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Determination of threshold value of iron in soils and plants for the response of rice and lentil to iron application in calcareous soil

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Summary

In a pot experiment with 26 calcareous soils, the critical limit of Fe in soils and plants was evaluated. DTPA-extractable Fe was found significanty correlated with Bray's per cent yield in rice. The Fe2+ (iron) in rice and lentil was also found significantly correlated with DTPA-extractable Fe as well as Bray's per cent yield showing thereby the superiority of Fe2+ (iron) in leaves over DTPA-extractable soil Fe to differentiate Fe responsive soils from non-responsive ones. The total Fe content in plant tissues does not seem correlated with the occurrence of Fe deficiency. The threshold values of DTPA-extractable soil Fe and Fe2+ (iron) in rice and lentil leaves were 6.95, 44 and 74.5 ppm, respectively below which appreciable responses to Fe application were observed. The optimum Fe level for these soils was found to be 10 ppm in which the dry matter yield response in all the 19 rice soils and 16 lentil soils ranged from 14.28 to 56.16 (Av. 25.75%) and 13.31 to 53.97 (Av. 22.47%), respectively.

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Authors and Affiliations

  1. Department of Soil Science and Agricultural Chemistry, College of Agriculture, Rajendra Agricultural University, Pusa, Samastipur, Bihar, India

    R. Sakal, B. P. Singh & A. P. Singh

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  1. R. Sakal
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  2. B. P. Singh
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  3. A. P. Singh
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Sakal, R., Singh, B.P. & Singh, A.P. Determination of threshold value of iron in soils and plants for the response of rice and lentil to iron application in calcareous soil. Plant Soil 82, 141–148 (1984). https://doi.org/10.1007/BF02220778

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  • DOI: https://doi.org/10.1007/BF02220778

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