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All Journal Jurnal Produksi Tanaman Journal of Honai Math Agrotechnology Research Journal Journal of the Civil Engineering Forum
Maulana, Dick Dick
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Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Education Mathematics Social Sciences

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Respon Pertumbuhan Padi Kultivar Ciherang terhadap Variasi Umur, Jumlah Bibit dan Jarak Tanam Sawah Organik Robana, Raden Rubi; Maulana, Dick Dick; Sudrajat, Irfan
Produksi Tanaman Vol. 11 No. 4 (2023): April
Publisher : Jurusan Budidaya Pertanian Fakultas Pertanian Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.protan.2023.011.04.02

Abstract

Padi merupakan salah satu komoditas pangan penting di kalangan masyarakat Indonesia dalam menunjang kebutuhan makanan pokok. Konsumsi beras di Indonesia sangat tinggi, rata-rata 130 kg/kapita/tahun. Tetapi, produktivitasnya masih rendah diakibatkan oleh berbagai kendala. Kendala utama usaha tani padi yaitu pemilihan kultur teknik yang kurang tepat untuk memunculkan pertumbuhan yang optimal. Beberapa kultur teknik yang dapat meningkatkan pertumbuhan adalah pelaksanaan umur bibit pindah tanam, pengaturan jarak tanam dan penggunaan jumlah bibit perumpun. Tujuan penelitian ini untuk mengetahui jumlah bibit perumpun, jarak tanam dan umur pindah tanam yang dapat meningkatkan pertumbuhan tanaman padi. Penelitian ini menggunakan kultivar padi yang dilepas oleh Balai Besar Penelitian Tanaman Padi (BBPADI) Subang. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 9 perlakuan dan 3 ulangan. Hasil penelitian menunjukkan perlakuan umur pindah tanam 0 HSTB Tanam Benih Langsung (TABELA) berpengaruh nyata terhadap pertumbuhan (tinggi tanaman, jumlah anakan, jumlah anakan produktif) tanaman padi. perlakuan 2 bibit per rumpun berpengaruh nyata terhadap pertumbuhan (jumlah anakan) panen tanaman padi.
Optimizing statistics education: Analyzing students' perceptions of SPSS usage Cipta, Eliva Sukma; Suryadi, Didi; Herman, Tatang; Al Jupri; Maulana, Dick Dick
Journal of Honai Math Vol. 8 No. 2 (2025): Journal of Honai Math
Publisher : Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jhm.v8i2.948

Abstract

The integration of statistical software such as SPSS in higher education represents a pivotal advancement, yet limited research has systematically examined how students perceive its pedagogical usefulness and accessibility. Prior studies seldom differentiate between the cognitive and affective dimensions influencing the efficacy of SPSS-assisted learning, leaving a gap in understanding its broader impact on student engagement and competence. Addressing this gap, the present research investigates the novelty of SPSS implementation within statistics coursework, focusing specifically on student perceptions regarding its usefulness and ease of use. Employing a descriptive mixed-methods approach, quantitative data were collected from 85 respondents through a validated and reliable questionnaire comprising 13 items, complemented by qualitative insights from in-depth interviews using open-ended prompts. The findings indicate that student perceptions are predominantly favorable for both usefulness (79.21%) and ease of use (75.18%). Qualitative analysis substantiates these results, highlighting accelerated data analysis, simplified processing, and enhanced visualization as key strengths, while noting initial challenges faced by some participants. The study underscores that optimizing the educational value of SPSS necessitates comprehensive instructional support, thereby informing future curricular improvements designed to foster numeracy and analytical proficiency in statistical learning.
The Effect of Pyrolysis Temperature on the Performance of Sewage Sludge Biochar for Persulfate-based Oxidation of Bisphenol-A Istiqomah, Nurul Alvia; Nguyen, Thi Vinh; Maulana, Dick Dick
Journal of the Civil Engineering Forum Vol. 12 No. 1 (January 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.22632

