Jurnal Lahan Suboptimal : Journal of Suboptimal Lands
Not a member yet
333 research outputs found
Sort by
Utilization of coal burning waste fly ash as a soil improving material in red yellow podsolic soil
No full textThis research aimed to characterize and test the chemical properties of red-yellow podzolic soil and fly ash. The experiment was conducted using polybags with various dosage levels of 2 types of red-yellow podzolic soil, as well as fly ash. Dolomite was used as a control. The experiment used 3 types of experiments with 3 repetitions on the soil (A1=10 g of fly ash /polybag, A2=15 g of fly ash/polybag, A3=20 g of fly ash/polybag, and A0=10 g of dolomite/polybag as a control). The results showed that the application of fly ash waste can increase the pH of podzolic soil. There was an increase in K-dd from 0.34 to 1.36. Al-dd analysis of the addition of fly ash ameliorant Al-dd levels decreased quite significantly with an average of 5.26‒7.16. Al-dd levels were very low in treatment A3 with the addition of 20 g/polybag. H-dd analysis on Red and Yellow Podzolic soils resulted in an increase in the initial H-dd of the soil from 0.4 to 4.61‒7.16. The highest H-dd was in A2 with the addition of 15 g of fly ash/polybag and the lowest H-dd iss in treatment A3 with the addition of 20 g/polybag
Limiting factor for developing soybean under tropical climatic conditions in lowland areas of Tanjung Lago Banyuasin District
No full textTidal lowlands have a wide distribution in Indonesia and have the potential to support the development of soybean cultivation. However, soybean cultivation in the tidal lowlands often faces various challenges. The study aimed to identify land suitability, limiting factors, and soybean cultivation strategies in tidal lowland type B. This study used a survey method, and sampling points were determined by the purposive sampling method. The research was carried out in several stages, namely preparation, field activities, laboratory analysis, and data analysis. Data analysis was carried out by matching the results of field and laboratory analysis with the requirements for soybean land suitability. The results of the study showed that the research land was moderately suitable for soybean cultivation in terms of the actual land suitability level, namely S3-wa, nr, na, and xs with limiting factors of rainfall, soil pH, C-Organic, K2O, and pyrite depth. While the potential land suitability class could be done by improving irrigation and drainage channels, liming, adding organic matter, fertilization, and regulating the water level with high-level management (++) to potential suitability S1 (very suitable) and for pyrite problems (FeS2) through moderate management (+) with groundwater level control to potential suitability S2 (moderately suitable). Management recommendations that can be applied to soybean cultivation were to regulate planting patterns and micro water management
Dynamics of soil organic matter, bulk density and infiltration rate on mining reclamation land
No full textPost-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
Biology and management of the insect pest threatens global maize production, fall armyworm, Spodoptera frugiperda: an Africa and Asia perspective
No full textFall armyworms, Spodoptera frugiperda (J./E. Smith) are among the most serious insect pests in maize and many other crops, particularly in some Asian countries and sub-Saharan Africa. The study aimed to explores the significance of the biological characters and the management strategies to reduce damage caused by FAW. Understanding this destructive insect pest will guide maize growers and agricultural professionals to develop the most effective and sustainable FAW control methods. The caterpillar fed on the leaves and interferes with pollination and fertilization processes, significantly reducing the yield losses in maize, which was one of the main staple food for most smallholder farmers in Africa. Due to their immediate action, synthetic chemical pesticides were the most conventionally used in the control of FAW, even though this method had many weaknesses, including environmental pollution, food safety concerns, insecticide resistance, and effects on non-target organisms. In recent years, biological control agents (BCAs) have been developed as an alternative to the conventional use of chemical pesticides in integrated pest management (IPM) systems of FAW pests. The present BCAs of FAW were parasitoids, predators, and entomopathogens
Total suspended solid distribution mapping using sentinel-2A imagery in Ketapang Waters, South Lampung
No full textThe 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
The growth and yield of Capsicum annuum L. variety Gada F1 on NPK 16:16:16 fertilizer
