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Adsorption and desorption of phosphate in some semi-arid tropical Indian Vertisols

Fertilizer research volume 23, pages 87–96 (1990)Cite this article

Abstract

Adsorption and desorption of phosphorus in soils are among the key processes governing its availability to crops. There have been very few studies on the phosphorus adsorption and desorption characteristics of Vertisols. The P adsorption and desorption characteristics of four Vertisols belonging to three agriculturally important soil series were studied. The amounts of P adsorbed by the soils at 0.2µg ml−1 equilibrium solution P concentration was low and ranged from 34.3 to 79.5µg g−1 soil. The phosphate adsorption was very well described by Langmuir and Freundlich isotherms. The P adsorbed by a Vertisol (BR-1) fertilized with different rates of P in the previous season (0, 10, 20 and 40 kg P ha−1) was similar (34.3–41.3µg g−1 soil) indicating little effect of fertilization on P adsorption. The correlation studies indicated that the DTPA-extractable Fe was the most important factor accounting for P adsorption in these soils. Clay and CaCO3 content were found to be relatively less important factors affecting P adsorption in the soils studied.

The capacity of the two extractants and EUF (electro-ultrafiltration) to desorb the adsorbed P followed the order: EUF (400V, 80°C)>sodium bicarbonate>EUF (200V, 20°C)>calcium chloride. The average amounts of P desorbed from the four Vertisols using these methods were 74, 63, 50, and 3% respectively of the adsorbed P. In the Begamganj soil, the amount of P desorbed by EUF (400V, 80°C) exceeded 100%, indicating that all of the adsorbed P was desorbable including some native P.

In conclusion the results of our study show that the Vertisols studied have low phosphate adsorption capacity and that the P they adsorbed is easily desorbable.

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Authors and Affiliations

  1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), ICRISAT Patancheru P.O., A.P. 502 324, India

    S. Shailaja & K. L. Sahrawat

Authors
  1. S. Shailaja
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  2. K. L. Sahrawat
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Approved for publication as Journal Article No. 983 by International Crops Research Institute for the Semi-Arid Tropics (ICRISAT).

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Shailaja, S., Sahrawat, K.L. Adsorption and desorption of phosphate in some semi-arid tropical Indian Vertisols. Fertilizer Research 23, 87–96 (1990). https://doi.org/10.1007/BF01063335

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  • DOI: https://doi.org/10.1007/BF01063335

Key words

  • Adsorption
  • desorption
  • extractable P
  • soil characteristics and P adsorption
  • P buffering capacity
  • electro-ultra filtration (EUF)

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