Jurnal Ilmu Tanah dan Lingkungan

Characteristics of Klawoguk Watershed In Sorong City, Southwest Papua

Mon, 01 Apr 2024 00:00:00 +0700

Floods have become the biggest disaster in the last decade. This study aims to examine the characteristics of the Klawoguk Watershed which are expected to contribute in planning, managing and mitigating floods in Sorong City. This study used survey methods, spatial analysis and field observations. The results showed that the characteristics of the Klawoguk watershed have a very wet tropical climate type with rainfall throughout the year without a recognized dry season. In an oval-shaped watershed, it is possible for the water to take longer to reach the water's end point. The flat topography covering an area of 2,599.30 ha has become the urban area of Southwest Papua Province including the villages of Sawagumu, Malaingkedi, Klasabi, Kalwalu and Klamana which are prone to flooding. In the last seven months the flow regime coefficient (CRF) has been changing, dominated by very low, which means that the water flow in the Klawoguk river is more stable. The sediment is dominated by very high podzolic soil types and there is degradation of protected forest by taking soil and C excavation which causes an increase in sediment yield in rivers.

Synthesis of Zeolite-Geopolymer Composite Granules and Their Adsorption on Methylene Blue

Haditsah Salsabila, Zaenal Abidin, Irma Isnafia Arief, Trivadila — Mon, 01 Apr 2024 00:00:00 +0700

Indonesia is one of the largest textile industrial producers in Southeast Asia. The high production of textile goods and the inadequate processing of textile wastewater have made Indonesia is the country which has the largest textile industry wastewater in Southeast Asia. Textile liquid waste, which is mostly dye waste, needs to be managed so that it does not have a negative impact when the liquid waste is released into the waters. One of the dye waste management techniques is by using adsorbent materials such as zeolite. In this study, zeolite was composited with geopolymer and formed into granules in order to have high adsorption capacity and resistance. The composite was synthesized by mixing zeolite, metakaolin and sodium silicate (Na₂SiO₃), then dried in an oven at 100 °C for 2 hours. The samples used were then tested for adsorption on methylene blue. Sample precursors were also characterized using XRD and SEM. The results of the adsorption test showed that the zeolite-geopolymer granule composite has an adsorption capacity of 52.68 mg/g for small granules and 20.85 mg/g for large granules so that it can be applied in aquatic environments.and could be applied to aquatic environments.

Estimation of Rice Age in Sentinel-2 Image with Gaussian Mixture Model Approach

Muhammad Ardiansyah, Khursatul Munibah, Nadhifah Raniah — Mon, 01 Apr 2024 00:00:00 +0700

Monitoring the growth phase or age of rice is carried out to estimate the harvest area and production of rice plants. Remote sensing technology can monitor the age of rice plants, one of which is using Sentinel-2 imagery. This research aims to identify the age of rice plants, and to map/monitor the spatio-temporal distribution of rice age using GMM classification on multi-temporal Sentinel-2 images. The GMM classification is a simple method based on density function. The research was carried out in rice fields at the Agency of Agriculture, Plantation, Food and Horticulture, Cianjur Regency, West Java Province, with observation periods from May - August 2021. The results of the research showed that the temporal spectral response was different between the visible band (blue, green and red) and the near infrared band, where the 3 visible bands have a similar pattern with a lower value than the near infrared band. Result of GMM classification can show the continuity of rice age classes at each image acquisition from 0 - 130 days after planting, so it can be used to monitor the age or growth phase of rice.

