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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Journal of Tropical Soils Jurnal Sosial Ekonomi Pertanian Asian Journal of Agriculture
Azwar Maas
Jurusan Ilmu Tanah, Fakultas Pertanian, Universitas Gadjah Mada, Jl. Flora, Bulaksumur, Depok, Sleman, Yogyakarta 55281, Indonesia, Telp./fax.: (0274) 563062
Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance Environmental Science Social Sciences

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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
Short Communication: Volcanic ash utilization as planting medium of curly lettuce with charcoal husk and urban waste compost as soil amendment MULYONO, NITISAPTO; MAAS, AZWAR; PURWANTO, BENITO HERU; SUDIRA, PUTU
Asian Journal of Agriculture Vol 2 No 02 (2018)
Publisher : Society for Indonesian Biodiversity & Universitas Mulawarman, Samarinda, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/asianjagric/g020201

Abstract

Mulyono, Maas A, Purwanto BH, Sudira P. 2018. Short Communication: Volcanic ash utilization as planting medium of curly lettuce with charcoal husk and urban waste compost as soil amendment. Asian J Agric 2: 39-43. During a volcanic eruption, volcanic ash spreads over an extensive area, causes environmental disturbances, and thus, should be disposed afar from settlements. On the other hand, volcanic ash is useful in urban areas where pot-planting is often lack soil medium. However, the utilization of volcanic ash as direct planting medium has many obstacles due to its characteristics such as the acidic, nitrogen nutrients rareness, compressed and dull to water. Hence, to be ready to use, it should be improved by using soil amendment. This study used charcoal husk combined with compost as the soil amendment. The purpose of this study was to use the volcanic ash as the planting medium, by obtaining a proper dose of volcanic ash and the soil amendments for the growth and yield of curly lettuce. The experimental design applied in this study was the complete randomized design (CRD) with three replications. The first factor was the 5 levels of charcoal husk (on volcanic ash) doses, namely 0.30; 0.40; 0.50; 0.60; and 0.70. The second was the ratio between the media and the 3 levels of urban waste compost doses, namely: 3:1; 2:1 and 1:1, resulting in 5 x 3 total combinations with three replications. The plant growth and yield data results were analyzed by using the variance analysis and continued with Duncan Multiple tests (Duncan Multiple Range Test). The results showed that when used as the sole planting medium, the volcanic ash could not support the growth of lettuce plants. The evidence was shown from the same size and weight of the curly lettuce after the age of 35 days (5 g/plant). The utilization of husk and urban waste compost treatment showed significant growth rise. The combination of volcanic ash and soil amendments showed that the best effect on the growth and yield of curly lettuce was from M3K3 treatment at the dose of 25% volcanic ash, 25% charcoal husk and 50% urban waste compost (60 g/plant).
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] 
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.v14i2.159-166

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.
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
Co-Authors Abdul Syukur Benito Heru Purwanto Bostang Radjagukguk Irham, Irham Maftu’ah, Eni MULYONO, NITISAPTO Putu Sudira Senthot Sudirman Slamet Hartono Sri Nuryani Hidayah Utami Wahida Annisa