Jurnal Lahan Suboptimal : Journal of Suboptimal Lands

Using the kriging method to establish a spatially reliable interpolator for peat depth variability

Tue, 01 Apr 2025 00:00:00 +0700

Peatlands (according to the Governmental Regulation nr 71/2014) can be utilized for agriculture and plantation if the peat depths are less than 3 m or more than 3 m, peatlands have to be conserved or restored. Determining peat depths can be conducted in the fields by intensive surveys which were so expensive, inefficient, and ineffective, therefore it was essential to find our simple alternative methods how to measure peat depths easily. The research aimed to establish a spatially reliable interpolator for peat depth variability by utilizing the kriging method. The research was conducted in Seponjen Village, Kumpeh, Muaro Jambi, Jambi Indonesia. Primary data were processed by applying ArcGIS 10.3 software. The interpolated dataset of peat depths validated their actual dataset and performed an excellent relationship (indicated by a positive correlation coefficient, r = 0.920) and a coefficient of determination (R² = 0.847). It indicated that the interpolated dataset could be utilized to make maps by kriging. The very deep peat (Site A) and the deep peat (Site B) showed a tendency for a strong autocorrelation of the data distribution of peat depths. Autocorrelation tended to be anisotropic towards the river on the shallow peat (Site C). A good interpolator of peat depth variability can be generated using the kriging method.

Total suspended solid distribution mapping using sentinel-2A imagery in Ketapang Waters, South Lampung

Ahmad Al Fadel, Ellis Nurjuliasti Ningsih, Tengku Zia Ulqodry — Tue, 01 Apr 2025 00:00:00 +0700

The distribution of total suspended solids (TSS) in coastal waters significantly affects water turbidity and light penetration, which affects aquatic ecosystems. The research aimed to compare the accuracy of algorithms using Sentinel-2A imagery to map the distribution of TSS in Ketapang Waters, South Lampung. Polynomial regression analysis and validation tests using R² and RMSE were performed to assess accuracy. The results showed that the Laili algorithm performed better, achieving an R² value of 0.9723 and a lower RMSE of 0.639, with TSS concentrations ranging from 17.26 to 22.90 mg/L. The derived third-order polynomial regression model y = -0.0228x³ + 1.3401x² - 25.16x + 170.08 effectively predicted TSS concentrations. Spatial distribution analysis showed higher TSS levels near the coastline, likely due to sediment input from human activities and natural hydrodynamic processes, which gradually decreased towards the offshore area. These findings demonstrate the potential of the Laili algorithm for remote sensing-based water quality monitoring in dynamic coastal environments. Future research should include seasonal variations and explore the integration of multiple algorithms to improve the accuracy of TSS estimation and better understand temporal fluctuations in coastal sediment dynamics.

Integration of geographical information systems in the land suitability assessment for rice crops in Sleman District, Indonesia

Sukron Romadhona, Sri Puryono, Mussadun Mussadun — Tue, 01 Apr 2025 00:00:00 +0700

Pests and diseases of horticultural crops in Tanjung Seteko Village Indralaya District, Ogan Ilir Regency, South Sumatra

Tue, 01 Apr 2025 00:00:00 +0700

Cultivation of horticultural crops is often faced with the problem of plant pests, namely pests and plant diseases which cause plant productivity to decrease. In controlling pests and diseases, farmers often use synthetic pesticides, but farmers use pesticides that do not comply with regulations. The research aimed to identify species of pests and diseases in horticultural crops and farmers' in Tanjung Seteko Village, Indralaya District, Ogan Ilir Regency, South Sumatra in controlling pests and diseases of horticultural crops. This research method used purposive sampling and direct observation in the field. The farmers who were interviewed were farmers who grew horticultural crops. The results of this research found that vegetation around plants influences the diversity of pests and diseases. There were 8 pest species found with the highest attack rate of 17.56%, namely Diaphania indica attacks and the lowest attack intensity was Valanga sp. 0.19%. There were 8 types of diseases found with the highest attack rate being 41.11% (Cucumber mosaic virus) and the lowest at 0.56% (fusarium wilt). Pest and disease control with the application of synthetic pesticides by farmers was in a good category. The scoring of farmer’s respondent statements in Tanjung Seteko Village was obtained with a score range of 28-41. The scoring results show that farmer’s behavior in using pesticides is in the good category.