Abstract

Converting sewage sludge into biochar shows promise as an eco-friendly and cost-effective method for remediating pollutants. In this study, aerobic digested sewage sludge was evaluated as a low-cost carbon-based catalyst through a facile one-pot pyrolysis process. The sludge biochar (SBC) was then used as a persulfate (PS) activator for the degradation of Bisphenol-A (BPA). The effect of pyrolysis temperature on the physicochemical properties of SBC and catalytic activity was observed. Then, chemical quenching analysis was carried out to identify reactive species. Increasing the pyrolysis temperature from 350 to 700 °C resulted in an enhancement of the degradation rate constant of BPA from 0.95 × 10-2 min-1 to 8.9 × 10-2 min-1. SBC pyrolyzed at 350 °C (A350), characterized by a high iron content (40%wt) in the form of amorphous Fe (e.g., ferrihydrite) and C=C functional group promoting the radical formation which is dominated by presence of hydroxyl radicals. However, iron in an amorphous form limited the catalytic activity of A350. By contrast, non-radical pathway dominates SBC pyrolyzed at 700 °C (A700) with highest BPA removal as the result of more hydrophobic nature (lower O/C) therefore attracting more BPA and PS to the biochar surface. Graphitic structure of A700 (lower ID/IG) supports the mediated electron transfer pathway for persulfate activation. A pH range of 2–9 and the of inorganic anions (e.g., Cl-,NO3-,SO4-, and HCO3-) had negligible effects on the A700 system. This study introduces a novel approach to the value-added reuse of sewage sludge as an efficient persulfate activator for pollutant remediation with good resistance to water matrices conditions.
The Effect of Pyrolysis Temperature on the Performance of Sewage Sludge Biochar for Persulfate-based Oxidation of Bisphenol-A Istiqomah, Nurul Alvia; Nguyen, Thi Vinh; Maulana, Dick Dick
Journal of the Civil Engineering Forum Vol. 12 No. 1 (January 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.22632

Abstract

Converting sewage sludge into biochar shows promise as an eco-friendly and cost-effective method for remediating pollutants. In this study, aerobic digested sewage sludge was evaluated as a low-cost carbon-based catalyst through a facile one-pot pyrolysis process. The sludge biochar (SBC) was then used as a persulfate (PS) activator for the degradation of Bisphenol-A (BPA). The effect of pyrolysis temperature on the physicochemical properties of SBC and catalytic activity was observed. Then, chemical quenching analysis was carried out to identify reactive species. Increasing the pyrolysis temperature from 350 to 700 °C resulted in an enhancement of the degradation rate constant of BPA from 0.95 × 10-2 min-1 to 8.9 × 10-2 min-1. SBC pyrolyzed at 350 °C (A350), characterized by a high iron content (40%wt) in the form of amorphous Fe (e.g., ferrihydrite) and C=C functional group promoting the radical formation which is dominated by presence of hydroxyl radicals. However, iron in an amorphous form limited the catalytic activity of A350. By contrast, non-radical pathway dominates SBC pyrolyzed at 700 °C (A700) with highest BPA removal as the result of more hydrophobic nature (lower O/C) therefore attracting more BPA and PS to the biochar surface. Graphitic structure of A700 (lower ID/IG) supports the mediated electron transfer pathway for persulfate activation. A pH range of 2–9 and the of inorganic anions (e.g., Cl-,NO3-,SO4-, and HCO3-) had negligible effects on the A700 system. This study introduces a novel approach to the value-added reuse of sewage sludge as an efficient persulfate activator for pollutant remediation with good resistance to water matrices conditions.
Response of Several Shallot (Allium cepa var. ascalonicum) Varieties to Alternaria porri Danuwikarsa, M. Ibrahim; Udiarto, Bagus K.; Maulana, Dick Dick; Suaidah, Asri
Agrotechnology Research Journal Vol 7, No 2 (2023): Agrotechnology Research Jurnal
Publisher : Perkumpulan Agroteknologi/Agroekoteknologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/agrotechresj.v7i2.77300

