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All Journal Journal of Agroecology Agroland : Jurnal Ilmu-Ilmu Pertanian AGROLAND: The Agricultural Sciences Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) AGROTEKBIS: Jurnal Ilmu Pertanian AGROLAND: The Agricultural Sciences Journal
Danang Widjajanto
Dosen Program Studi Agroteknologi Fakultas Pertanian Universitas Tadulako, Palu
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Engineering Materials Science & Nanotechnology Physics

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ANALISIS HUBUNGAN ANTARA BEBERAPA SIFAT FISIKA TANAH PADA PENGGUNAAN LAHAN KOPI (Coffea sp.) DI DESA PEANA KECAMATAN PIPIKORO KABUPATEN SIGI Riel Handri; Danang Widjajanto; Syamsul Syukur
AGROTEKBIS : JURNAL ILMU PERTANIAN (e-journal) Vol 11 No 2 (2023): April
Publisher : Fakultas Pertanian, Universitas Tadulako

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Abstract

Tujuan penelitian adalah menganalisis hubungan antara beberapa sifat fisika tanah pada penggunaan lahan kopi di desa Peana, Kecamatan pipikoro, Kabupaten Sigi. Penelitian dilakukan pada bulan Februari – Oktober 2021. Survai tanah dilakukan berdasarkan metode purposif sampling pada penggunaan lahan kopi pada kelerengan 8% - 15 %. Pengambilan sampel tanah utuh dan tidak utuh dilakukan pada 12 titik pengamatan yang diulang sebanyak 3 kali. Analisis tanah dilakukan di laboratorium unit ilmu tanah Fakultas Pertanian Universitas Tadulako, meliputi pengamatan tekstur, bobot isi, konduktivitas hidraulik jenuh, kadar air kapasitas lapang dan karbon organik tanah. Hasil penelitian menunjukkan bahwa hubungan antara beberapa sifat fisika tanah di daerah penelitian bersifat kuadratik dengan keeratan hubungan pada tingkat sedang – sangat kuat.
LAND RESOURCE MANAGEMENT STRATEGY FOR THE SUSTAINABILITY OF THE UPPER WATERSHED OF PALU (Case Study of Miu Sub Watershed in Sigi Regency) Danang Widjajanto; Uswah Hasanah
AGROLAND The Agricultural Sciences Journal (e-Journal) Vol 6 No 1 (2019): June
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/agroland.v6i1.9

Abstract

Population growth and regional expansion has increased land needs for settlement, agriculture, and trade in the Palu watershed causing much pressure on the upper part of the watershed where Miu watershed is situated The general aim of the research was to generate strategy for sustainable land resources management in the Miu watershed as a buffer zone of the Lore-Lindu National Park. The objective of the research were 1) to predict soil erosion and sedimentation, 2) to analyze the feasibility of dominant farming systems, 3) to analyze rural development, and 4) to analyze community preference on land use priority. The erosion and sedimentation, and feasibility research was conducted through soil survey and socio-economic approach. The rural development index was determined using secondary data taken from related institution such as demography, regional structure and infra structure, and industrial-trade condition. The preferential analysis of land use priority for 10 years ahead was done using focus group discussion with farmer community leaders. The soil erosion rate was light - heavy whilst the soil erosion index was low - very high estimated by the USLE. The relationship between the river debit and suspended load at the upper and lower part of the watershed was found to follow the equation of Y= 0.001X1.366 (R2= 0.65), and Y = 0.001 X1.409 (R2 = 0.66), respectively. Three villages included Pakuli, Pandere, and Bolapapu had high index of rural development whereas low index was found in Lonca, Bangga and Tangkulowi. The high-low order of land use priority was agro forestry, cacao monoculture, fresh water fishery, wetland rice, ruminant grazing, mixed culture of rice, soy bean, cassava and maize, and poultry farming.
EFFECT OF COMPOST DOSES ON SOIL RESILIENCE IN PALU VALLEY Danang Widjajanto; Uswah Hasanah; Imam Wahyudi; St Sukmawati; Sufyan Sufyan
AGROLAND The Agricultural Sciences Journal (e-Journal) Vol 7 No 2 (2020): December
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/agroland.v7i2.623

Abstract

Applying organic matter to the soil surface is an effective effort to increase soil resilience in the Palu valley, which is classified as low. This study aimed to determine: 1) the effect of several doses of compost on the physico-chemical properties of the soil, 2) the correlation between the percentage of organic carbon and total nitrogen in the soil to several physico-chemical properties of the soil. The research was based on a randomized block design in a greenhouse of the Faculty of Agriculture, Tadulako University, Palu. Compost uses raw materials for plantain stems (Musa textilia) and leaves of Gamal (Gliricidia sepium). The compost doses used in the experiment consisted of 0%, 1%, 2%, 3%, 4%, and 5% of the weight of air-dry soil, respectively. The treatment was repeated three times. The results showed that compost application significantly affected soil content weight, total porosity, saturated hydraulic conductivity, field capacity moisture content, percentage of organic carbon, total nitrogen, and cation exchange capacity. The correlation test results showed a powerful relationship between the percentage of organic carbon or total soil nitrogen to other soil physico-chemical properties observed in the experiment.
Dynamics of Soil Organic Carbon at Different Elevations in Cocoa Land-Use Systems Danang Widjajanto; Rachmat Zainuddin; Rois; Abdul Rahman; Moh. Adnan Khaliq; Uswah Hasanah; Rosmaniar Gailea; Fera
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.11999

