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Effect of Slope and Distance from Oil Palm Stands on Soil Water Content Siringoringo, Naomi Yulia; Gusmara, Herry; Prawito, Priyono; Prasetyo, Prasetyo; Utami, Kartika
TERRA : Journal of Land Restoration Vol. 6 No. 1 (2023)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/terra.6.1.40-45

This study aims to study the effect of land slope and distance from the main crops on soil water content at the end of the rainy season. The research location is located at position 3°41'51.8"S - 102°18'58.0"East in Talang Tengah I Village, Pondok Kubang District, Central Bengkulu. The research was conducted in February - April 2021. Soil analysis was done at the Soil Laboratory, University of Bengkulu. The study used a completely randomized block design with two factors. The first factor is the slope of 0-3% and 30%. The second factor is the distance of the cutting slope from the main oil palm tree, namely 1.5; 2.0; 2.5; 3.0; 3.5; and 4.0 m. Data were analyzed using ANAVA and LSD at 5% level. The results showed that the slope of the land and the distance between the slopes had a significant effect on the soil water content. The soil water content in both gravimetric and volumetric methods on slopes of 0-3% is higher than on slopes > 30%. The water content at a distance of 1.5 to 3 m from the tree of oil palm is lower than at a distance of 3.5 – 4.0 m.

Groundwater Retention Based on Toposequence in People’s Oil Palm Plantations Utami, Wanda Afrilia; Hermawan, Bandi; Prawito, Priyono; Barchia, Muhammad Faiz; Sukisno; Putri, Elsa Lolita
TERRA : Journal of Land Restoration Vol. 7 No. 2 (2024)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/terra.7.2.110-115

Soil, water, and crops are interdependent components of agricultural systems, and understanding their characteristics and interactions is critical for effective agricultural management. This study investigates the relationship between soil water-holding capacity and varying land slope gradients. The research was conducted on a community oil palm plantation in Talang Tengah I Village, Pondok Kubang District, Central Bengkulu Regency. A purposive sampling method was applied at five slope categories: flat (0–8%), sloping (8–15%), moderately steep (15–25%), steep (25–45%), and very steep (45–100%). Data analysis was performed using Partial Least Squares Structural Equation Modeling (PLS-SEM) with WarpPLS 7.0 software. The findings demonstrate a significant influence of slope on soil water-holding capacity. Increasing slope gradients are associated with reduced soil permeability, increased bulk density, decreased total pore space, and lower soil organic carbon content, collectively leading to diminished water-holding capacity. The developed model accurately represents the relationships between variables, indicating that slope directly affects organic matter, sand content, and permeability, while bulk density impacts total pore space and permeability, which in turn influence water-holding capacity. The results emphasize the importance of considering land slope in soil and water management strategies to optimize agricultural productivity. Future applications of this model could guide sustainable land-use planning and inform erosion control measures to maintain soil quality and water availability in sloped agricultural landscapes

Organic Fertilizer Application on Three Varieties of Irrigated Low-land Rice (Oryza sativa L.) Suhadi , Asman; Widodo, Widodo; Sumardi, Sumardi; Prawito, Priyono; Barchia, Faiz
Akta Agrosia Vol 27 No 2 (2024)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP), Fakultas Pertanian, Universitas Bengkkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/aa.27.2.103-110

ABSTRACT Rice is the main staple in Indonesia and the demand for rice production risees along with population growth. Providing organic fertilizer can overcome fluctuations in rice production by increasing nutrient efficiency and being nutrients availability that contribute crop yield increase. This research was carried out in Kaur Regency, Bengkulu Province in September – December 2023. The objective of this research was to เว็บสล็อต | R4shub investigate the effect of manure on growth and yield of three varieties of irrigated lowland rice. The first experiment was using a Completely Randomized Block Design (CRBD) with 2 factors. The first factor is 3 types of rice varieties, namely Inpari 48, Inpari 32 and Inpari 38. Meanwhile, the second factor is the type of manure, namely cow manure, goat manure and chicken manure. The results of the research showed that in the first experiment it was concluded that there was no real interaction between rice varieties and manure on rice growth and yield. The best rice variety is Inpari 48 which has better growth and yield compared to Inpari 32 and Inpari 38. The application of chicken manure produces big77 better growth and yield of rice and soil chemical properties and agronomic efficiency compared to cow and goat manure. Keywords: efficiency, organic fertilizer, rice varieties