Abstract

Shallots are a valuable commodity in Indonesian civilization. However, due to different obstacles, production remains low. The prevalence of purple blotch disease caused by Alternaria porri is one of the major challenges in shallot production. A fungus infects its host through the stomata. The use of resistant cultivars is one of the initiatives to combat purple blotch disease. This study aimed to determine the resistance of several shallot varieties to purple blotch disease, identify and obtain resistant shallot varieties, and determine the relationship between stomatal density and the average intensity of the purple blotch disease attack. This study uses shallot cultivars released by the Balai Penelitian Tanaman Sayuran (BALITSA) Lembang. This study employed a randomized completely block design (RCBD) with ten shallot varieties as the treatments with three replications. The Agrihorti-1 and Katumi varieties had the lowest attack intensity, while the Sembrani and Maja Cipanas varieties had the highest assault intensity. Bima Brebes, Trisula, Mentes, Violetta-1, Kramat-1, Agrihorti-1, Agrihorti-2, and Katumi varieties were resistant to purple blotch disease, however, Sembrani and Maja Cipanas were susceptible. A low or weakly positive association exists between stomata density and the mean intensity of purple blotch illness.
Efek Residu Biochar Sekam Padi terhadap Pertumbuhan dan Hasil Kedelai Suswana, Suli; Maulana, Dick Dick
Agrotechnology Research Journal Vol 7, No 1 (2023): Agrotechnology Research Journal
Publisher : Perkumpulan Agroteknologi/Agroekoteknologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/agrotechresj.v7i1.70894

Abstract

Biochar is a carbon-rich solid material derived from the pyrolysis of agricultural residue biomass, which takes longer to decompose than the raw material biomass. Biochar has been observed to have agronomic benefits. Because of its persistence in the soil, biochar has the potential to extend its agronomic benefits. The purpose of this study was to obtain evidence that biochar has a longer effect so that its residual effect can increase the growth and yield of soybean. A series of pot experiments which included 4 consecutive plantings were carried out. The treatments consisting of: control; rice husk biochar (RHB) 20 ton.ha-1; RHB 40 ton.ha-1; RHB 50 ton.ha-1; RHB 60 ton.ha-1; RHB 10 ton.ha-1 + chicken manure (CM) 10 ton.ha-1; RBH 20 ton.ha-1 + CM 20 ton.ha-1; RHB 30 ton.ha-1 + CM 30 ton.ha-1. The treatments were applied to the first planting of the series experiment (September-December 2018). To determine the residual effect of the treatments, the second experiment was carried out in February-June 2019 with planting aerobic rice plants, third experiment in March-June 2020 with soybeans plant, and fourth experiment in July-October 2020 with soybean plants. The results showed that the effect of residual rice husk biochar did not significantly increase growth and soybean yields in the 3rd and 4th planting.
Residual Effect of Rice Husk Biochar on Growth and Yield of Aerobic Rice Suswana, Suli; Maulana, Dick Dick
Agrotechnology Research Journal Vol 6, No 2 (2022): Agrotechnology Research Journal
Publisher : Perkumpulan Agroteknologi/Agroekoteknologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.615 KB) | DOI: 10.20961/agrotechresj.v6i2.57344

Abstract

Biochar is a carbon-rich solid material made by pyrolyzing agricultural residual biomass, and it decomposes much more slowly than the biomass from which it is made. Biochar has been shown to have agronomic benefits. Biochar can provide agronomic benefits for a longer period due to its persistence in the soil. The purpose of this research is to gather evidence demonstrating that biochar has a longer effect on increasing aerobic rice productivity. A pot experiment was carried out in UNINUS. The treatments were as follows: control, 20 Mg rice husk biochar (RHB), 40 Mg RHB, 50 Mg RHB, 60 Mg RHB, 10 Mg RHB + 10 Mg composted poultry litter (CPL).ha-1, 20 Mg RHB + 20 Mg CPL.ha-1, 30 Mg RHB + 30 Mg CPL.ha-1, and 30 Mg RHB + 30 Mg CPL.ha-1. Treatments were started in September 2018, and the effects were measured from February to June 2019. The findings revealed that rice husk biochar and its combination with CPL increased aerobic rice growth (plant height, number of tillers, and yield). The most effective combination rate is the application of biochar and composted poultry litter, 20 Mg RHB + 20 Mg CPL.ha-1, because it significantly extended the residual effect. The combined application increased rice productivity when compared to a single application of biochar and composted poultry. The residual effect of biochar and composted poultry litter on rice productivity was superior to fresh application.
Co-Authors Al Jupri Cipta, Eliva Sukma Danuwikarsa, M. Ibrahim Didi Suryadi Istiqomah, Nurul Alvia Nguyen, Thi Vinh Robana, Raden Rubi Suaidah, Asri Sudrajat, Irfan Suli Suswana Tatang Herman, Tatang Udiarto, Bagus K.