No full textRed chili was one of the most strategic vegetable commodities because the market demand was high every day. Efforts to increase chili productivity were needed so that chili prices were stable and market demand was met. The research aimed to determine the growth and yield of the red chili Gada F1 variety against NPK 16:16:16 fertilizer. This research uses the Randomized Block Design (RBD) method, consisting of 4 treatment levels and 3 replications. P0 = control, P1 = NPK fertilizer 2.5 g/polybag, P2 = NPK fertilizer 5 g/polybag, and P3 = NPK fertilizer 7.5 g/polybag. The application of NPK 16:16:16 fertilizer to the growing medium significantly influenced several growth and yield parameters, including the number of leaves, crown diameter, leaf greenness, fruit weight, number of fruits, fruit length, and fruit diameter. In contrast, it had no statistically significant effect on plant height, flowering time, number of branches, root fresh weight, crown fresh weight, root dry weight, or crown dry weight. Among the treatments, the application rate of 7.5 g/polybag (P3) yielded the most favorable results across the majority of measured parameters. Accordingly, an NPK 16:16:16 dosage of 7.5 g/polybag was recommended for the cultivation of the red chili (Capsicum annuum L.) variety Gada F1
Response of soil physics properties to liquid organic fertilizer from liquid waste from tofu factories and banana tubers in ultisol
No full textProductivity in ultisols was not only determined by mineral content, but was also influenced by the physical properties of the soil. Soil physical properties were soil properties that were determined by its constituent materials such as water content, bulk density, total pore space and permeability. The study aimed to determine the effect of the application of liquid organic fertilizer from tofu factory liquid waste on the physical properties of soil in ultisols. This research was designed using a Completely Randomized Design (CRD) with six treatment levels (control treatment, single fertilizers N, P, and K as recommended doses, 125 ml, 250 ml, 375 ml and 500 ml Liquid Organic Fertilizer (LOF) from tofu factory wastewater and banana tubers. Each treatment was repeated 4 times, so there were 24 experimental units. The results showed that LOF treatment had a significant effect on bulk density, total pore space, and permeability and had no significant effect on moisture content in field capacity of green mustard plants in ultisols. The highest value obtained in the LOF treatment is at a dose of 250 ml which had a field capacity water content value of 29.63%, bulk density 0.95 g/cm3, total pore space of 64.00% and soil permeability of 11.56 cm/hour
Some chemical properties of mineral soil under peat layer at Sriwijaya Botanical Garden
No full textNatural peat forms from partially decomposed plant remains, at least 50 cm thick, accumulating in swamps over alluvial subsoil. The research aimed to identify peat maturity, peat depth and color of mineral soil. Additionally, to identify some soil chemical properties such as soil pH, N-total, C-organic and P-available under the peat layer in Siwijaya Botanical Garden. This study used a detailed survey method at a scale of 1:8,000 on peatland areas in Sriwijaya Botanical Garden covering 77 ha. Sampling was conducted using the systematic sampling method. The analysis of soil chemical properties was conducted in the laboratory. The study results showed that the thickness of the peat at the study location was dominantly very deep with a peat depth of >300 cm, the color of the mineral soil in the peat layer was predominantly gray and very dark gray, the pH value of the soil was very acidic with a value of <4.5, the C-Organic value was categorized as average to very high, the N-Total value was categorized as very low to average and the P-Available value was categorized as very low to low. Peat depths of more than 300 cm should be planted with conservation crops and further research needs to be done on the relationship between the chemical properties of the mineral soil under peat layers and the chemical properties of the peat soil
Growth and yield response of lettuce (Lactuca sativa L.) planted floatingly to optimization of NPK compound fertilizer
No full textUrban agriculture had expanded rapidly in response to growing population pressures and climate change, especially in densely populated areas of developed countries. South Sumatra holds significant potential for developing floating agricultural systems. This study aimed to evaluate the effects of compound NPK fertilizer and a floating planting system on lettuce growth. A Randomized Block Design (RBD) with four treatment levels was used. Each treatment was repeated 3 times, resulting in 12 treatment units. In the treatment of NPK compound fertilizer doses, P0 = Control, P1 = 1.12 g NPK compound/polybag, P2 = 2.24 g NPK compound/polybag, P3 = 3.36 g NPK compound/polybag. The observation results were analyzed using analysis of variance and the DMRT 5% test. The parameters observed include plant height, number of leaves, fresh weight of the plant, fresh weight of the roots, dry weight of the roots, root length, leaf greenness level, leaf area, and canopy area. Based on the research findings, the application of compound NPK fertilizer at a rate of 2.24 g/polybag (P2) resulted in the most favorable growth and yield performance of floating lettuce, as it consistently produced the highest mean values across all observed parameters. However, the calculated optimum dosage was 2.05 g/polybag. This rate is therefore recommended as the optimal application dose for subsequent studies
Pests and diseases of horticultural crops in Tanjung Seteko Village Indralaya District, Ogan Ilir Regency, South Sumatra
No full textCultivation 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