Evaluation of the Supply Status of NPK and some Chemical Properties in a Number of Agricultural Soils in the Ivriq Region of Ardabil

Document Type : Original Article

Authors

1 Soil Science and Engineering Department, University of Mohagege Ardabili, Ardabil. Iran

2 (M. Sc.), In Soil Fertility Management and Biotechnology, Department of Soil Science and Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

3 3Associate Professor, Department of Soil Science and Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

4 (M. Sc. ), In Soil Fertility Management and Biotechnology, Department of Soil Science and Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

10.30466/asr.2025.55487.1852

Abstract

Evaluation of soil fertility status and chemical characteristics plays a significant role in fertilizer application management, impacting the quality and quantity of products, preserving the environment and sustaining agricultural production. The objectives of this research were to evaluating the NPK status and chemical characteristics of soils in the Ivriq region of Ardabil and to prepare their zoning maps. Therefore, 100 soil samples (0-30 cm depth) were randomly collected from agricultural lands, and their geographic coordinates were recorded using GPS. After air drying and passing through sieve, important soil chemical properties such as organic carbon (Walkly & Black) and pH and electrical conductivity were measured in 1:5 soil-to-water extract. Plant available cations and phosphorus were measured using 1 N ammonium acetate and the Olsen method, respectively. Soil total nitrogen content was calculated from organic carbon data. The results showed that organic carbon and plant available phosphorus were less than 1% and 15 mg kg-1 in 76 and 71% of samples, respectively. This suggests that Ivrig soils are suffering from organic carbon and plant available phosphorus deficiency. The electrical conductivity was lower than four dS m-1 and there was no restriction in case of soil pH. The amount of plant available sodium, calcium, magnesium and potassium were within the optimal range but the ratio of sodium to potassium was 0.82, close to 1. Furthermore, the total nitrogen content in 72 % and 28 % of soils was classified as very low and low state, respectively. Based on these finding and owing to organic carbon, N and P deficiency in most parts of the region, the application of organic and chemical fertilizers containing N and P is recommended according to soil testing data for ameliorating deficiencies and sustaining production.

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References

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History

  • Receive Date: 28 July 2024
  • Revise Date: 23 November 2024
  • Accept Date: 29 November 2024

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