Synthesis of Geopolymer-Zeolite Granule Composite from Local Raw Materials Using the Hydrothermal Method as Methylene Blue Adsorbent

Rosida, Zaenal Abidin, Sri Sugiarti — Mon, 01 Apr 2024 00:00:00 +0700

Zeolite is known as a cation exchange adsorbent and has high adsorption capabilities. These two functions of zeolite have the opportunity to be a solution in dealing with cationic dye waste. The aim of this research was to determine the CEC value and adsorption capacity of zeolite in adsorbing methylene blue. Zeolite powder is made using local metakaolin and added NaOH or water glass using the hydrothermal method. The powdered zeolite product obtained was mixed with geopolymer to form a composite of small granules and large granules. The results of XRD characterization of the synthetic product obtained from a mixture of metakaolin and NaOH were NaA zeolite, while the addition of water glass resulted in NaX zeolite. Zeolite in powder form or geopolymer-zeolite granule composite shows a high cation exchange capacity (CEC) above 200 cmol/kg. The methylene blue adsorption test on each adsorbent showed that the adsorption capacities of NaA zeolite, NaX zeolite, NaA geopolymer-zeolite small granule and large granule composites, and NaX geopolymer-zeolite small granule and large granule composites were respectively 30.81 mg g^-1, 32.84 mg g^-1, 53.29 mg g^-1, 51.64 mg g^-1, 38.32 mg g^-1, 54.22 mg g^-1 and 48.81 mg g^-1.

Determination of the Critical Limit of Phosphorus for Shallot Growth in Brebes Regency, Central Java

Arief Hartono, Desi Nadalia, Muhammad Ramadhan Fauzi Sulistiono — Mon, 01 Apr 2024 00:00:00 +0700

Intensification of balanced fertilization is one way to improve shallot quality and production to meet market demand. In order to achieve optimal crop yields, soil phosphorus (P) availability must be above a critical level. This study aimed to determine the critical limit of the P nutrient and determine the best extractor between Bray 1, Olsen, Mehlich I, and 25% HCl and evaluate the effect of P fertilization on the growth of shallot plants in Brebes Regency, Central Java. Determination of the critical level of P in the soil was determined by extracting soil P from 16 locations spread across Brebes Regency. P fertilization was carried out by applying KH₂PO₄ solution as much as 0, ½X, X, and 2X where X is the recommended dose of P fertilization in the form of P₂O₅ of 120 kg ha^-1. The plants were harvested six weeks after planting. The critical level of soil P is determined using the Cate and Nelson method. The results showed that each P extraction had different correlation coefficient values influenced by the type of extractants. The correlation coefficients between soil P nutrient content extracted by Bray 1, Olsen, Mehlich 1, and HCl 25% methods and plant dry weight were 0.630, 0.341, 0.821, and -0.089, respectively. The correlation values for Bray 1 and Mehlich 1 methods with plant dry weight were statistically significant and highly significant, respectively. The critical limit of soil P content to achieve 90% of relative yield of shallots in Brebes district based on Bray I, and Mehlich I methods were 40 ppm P. The best soil P extractant in Brebes was Mehlich 1. Fertilization was recommended on soils with soil P content less or equal to 40 ppm P.

Effects of Steel Slag, Fly Ash and Bottom Ash on the Growth of Rice Plant in Peat Soil

Laili Purnamasari, Arief Hartono, Untung Sudadi, Linca Anggria — Mon, 01 Apr 2024 00:00:00 +0700

Industrial activities in Indonesia generate waste such as steel slag, fly ash and bottom ash which contain macro, micro and beneficial nutrients. These industrial wastes are able to improve the quality of soil such as peat soil. However, these waste materials also contain toxic heavy metals that need to be assessed. This study aimed to evaluate the influence of steel slag, fly ash and bottom ash on the chemical properties of peat soil, the growth of rice plant (IR 64 variety), yield production and content of toxic heavy metals in rice. The ameliorant applied in each treatment were 0; 2,5; 5,0; 7,5 and 10,0% of the oven-dry soil weight. The incubation experiments showed that the addition of steel slag and fly ash was able to increase pH, available Ca, Mg and Si. Meanwhile bottom ash treatment only slightly improved the chemical properties of peat soil. In the green house experiment, the addition of steel slag, fly ash and bottom ash to peat soil was able to improve the growth of rice plant and yield production. The positive response of rice plants was related to increasing peat soil pH and availability of Si, Ca and Mg derived from the soil amendments. The rice did not contain Pb but contained Cd metals. Cd content in rice was within the maximum permissible limit for the heavy metal contaminants in the rice polished according to SNI 6128:2020.