Resumo

ALVAREZ, Jimmy Walter Rasche et al. Availability of iron in soils of the Eastern region of Paraguay. Rev. Soc. cient. Parag. [online]. 2022, vol.27, n.1, pp.49-60. ISSN 2617-4731.  https://doi.org/10.32480/rscp.2022.27.1.49.

Abstract: Iron (Fe) is a micronutrient required by plants, and there are few studies related to its availability in Paraguayan soils, so it is important to know its availability and distribution. The objective of the research was to evaluate and classify the availability of Fe in soils of the Eastern region of Paraguay at the district level. For this, a database was generated with the results of soil analysis from the FCA-UNA, CIHB-IPTA and FUCAI-UCA laboratories. The available Fe content of the soils of 11,436 samples was classified as "high" (>12 mg kg-1); “medium” level (4 - 12 mg kg-1) and “low” level (<4 mg kg-1), generating a Cu availability map at the district level. Descriptive statistics were performed based on the available Fe values. Of the 234 districts that make up the Eastern region of Paraguay, 82% presented a "high" level of Fe (192 districts), 1% had a "medium" level of Fe (2 districts), and 17% were not classified due to lack of data. The department with the highest average value of available Fe was Itapúa with 106.6 mg kg-1 and the lowest average value of available Fe was Amambay with 23.1 mg kg-1. Considering the total number of soil samples analyzed, 10,160 samples had "high" levels of Fe, 1,084 samples had "medium" levels of Fe, and 192 samples had "low" levels of Fe. The soils of the Eastern region present a predominance of soils with high availability of Fe, ideal for agricultural, livestock and forestry production systems.

Palavras-chave : micronutrient; soil iron level; trace elements; heavy metals.

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