Climate Change: A Study of Air Temperature Trend and Variation in the City of Bengkulu Nita, Linda Tria; Prawito, Priyono; Sudjatmiko, Sigit; Anwar , Anang
AGRITROPICA : Journal of Agricultural Sciences Vol. 7 No. 1 (2024)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agritropica.7.1.1-9

Climate change is noticeable but the impact and the change are not easily detected. The most pronounced and easily detected climate change is air temperature changes, which affect both the state of natural ecosystems and human social life. Increasing climate and weather variability and extreme climate events affect human life and natural systems more detrimental than the effect of climate change in the form of climate means. This study aims to determine the change in air temperature and the presence of extreme air temperature during the last 37 years. Data of average air temperature (AAT), maximum air temperature (MAT), and minimum air temperature (MiAT) from 1985 to 2022 from the P. Baai Station and Fatmawati Station were used. Trendline analysis were performed to find an increasing trend of air temperature, while the frequency distribution analysis was performed to find extreme climate even. The study concluded that AAT in the City of Bengkulu increase about 0.026oC yr-1 , the MAT increase about 0.005oC yr-1, and the MiAT increase 0.025oC yr-1 during the last 37 years. The extreme climate event however, neither low nor high air temperature was detected. The AAT, MAT and MiAT at present are 26.4oC, 31.3oC, and 21.3oC, respectively.

Decomposition of Oil Palm Empty Fruit Bunches of Various Sizes Treated With Excelzyme Habibullah, Fakhrul; Prawito, Priyono; Hasanudin; Widiyono, Heru; Purwanti, Sri
TERRA : Journal of Land Restoration Vol. 8 No. 1 (2025)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/terra.8.1.30-36

The rapid expansion of the palm oil industry has led to an increased accumulation of Oil Palm Empty Fruit Bunches (OPEFBs), creating significant environmental challenges due to their slow decomposition rate and high lignin content. This study investigates the decomposition of OPEFBs of varying sizes treated with Excelzyme, a commercial enzyme formulation designed to enhance lignocellulosic biomass degradation. The research was conducted using a 2 factor Completely Randomized Design (CRD), with Excelzyme dosages (250 mL, 375 mL, and 500 mL) and OPEFB sizes (unchopped, 2-5 cm, 1-2 cm, and <0.5 cm) as treatment factors. The decomposition process was evaluated based on temperature fluctuations, pH, total nitrogen, organic carbon, and lignocellulosic composition (hemicellulose, cellulose, and lignin) over an 8-week period. Results indicated that Excelzyme significantly influenced organic carbon reduction, hemicellulose degradation, and lignin breakdown, with higher dosages accelerating the decomposition process. The size of OPEFBs also played a crucial role, as smaller particle sizes facilitated microbial and enzymatic activity, leading to more efficient decomposition. Statistical analysis revealed significant interactions between enzyme dosage and OPEFB size, with the combination of 500 mL Excelzyme and <0.5 cm OPEFBs showing the highest decomposition rate. Temperature monitoring indicated a peak around week 5, suggesting optimal microbial activity and enzymatic breakdown at this stage. These findings highlight the potential of Excelzyme treatment in optimizing OPEFB decomposition, offering a sustainable approach to managing palm oil industry waste. The study contributes to improved biotechnological strategies for waste management and resource utilization, paving the way for enhanced agricultural sustainability and environmental conservation.

Soil Structure and Carbon Pools in Response to Common Tropical Agroecosystems Handayani, Iin Purwati; Prawito, Priyono
JOURNAL OF TROPICAL SOILS Vol. 18 No. 2: May 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i2.105-113