Performance of intercropping corn on manure oil palm plantations on dry land

Tue, 01 Apr 2025 00:00:00 +0700

The intercroping area (IC) is around 0.5 ha from one hectare of mature oil palm (YH). The research aimed to observe the growth and yield of corn from the Bisi 16 variety in oil palm plantations from the SJ 5 variety and the effect of corn as IC on oil palm. The research location was in Mesuji Raya Sub-district, Ogan Komering Ilir, South Sumatra, from April 2024 to July 2024. The interspace number of oil palm of 1 ha were 12 and it was six interspaces as the object research was as frond staking. The research method used was non-experimental. Each of front staking had two sample plots of corn (3×3 m), and samples selected for each plot were 15 crops. For oil palm (8×8×8 m) two samples of crops were beside the corn plot. The total of oil palm samples was 24 crops from oil palm IC, and compared to 24 crops from monoculture. The research results showed that the growth of IC corn was lower for plant height (16%), and the reduction in corn yield (26%) from one ha compared to the description. The total yield from corn IC was approximately 2.09 tons of corn shells, which were lower from monoculture description. The growth and yield of oil palm IC were better than monoculture, with an increase a number of fruit bunches (9%) and FFB weight (11%). Corn is an intercrop/polyculture crop in oil palm plantations after one or two years of production.

Growth and yield of lettuce (Lactuca sativa L.) grown on different planting media volumes in a floating cultivation system

Tue, 01 Apr 2025 00:00:00 +0700

Lettuce (Lactuca sativa L.) is one of the vegetables that is widely loved because of its taste and nutritional content. The increase in lettuce production can be increased by the use of swamp land with floating cultivation during the flood season. The size of the pots used in floating system cultivation will affect the growth and number of plants that will be produced. The study aimed to determine the optimal of planting media volume on the growth and yield of lettuce in floating cultivation system. The research used a randomized block design with 4 treatments of planting media volume, namely 1.9 L (P1), 2.7 L (P2), 3.6 L(P3), and 5 L (P4). Each treatment was repeated 4 times and each replication consisted of 5 plants. The results showed that at the beginning of the growth of the media volume of 2.7 L would be faster, but at the time of harvest almost all parameters showed that plants with a media volume of 5 L produced a larger plant weight than the plant unit. Although the use of smaller volumes of media results in a smaller plant weight, the raft is able to accommodate a larger number of pots. So that the use of a media volume of 1.9 L will be better used for floating lettuce production.

Conservation strategy based on soil erodibility with several land covers and slopes in the upstream of Air Bengkulu Watershed

Vinni Lovita, Bambang Sulistyo — Tue, 01 Apr 2025 00:00:00 +0700

Global land cover changes driven by increasing demand for agricultural, residential, and industrial land have caused various environmental issues, including soil erosion. The study aimed to analyze soil erodibility values upstream of the Air Bengkulu watershed based on land cover and slope factors. The analysis was conducted using soil samples obtained through purposive sampling based on soil map units, topography, and land cover. Soil erodibility values were determined through laboratory analysis of organic matter, texture, structure, and soil permeability, followed by calculating erodibility. After obtaining the distribution of erodibility values, the next step involves identifying erodibility values based on slope and land cover to analyze the interaction between slope and land cover on erodibility values. Conservation recommendations are provided based on slope, land cover and consideration of community aspects to reduce erodibility values and minimize erosion risk. Results indicate that soil erodibility in the Air Bengkulu watershed ranges from very low to very high, with most areas classified as low. The findings suggest that soil erodibility values vary depending on land cover and slope. Higher erodibility values were observed in areas with minimal land cover, especially in mining and cultivated land with poor management practices. In contrast, dense vegetation such as forests and well-maintained plantations significantly reduced soil erodibility values. The interaction between slope and land cover plays a crucial role in determining soil susceptibility to erosion risk. Vegetative and mechanical conservation strategies are suggested to mitigate erosion risks, improve land productivity, and support ecosystem sustainability in the region.

