Gula Putih Mataram to employee performance factors and their impact on employee performance. Fifty two employees of Mill and Boiler Division are drawn purposively as the respondents. The data of employee understanding on job description, SOP, employee relation, KPI, technical aspect, and employee performance were collected from the respondent through interview using prepared questionnaire. Data of employee performance was collected from the office of PT GPM. The result of data analysis shows that the performance of chief, officer, and supervisor in Mill and Boiler Division is good at rate of 70-80 percent. Factors affecting employee performance are understandings of employee on job description and SOP and employee relation. The study suggests to improve understanding of employee on job description and SOP and employee relation.
WATER USE EFFICIENCY IN VERTICAL CROPPING SYSTEM WITH VOLCANIC ASH MEDIA BY USING BIOCHAR AND URBAN WASTE COMPOST FERTILIZER AS SOIL AMENDEMENT Nitisapto, Mulyono; Maas, Azwar; Purwanto, Benito Heru; Sudira, Putu
Jurnal Ilmu Pertanian Vol 4, No 1 (2019): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1789.457 KB) | DOI: 10.22146/ipas.34304

Abstract

Applying volcanic ash as planting media has to cope with several constrains: it quickly became sediment and hardened when exposed to water. One of the efforts to improve its physical condition is by utilizing biochar, which is one of amendment materials that can improve the soil quality. This study used vertical column container made from PVC to enable vertical plant arrangement. Volcanic ash requires additional nutrient intake from organic fertilizer such as urban waste compost. The objective of this study was to identify the proper dose combination of volcanic ash, biochar, urban waste compost fertilizer and column population per m2 to sustain the growth of curly lettuce in vertical cropping system, as well as the water use efficiency. This study was designed by using the Completely Randomized Design (CRD) Factorial with three factors. The first, second and third factors consisted of Biochar M1, M2 and M3 (25; 33; and 50 %), compost fertilizer doses of K1, K2, and K3 (25; 33; and 50 %), and column density of P1, P2 and P3 (4 columns/m2, 3 columns/m2 and 2 columns/m2), respectively. The total combination was 3 x 3 x 3 and each was repeated 3 times. Resulted data of this study consisted of growth and crops and analyzed by using the Analysis of Variance and continued with the HSD Tukey 5% Test (Honest significant deference). The water use efficiency (g/kg) can be formulated as the production of dry material per total water during the cultivation season (g/kg). Results of this study showed the highest fresh consumption result was obtained from treatment M3K3 in 556 g/column (comparison of volcanic ash, charcoal husk and compost = 25 : 25 : 50 %) and the best water-use efficiency was 2.30 g/kg.
SIFAT FISIK, KIMIA DAN FTIR SPEKTROFOTOMETRI GAMBUT HIDROFOBIK KALIMANTAN TENGAH Utami, Sri Nuryani Hidayah; Maas, Azwar; Radjagukguk, Bostang; Purwanto, Benito Heru
Journal of Tropical Soils Vol 14, No 2: May 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i2.%p

Abstract

Nature on Soil Phisical, Chemical and Ftir Spectrophotometry of Hydrophobic Peat From Central Kalimantan (S.N.H. Utami, A. Maas, B. Radjagukguk, and B.H. Purwanto): Peat soils naturally have hydrophilic or water-loving character with highly capable of exchanging the cations and cycling the nutrients from the vegetations. This water-loving character is altered to water-repellent character in hydrophobic peat soils. This research was aimed to observe deeply the functional bunch carrier of hydrophobic and hydrophilic peat soils as shown by FTIR spectra in relation with inherent chemical and physical properties of the soils. Five peat soils consisted of two native and artificial hydrophobic peat soils and one sample of hydrophilic peat soils were studied. Artificial hydrophobic peat soils were yielded by oven-drying the native hydrophobic peat soils at 50 oC for 10 hours. FTIR spectra can distinguish the functional bunch carrier of hydrophobic and hydrophilic peat soils. FTIR spectra of hydrophobic peat soils showed degradation of hydrophilic bunch carrier (¾OH and ¾COOH) and increase of the hydrophobic bunch carrier (tying aromatic from esther and ether). Chemical analysis  of the hydrophobic peat soils also indicated the decrease of ¾OH and ¾COOH content, decrease of CEC , soil total acidity and soil moisture content.