Agricultural productivity in Buru Island, Maluku is threatened by tailings which are generated from formerly gold mine in Botak Mountain in Wamsait Village. Gold that extracted by using mercury was carried out in mining area as well agricultural field. High content of mercury in tailings and agricultural field pose a serious problem of food production and quality; and further endangers human health. The purpose of this research was to determine the contaminant level of mercury in tailing, soil and its accumulation in edible part of some food crops. Soil, tailing and plant samples for Hg testing were taken by purposive method based on mining activities in Waelata, Waeapo and Namlea sub district. Six soil samples had been analyzed for their chemical properties. Total mercury levels in tailings and plants were measured by Atomic Adsorption Spectrophotometer. This study showed that agricultural field where tailings were deposited contained Hg above the threshold but agricultural area which is far from hot spot did not. Most edible parts of food crops accumulated mercury more than Indonesian threshold for mercury content in food. This evidence explained that tailings deposited on the surface of agricultural field had an impact on soil quality and crop quality. Tailing accumulated on soil will decreased soil quality since naturally soil fertility in agricultural field in Buru is low.
Soil contains many elements, both macro, micro and metal. Metal elements are generally nonessential. Cobalt (Co) is one of the metallic elements but required in very small amounts for life. At high concentrations of cobalt can cause poisoning. One way to reduce high levels of cobalt in the soil by performing bioremediation plus ameliorant materials. This study consists of two stages. The first stage is the pot scale research with factorial design. The first factor is the bioremediator dose, namely : B0 : Without bioremediator (control), B1 : Bioremediator 20 kg ha -1 , B2 : Bioremediator 50 kg ha -1 and the second factor is the application of ameliorant materials, namely: A0 : No ameliorant (control), A1: Biochar + compost (1: 5), A2 : Biochar + compost (2: 5), A3 : Activated charcoal + compost (1 : 5), A4 : Activated charcoal + compost (2 : 5). The second stage is the four best results from the first stage applied in situ on the lysimeter. The results showed that the treatment of bioremediator with a dose of 20 kg ha -1 and activated charcoal + compost (w: w = 2: 5) was able to reduce Co levels in the soil by 76%. The lowest Co level in rice that is equal to 3.06 mg kg -1 was obtained from the treatment of 50 kg bioremediator ha -1 plus active charcoal + compost ameliorant (1: 5).
Assessment of heavy metals contamination was carried out in agricultural soil in Wanasari, Brebes Regency, Central Java Province. The study purposed to assess the level of metal contamination using statistical analysis, contamination factor (CF), geo-accumulation index (I-geo), and load pollution index (PLI). In this research, a total of 18 topsoil samples were taken and analyzed for the several metal concentrations are Pb, Cd, Cr, Co, and Ni. The concentration of heavy metals in soil samples was in the order of Cr > Ni > Pb > Co > Cd. The I-geo values of Pb, Co, Ni, and Cr indicated uncontaminated soils, while I-geo values for Cd showed level contamination in soil was uncontaminated to moderately contaminated. The values of pollution load index (PLI) indicated that these observed samples in agricultural soils for shallot in Wanasari, Brebes Regency were uncontaminated.
Dampak kegiatan industri adalah pencemaran air dan tanah pertanian yang mengurangi daya dukung lahan untuk produksi tanaman. Pertumbuhan industri yang meningkat dengan pesat di wilayah Daerah Aliran Sungai memungkinkan terjadinya pencemaran berbagai jenis logam berat di lahan sawah. Tujuan penelitian ini adalah mengkaji kemampuan tanaman mendong (Fimbristylis globulosa) yang ditanam dengan inokulasi bakteri penghasil eksopolisakarida Azotobacter maupun arang aktif dalam menurunkan kandungan kadmium (Cd) dan timbal (Pb) dari tanah serta meningkatkan serapannya di tanaman mendong. Penelitian rumah kaca ini menggunakan Rancangan Acak Kelompok dengan empat perlakuan yang diulang tiga kali. Hasil penelitian menunjukkan bahwa saat mendong berumur 4 minggu, inokulasi Azotobacter dengan dan tanpa arang aktif menurunkan kandungan Pb tanah, tetapi baik Azotobacter maupun arang aktif tidak mempengaruhi kadar Cd dan Pb di tajuk dan akar mendong. Namun, empat minggu kemudian, Azotobacter maupun arang aktif meningkatkan Kandungan Pb di akar mendong.