Analysis of consumption expenditures and determining factors of rice availability for households of lebak rice farmers in Kertapati District, Palembang

Yunita Yunita, Riswani Riswani, Selly Oktarina — Tue, 01 Apr 2025 00:00:00 +0700

Meeting nutritional needs is crucial for developing quality human resources, while food security depends on production capacity, purchasing power, and supply chain factors, influenced by socio-economic and ecological conditions. The research aimed to analyze the total income of farmer households, analyze the consumption expenditure of farmer households, and analyze the factors that influence the availability of rice for households of lowland rice farmers in Kertapati District, Palembang City. The research method used was a survey method. This research was carried out in July 2024 with a total of 50 samples selected simply at random. The data processing method used to answer the first and second objectives is mathematical calculations to calculate rice farming income, non-rice farming income and non-farming income, as well as calculating food and non-food consumption expenditure. Meanwhile, to answer the third objective, multiple linear regression analysis was used. The results of this research showed that: 1) The average total household income of Lebak rice farmers was 4,457,241 IDR/month. 2) household food consumption expenditure for Lebak rice farmers was 2,674,626 IDR/month, while non-food consumption expenditure was 1,594,396,- IDR/month. 3). The availability of rice for lowland rice farmers' households is 2.65 kg/month, which was included in the low criteria. Factors that influence the availability of rice for Lebak rice farming households were land area, income and age of the farmer. Land area and income has a positive effect, while farmer age has a negative effect.

Suboptimal Land Analysis of Agricultural Fishery Resources (Chitosan-Liquid Smoke Cocos nucifera) as Natural Food Preservatives

Selly Ratna Sari, Rani Ria Rizki, Guttifera Guttifera, Agung Riswandi — Tue, 01 Apr 2025 00:00:00 +0700

One of the suboptimal land resources is shrimp and coconut. Increasing productivity on suboptimal land is essential by utilizing typical land. A concern arises with the use of waste as a preservative. The necessity to replace preservatives made from chemical raw materials with natural alternatives is evident. The research aimed to determine and optimize the antioxidant properties of chitosan combined with liquid smoke from coconut shells (Cocos nucifera) as a natural food preservative. The study utilized a Completely Randomized Design (CRD) with 4 treatments repeated three times. The treatments consisted of different concentrations. The results indicated that varying concentrations of Cocos nucifera liquid smoke combined with sterilized glucose and chitosan had a significant effect on antioxidant analysis and the Maillard reaction. Higher concentrations of liquid smoke resulted in increased browning, likely due to the Maillard reaction occurring when glucose and chitosan were mixed with liquid smoke and then sterilized using an autoclave. This condition was expected to be favorable as it involves a reaction between free amino acids in chitosan and reducing sugar compounds from glucose. Additionally, aldehyde ketone compounds are found in Cocos nucifera coconut shell liquid smoke. Finally, the optimal concentration for antioxidant activity was treatment A2 (total concentration of 1% chitosan + 1% glucose + 3% coconut shell liquid smoke) with an IC₅₀ value of 6.69% and a brown absorbance of 0.45%.