Maintaining soil physical properties and organic C is the goal for sustainable use of soil resources in agroecosystems. The objectives of this research were to evaluate the changes in soil structure and C pools and to quantify the availability of labile C pools. The study site was in Bengkulu Province Sumatra, Indonesia. Four common agroecosystems were used to determine soil physical properties including bulk density, porosity, and soil aggregates. Labile soil C pools examined were particulate organic C (POC), microbial biomass C (MBC) and C mineralization (C min). Farming practices significantly affected the bulk density, macro-porosity, micro-porosity, aggregate stability(AS), mean weight diameter (MWD) and aggregation ratio (AR). However, the responses from treatments depend upon the soil depth. In general, agroforestry and fallow fields provided lower bulk density, higher porosity, AS, MWD and AR compared to rubber tree plantation and grain cropping. As a general trend, the values of POC, MBC and C min decreased in the order of agroforestry > fallow field > rubber tree plantation > grain cropping. The order of labile C pools in all fields were POC > MBC > C min. Significant increases (32 – 62%, p<0.05) in the soil organic C content was observed in agroforestry and fallow fields compared to rubber tree plantation and grain cropping systems at the depth of 0 – 20 cm. The highest available POC (43 to 82%) and MBC (2 to 5%) were found in agroforestry and fallow field. Mineralized C was about 2% in all fields indicating similar amount of active C from soil organic matter. In conclusion, improvement in soil structure properties, TOC, POC and MBC in agroforestry andfallow fields indicates better soil C sequestration and soil quality in these agroecosystems.Keywords: Aggregation, carbon mineralization, microbial biomass carbon, particulate organic carbon, rubber plantation[How to Cite: Handayani IP and P Prawito. 2013. Soil Structure and Carbon Pools in Response to Common Tropical Agroecosystems. J Trop Soils 18 (2): 105-113. Doi: 10.5400/jts.2013.18.2.105][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.2.99]REFERENCESAhn MY, AR Zimmerman, NB Comerford, JO Sickman and S Grunwald. 2009. Carbon mineralization and labile organic carbon labile pools in the sandy soils of north Florida watershed. Ecosystems 12: 672-685. Anderson JPE. 1982. Soil Respiration. In: AL Page, RH Miller and DR Keeney(eds). Methods of Soil Analysis part 2, chemical and microbiological properties, 2nd ed. American Society of Agronomy and Soil Science Society of America. Madison, WI, pp. 831-872.Anderson TH and KH Domsch. 1990. Application of ecophysiological quotients (qCO2 and qD) on microbial biomass from soils of different cropping histories. Soil Biol Biochem 22: 251-255.Baker BJ, NR Fausey and KR Islam. 2004. Comparison of soil physical properties under two different water table management regimes. 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Vermicompost Buffering Capacity to Reduce Acidification of Pb and Cd Contaminated Inceptisols and Entisols Muktamar, Zainal; Hermawan, Bandi; Wulandari, Wulandari; Prawito, Priyono; Sudjatmiko, Sigit; Setyowati, Nanik; Fahrurrozi, Fahrurrozi; Chozin, Mochammad
JOURNAL OF TROPICAL SOILS Vol. 26 No. 1: January 2021
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2021.v26i1.1-9

Contamination of heavy metals on the soil leads to an increase in its acidity. Vermicompost application is commonly used to improve the properties of soil. The study was carried out to determine the reduction of the acidity in Pb and Cd contaminated soils under the application of vermicompost. Two laboratory experiments were set using Completely Randomized Design (CRD) with two factors. The first factor was soil samples, vis Inceptisols, and Entisols, and the second factor was the rates of vermicompost, consisted of 0, 5, 10, 15 g kg-1. The treatment combination was repeated three times. The soils were pretreated with 10 mg kg-1 Pb or Cd using Pb(NO3)2 and Cd(NO3)2. Three hundred kg soil sample was incorporated with vermicompost and placed in a 500 ml plastic bottle. The mixtures were incubated for eight weeks, and the moisture of the soil was maintained at field capacity. The acidity and soil temperature were monitored every week. The study indicated that Pb contaminated soil acidity increased to the sixth week of the incubation and decreased afterward. However, the acidity of Cd contaminated soil was consistently increased during the incubation. Treatment of vermicompost significantly lowered the acidity of both Pb and Cd contaminated soils. Contaminated Entisols had a higher response to the application of vermicompost than that of Inceptisols. This finding is significant in assessing acidity risk and possible management intervention for Pb and Cd contaminated soils.