Abstract

Soil organic carbon (SOC) is essential for sustaining soil quality, especially in sloped agricultural landscapes prone to erosion and degradation. This study aimed to analyze SOC dynamics across different elevations (400, 600, and 800 meters above sea level) in cocoa-based land-use systems and examine its relationships with some key physical properties. Soil sampling was conducted using a stratified random design, and laboratory analyses were carried out using standard methods. The results showed that SOC increased with elevation due to cooler temperatures, slower organic matter decomposition, and higher surface litter accumulation. Polynomial regression revealed non-linear relationships between SOC and soil properties, with significant coefficients of determination: SOC vs. bulk density (R² = 0.82), SOC vs. penetration resistance (R² = 0.44), and SOC vs. saturated hydraulic conductivity (R² = 0.37). Moderate SOC levels (around 2.3% – 3.0%) were associated with improved soil structure, lower bulk density, higher hydraulic conductivity, and reduced penetration resistance. However, excessive organic inputs beyond the optimum may reduce these benefits due to incomplete decomposition. A similar curvilinear pattern was found between surface litter and SOC content. These findings highlight the importance of optimizing organic matter management in cocoa systems on sloped lands to enhance soil physical conditions and promote sustainable agriculture.
The Use of Organic Fertilizer to Enhance Soil Water Availability and Promote the Growth of Tomatoes in Sandy Loam Soils Abdul Rahman; Danang Widjajanto
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 3 (2025): June 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i3.1034-1039

Abstract

The use of organic fertilizer has been shown to improve soil structure and promote plant root growth, particularly in critical areas with limited water resources for agricultural activities. This study aimed to evaluate the effect of organic fertilizer application on the soil’s water holding capacity and the growth performance of tomato. The experiment was conducted using a randomized complete blocs design with six treatments, each replicated three times. The treatments included P0 (0 Mg/ha), P1 (5 Mg/ha), P2 (10 Mg/ha), P3 (15 Mg/ha), P4 (20 Mg/ha), and P5 (25 Mg/ha). The findings revealed that organic fertilizer application significantly influenced soil organic carbon levels, bulk density, hydraulic conductivity, and soil water availability. Additionally, the increased soil organic carbon led to noticeable improvements in shoot dry weight, total root length, and root dry weight of tomatoes. This study found that the availability of organic carbon has very strong correlation with tomatoes growth and soil water availability. Keywords: Organic Carbon, Sandy Soils Texture, Soil Structure, Water Retention.
Swallow Droppings for The Chemical Properties of Alluvial Soil As Growing Medium For Ebony (Diospyros Celebica) Abdul Rahman; Anthon Monde; Danang Widjajanto; Moh. Adnan Khaliq; Adrianton; Trisni Oktavina
Jurnal Penelitian Pendidikan IPA Vol 10 No 8 (2024): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i8.7856

Abstract

This study aimed to determine the effects of swallow bird droppings bokashi on several soil chemical properties such as pH, C-Organic, N, P, K, CEC, and to determine the appropriate dosage of bokashi fertilizer for the growth of ebony seedlings. This research was conducted at Permanent Nursery located at Tadulako University. This study was conducted using a completely randomized design with 5 treatments and 4 replications, 20 experimental units as: P0 (control), P1 (7 tons/ha), P2 (14 tons/ha), P3 (21 tons/ha), and P4 (28 tons/ha). The results showed that the swallow droppings bokashi fertilizer was able to improve: soil pH 7.18 to 7.55 with a neutral status, P from 41.34 to 65.06 with very high status, K from 46.26 to 53.87 with high status, C-Organic from 5.30 to 10.25 with high to very high status, and N-Total from 0.12 to 0.34 although in low status in the soil. The application of swallow droppings bokashi into the soil was very much needed. C-Organic content in swallow droppings bokashi was 50.23%, N (4.26). The application of swallow droppings bokashi with a treatment of 21 tons/ha (61.25 g/pot) was the best dose for the growth (height) and the increase number of leaves of ebony seedlings.
Co-Authors Abd Rahim Thaha Abdul Rahman Abdul Rahman Abdul Rahman Adrianton Adrianton Ahmad Bintoro Akbar Wirawan Anthon Monde Berkatchriseymal Berkatchriseymal Delsiyanti Delsiyanti Febrianto Febrianto Fera Fira Fermila Lawenga Hangga Parnianto Hardiyanto H. Ding Ika Nurhayati Imam Wahyudi Isrun Isrun Jumarni Jumarni Jusman Jusman Moh Akbar Moh. Adnan Khaliq Mukmin Mukmin Nuryadin Nuryadin Rachmat Zainuddin Rachmat Zainuddin Rachmat Zainuddin Riel Handri Rois Rosmaniar Gailea Rosmaniar Gailea SATRIYAS ILYAS St Sukmawati Sufyan Sufyan Supriadil Supriadil Syamsul Syukur Trisni Oktavina Trisno Trisno Ulfiyah A. Rajamuddin Uswah Hasanah