eprintid: 3974
rev_number: 7
eprint_status: archive
userid: 17
dir: disk0/00/00/39/74
datestamp: 2011-11-17 03:35:40
lastmod: 2011-11-17 03:35:40
status_changed: 2011-11-17 03:35:40
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
item_issues_count: 0
creators_name: Shailaja, S
creators_name: Sahrawat, K L
icrisatcreators_name: Shailaja, S
icrisatcreators_name: Sahrawat, K L
affiliation: ICRISAT(Patancheru)
country: India
title: Adsorption and desorption of phosphate in some semi-arid tropical indian vertisols
ispublished: pub
subjects: s2.11
full_text_status: public
abstract: 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 0.2 μg/ml equilibrium solution P concn was low and ranged from 34.3 to 79.5 μg/g 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) was similar (34.3-41.3) 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 and clay and CaCO3 content were relatively less important. 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% resp. 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. The results show that the Vertisols studied have low phosphate adsorption capacity and that the P they adsorbed is easily desorbable
date: 1990
date_type: published
publication: Fertilizer Research
volume: 23
number: 2
publisher: Kluwer Academic Publishers
pagerange: 87-96
refereed: TRUE
issn: 0167-1731
official_url: http://dx.doi.org/10.1007/BF01063335
related_url_url: http://scholar.google.co.in/scholar?as_q=Adsorption+and+desorption+of+phosphate+in+some+semi-arid+tropical+indian+vertisols&num=10&btnG=Search+Scholar&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&as_sdt=1.&as_sdtp=on&as
related_url_type: author
citation:   Shailaja, S and Sahrawat, K L  (1990) Adsorption and desorption of phosphate in some semi-arid tropical indian vertisols.  Fertilizer Research, 23 (2).  pp. 87-96.  ISSN 0167-1731     
document_url: http://oar.icrisat.org/3974/1/FertilizerRes_23_2_87-96_1990.pdf