Shallots have been widely planted as the primary commodity crop in Brebes Regency, Central Java, Indonesia. Information on the distribution of heavy metals in the shallot fields of Brebes Regency, Central Java, Indonesia, is not yet available. Hence, the present study was conducted to identify the concentration and spatial distribution of several heavy metals (Pb, Cd, Co, Cr, and Ni) and their possible sources in the shallot fields through a field survey and a series of laboratory and statistical tests. The total concentration of heavy metals was analyzed from 184 sampling points of the shallot fields in Brebes Regency, Central Java, Indonesia, during the dry season from August to October 2019. The heavy metals concentration was as follows: Cr > Ni > Pb > Co > Cd. The values of total Pb, Cd, Co, Cr, and Ni concentrations in the soils were 7.84–18.94, 0.99–2.31, 3.02–9.98, 10.40–49.55, and 10.17–26.62 mg kg−1, respectively. All these concentration values of heavy metals are still lower than the critical values for agricultural soils and lower than the topsoil background values except Cd. Based on the concentration of heavy metals, the shallot fields in Brebes Regency, Central Java, are classified as uncontaminated soils. Multivariate and geostatistical analyses were employed to determine and describe the metals’ origin. Pb, Cr, and Ni mainly originate from a natural source, while Cd and Co are from anthropogenic sources (agricultural practices and industry).
The agricultural sector is still the leading sector of the economy in Wonosobo Regency. Its superior commodities include paddy rice, tea, tobacco, coffee, and vegetable plants. In the practice of agricultural activities, it is inseparable from the use of inorganic fertilizers and persistent chemical pesticides that cause heavy metal contamination in agricultural land. Industrial waste around agricultural land that enters the water body also contributes to the accumulation of heavy metals in the soil of the water for irrigation. This study aimed to determine the distribution of heavy metal content of Pb, Cd, Ni, Co, Cr, and As on the agricultural land of Wonosobo Regency. The study was conducted on the agricultural land of Wonosobo Regency. As many as 312 soil samples were taken from a layer of sports (depth of 0-20 cm) of agricultural land in ten sub-districts of Wonosobo Regency. Soil sample analysis included heavy metals Pb, Cd, Ni, Co, Cr, As, organic Carbon, CEC, and soil texture. The analysis was carried out in an integrated laboratory, the Agricultural Environment Research Center. The results showed the concentration of heavy metals detected in Wonosobo Regency agricultural land respectively Pb > Co > Ni > Cr > As > Cd. These heavy metals in the soil are still in normal concentrations and are safe for agricultural land.
In the recent years, there are many commercial organic fertilizers sold in the free market. However, many of these organic fertilizers have not only low quality but some of them are also contain undesirable such as heavy metals. In order to control the quality of commercial organic fertilizers in the market, the Ministry of Agriculture Republic of Indonesia had issued a Ministerial Agriculture Regulation (No.28/Permentan/SR.130/5/2009). This Ministerrial Agriculture Regulation had been renewed with the Ministrial Agriculture Regulation No.70/Permentan/SR.140/10/2011. To evaluate the effectiveness of these regulation to control the quality of organic fertilizer in the market, a study was carried out. As much as 60 organic fertilizer samples in total had been collected from Wast Java (20 samples), Central Java (20 samples) and East Java (20 samples). The samples were collected from the farmers, kiost or fertilizer detailers as well as taken directly from organic fertilizer producers. The samples were analyzed according to the procedures described in the attachment of the Minister Decree. Not all parameters in the Minister of Agriculture Decree No. 70 2012 were analyzed.
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