Dynamics of soil organic matter, bulk density and infiltration rate on mining reclamation land

Bakri Bakri, As’ad Syazili, Zhoen Pristoyo Tampubolon — Tue, 01 Apr 2025 00:00:00 +0700

Post-mining land reclamation is carried out to restore the environmental functions of the land. Monoculture and multiculture planting patterns have different impacts on soil’s physical properties. This study aimed to determine the effects of analyzing soil organic matter, bulk density, and measuring soil infiltration rates in monoculture and multiculture planting patterns. The research used survey methods, data analysis through tabulation, and statistical techniques. The results indicated differences in soil physical properties between the two lands and among the variables. Mahayung land exhibited higher organic matter content (1.08%) compared to Banko land (0.66%). Additionally, the average infiltration rate in Mahayung land (3.02 cm/hour) was higher than in Banko land (2.56 cm/hour), and the bulk density in Mahayung land (1.40 g/cm³) was lower than in Banko land (1.62 g/cm³). Organic matter content influenced the infiltration rate by 70.69%, and affected bulk density by 49.39%. Finally, the different planting patterns affect soil physical properties, and the relationships among variables show significant results.

Growth response of lettuce plants to the application of NASA liquid organic fertilizer and cow manure

Suci Septrianda, Muhammad Ammar — Tue, 01 Apr 2025 00:00:00 +0700

Lettuce (Lactuca sativa L.) was a leafy vegetable that has high economic value in Indonesia and provides health benefits to consumers. The use of organic fertilizers is deemed more optimal than inorganic fertilisers due to the potential of inorganic fertilizers to cause soil damage and environmental pollution through chemical residues and land productivity reduction. The study aimed to evaluate the effects of using NASA liquid organic fertilizer and cow manure on the growth and yield of lettuce plants. The study used a Randomised Block Factorial Design with two factors: cow manure with four treatment levels and NASA liquid organic fertiliser with three treatment levels. The results showed that chicken manure had a significant effect on plant height, leaf area, leaf dry weight, and stem fresh weight at 28 days after planting (DAT), while NASA liquid organic fertilizer had no significant effect on all parameters except plant height at 7 DAT. Higher doses of chicken manure (S2 and S3) contributed to the increase in dry weight and fresh weight of leaves. Application of NASA liquid organic fertilizer at a dose of 4 ml/L (N2) showed a better response in supporting plant vigor than others. In addition, the highest plant fresh weight was obtained in the combination of S3 and N2 treatments, indicating a synergistic effect between the two types of organic fertilizers. High a dose of chicken manure (S3 = 900 g) can negatively affect growth by lowering soil pH and causing too acidic conditions that are not optimal for plants.

Antibacterial activity of ginger essential oil derived nanobactericide against the growth of phytopathogenic bacteria - A Review

Tue, 01 Apr 2025 00:00:00 +0700

Phytopathogenic bacteria infect various plants, causing economic losses, negative environmental consequences, and harming agricultural development. The most currently available antimicrobial agents for agriculture were potentially toxic, non-biodegradable, and cause significant harm to the ecosystem. As a result, novel, effective, safe, user-friendly, and alternative methods were urgently needed. Essential oils (EOs) have great potential in managing plant bacterial diseases because they successfully destroy various pathogenic bacteria. Ginger essential oil (GEO) is more widely used because it contains a diverse mixture of volatile substances, such as phenolic compounds, terpenes, polysaccharides, lipids, and organic acids. The antibacterial activity of the EO against phytopathogenic bacteria is significantly improved when it is converted into nanoparticles. Nanoparticles (NPs) that were derived from EOs have a considerable antibacterial action resulting from increased chemical solubility and consistency, minimal rapid evaporation, and slow depletion of the effective substances of EO. Ginger EOs were encapsulated in chitosan as a nanogel to improve the antibacterial effects and the consistency of the oils against pathogenic bacteria. Nanogel had been shown to amplify the antibacterial effect of EOs against pathogenic bacteria by enhancing their potential to disturb the integrity and permeability of the cell membranes. This paper focuses on three major parts of ginger essential oils: the antibacterial efficacy to control plant pathogenic bacteria, the possible mechanisms of action of essential oils as nanobactericides, and more importantly, the fabrication of bactericide nanoformulation.