Plants need cobalt (Co) for nitrogen fixation and encourage seedling growth. If the amount is excessive, cobalt causes a reduction in crop yield and poisoning. This study aims was to monitor the toxicity levels of cobalt in paddy fields. The study was conducted in the lowland rice fields of Karawang and Bekasi regencies by taking 394 samples of topsoil. The soil samples were collected by survey method. The analysis showed that all samples contained total cobalt, ranging from 0.477 to 31.829 ppm. The data is classified into 3 classes, namely: normal, normal-toxic and toxic under the quality standards of heavy metals in the soil [7]. The classification results showed that 391 samples are categorized as the normal class, 3 samples as the normal-toxic class, and there was no sample categorized as toxic class. The results of this study can be use as a reference for stakeholders to conduct land management to avoid cobalt poisoning.
Arsenic (As) contaminated agricultural land in Bima is due to the use of synthetic fertilizers and excessive pesticides in the shallot cultivation system. One of the efforts to remediate the contaminated soil by using the chelating agent. The research aims to study the ability of various chelating agents to remediate As contaminated soil and also examined the effect of chelating agents on arsenic concentration in shallot bulbs and production. The study was conducted at the shallot production center of Kalampa Village, Woha Subdistrict, Bima Regency, West Nusa Tenggara, which indicated As contamination. The experiment used a randomized block design with three replication and five chelating agents i.e. biochar-compost, chitosan, EDTA, ammonium thiosulfate, zeolite, and control. All treatment of chelating agents can reduce As in the soil up to 70% and significantly different with control. Arsenic content in shallot bulbs with chelating agents treatment is within the safe limit (<1 mg kg−1). Biochar-compost significantly increased the shallot yield. Meanwhile, EDTA treatment did not support shallot production. Biochar-compost and zeolite are recommended for application due to their ability to remediate arsenic in the soil, the lowest concentration of arsenic in shallot bulbs, and the ability to support optimal shallot production.
One of the pollutants on agricultural land is lead (Pb). Remediation is an effort to reduce contamination of heavy metals in agricultural soils. This study aimed to determine lead content in the soil through remediation with plus treatment. The study conducted at screen house on a pot scale using a completely randomized design with three replications and nine treatments, i.e. control/without organic fertilizer (P0), compost (P1), biochar+compost (P2), nanobiochar+compost (P3), nanobiochar+compost+consortia bacteria (P4), compost+consortia bacteria (P5), biochar+compost+consortia bacteria (P6), biochar+compost+botanical pesticide (P7) and biochar+compost+biological agents (P8). Biochar+compost (1:4) applied as basal fertilizer with dose of 2.5 t ha−1. Parameters observed were lead content in the soil at 7 DAA, 37 DAA and harvest, lead content in shallot plants (leaves and tubers) after harvest. Lead analysis used wet ashing method measured by AAS. The results showed the levels of lead metal in soil decreased from time to time except in compost treatment, while the levels of lead metal in shallots were still below of critical limit ≤ 0.5 mg kg−1. P3 treatment has potential to increase productivity while P4 and P0 could reduce lead soil higher than other treatment.
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