Dampak Pemberian Pupuk NPK dan Dolomit pada Media Tanam terhadap Pertumbuhan, Hasil, dan Kualitas Limbah Baglog Jamur Tiram Askhari, Muhammad Yudha; Barchia, M Faiz; Prawito, Priyono; Muktamar, Zainal; Putri, Elsa Lolita; Widiyono, Heru; Utami, Kartika
Cannarium Vol 23, No 2 (2025)
Publisher : Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/cannarium.v23i2.10396

Penelitian ini bertujuan mengevaluasi pengaruh perlakuan dolomit dan NPK terhadap sifat kimia baglog, pertumbuhan dan hasil jamur tiram putih (Pleurotuss ostreatus), serta potensi pemanfaatan limbah baglog sebagai bahan pupuk organik. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan lima perlakuan : kontrol (A0), NPK 5,6 g/baglog (A1), NPK 11,2 g/baglog (A2), dolomit 5,6 g/baglog (A3) dan dolomit 11,2 g/baglog (A4), masing-masing diulang tiga kali. Parameter yang diamati meliputi kandungan C-organik, N-total, rasio C/N, P-total, K-total, pertumbuhan morfologi tubuh buah (lebar tudung, tebal tudung dan panjang batang), berat segar jamur, jumlah jamur per rumpun, berat baglog pasca panen dan rasio efisiensi biologis (REB). Hasil penelitian menunjukkan bahwa pemberian NPK dan dolomit berpengaruh nyata terhadap kandungan C-organik, N-total, C/N, P-total dan K-total media. Perlakuan A2 menghasilkan kadar N, P dan K tertinggi, sedangkan kadar C-organik tertinggi diperoleh pada perlakuan kontrol (A0). Namun, perlakuan NPK dan dolomit tidak berpengaruh nyata terhadap pertumbuhan morfologi maupun hasil jamur. Perlakuan dolomit dosis tinggi (A4) cenderung meningkatkan berat jamur, tetapi menurunkan REB. Limbah baglog dari perlakuan NPK (A2) memiliki kualitas kimia lebih baik untuk digunakan sebagai bahan pupuk organik. Hasil ini mengindikasikan bahwa suplementasi NPK dosis 11,2 g/baglog direkomendasikan untuk meningkatkan kualitas limbah baglog, meskipun tidak meningkatkan produktivitas jamur secara siginifikan.

Kandungan NPK Kulit Kopi dan Serbuk Kayu Terhadap Pertumbuhan Jamur Tiram dan Efek Sisa Kompos Baglog Ulandari, Nirwana; Barchia, M Faiz; Prawito, Priyono; Putri, Elsa Lolita; Muktamar, Zainal; Kamil, Maulana Insanul
Cannarium Vol 23, No 2 (2025)
Publisher : Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/cannarium.v23i2.10395

Penelitian ini bertujuan membandingkan pengaruh campuran kulit kopi dan serbuk kayu sebagai media tanam terhadap pertumbuhan, produktivitas jamur tiram (Pleurotus ostreatus) dan kandungan unsur hara makro baglog. Rancangan penelitian menggunakan Rancangan Acak Lengkap (RAL) dengan lima perlakuan komposisi media (P1: 100% kulit kopi, P2: 75% kulit kopi + 25% serbuk kayu, P3: 50% kulit kopi + 50% serbuk kayu, P4: 25% kulit kopi + 75% serbuk kayu, P5: 100% serbuk kayu) dan masing-masing di ulang tiga kali. Variabel yang diamati meliputi kandungan C-organik, N-total, Rasio C/N, P-total, K-total awal dan akhir media, lebar dan tebal tudung, panjang tangkai, berat jamur, jumlah jamur per rumpun, berat jamur+baglog, berat baglog pasca panen dan nilai REB. Hasil analisis ragam menunjukkan bahwa perbedaan komposisi media berpengaruh nyata terhadap seluruh variabel pengamatan. Perlakuan P3 menghasilkan jumlah jamur per rumpun dan nilai REB tertinggi (98,58%), sedangkan P5 memberikan bobot panen terbesar (121,33 g) dan lebar tudung terbesar. Kombinasi kulit kopi dan serbuk kayu pada perbandingan 50:50 menghasilkan keseimbangan rasio C/N dan ketersediaan unsur hara yang mendukung pertumbuhan optimal jamur tiram. Penelitian ini merekomendasikan pemanfaatan kulit kopi hingga 50% sebagai media tanam alternatif yang berkelanjutan, sekaligus mengurangi limbah pertanian dan meningkatkan efisiensi produksi jamur tiram.

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