eprintid: 7097
rev_number: 10
eprint_status: archive
userid: 19
dir: disk0/00/00/70/97
datestamp: 2013-09-12 11:03:54
lastmod: 2013-09-20 05:08:55
status_changed: 2013-09-12 11:03:54
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
creators_name: Chien, S H
creators_name: Henao, J
creators_name: Christianson, C B
creators_name: Bationo, A
creators_name: Mokwunye, A U
icrisatcreators_name: Bationo, A
affiliation: International Fertilizer Development Center(Alabama)
affiliation: ICRISAT(Niamey)
affiliation: IFDC-Africa(Lome)
country: USA
country: Niger
country: Togo
title: Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger
ispublished: pub
subjects: S1.5
full_text_status: restricted
abstract: A field study was conducted on a sandy soil in Niger to evaluate the agronomic effectiveness of various P fertilizers for millet production during 1985 to 1987. The P fertilizers tested were two finely ground phosphate rocks (PR) indigenous to Niger (Tahoua and Parc W rocks), PR partially acidulated with H2SO4 at 50% acidulation level (PAPR), single superphosphate (SSP), and triple superphosphate (TSP). In 1985, application rates were 0, 6.5, 13.0, and 19.5 kg P ha−1 for each of the P fertilizers. In 1986, half of the plots received the same rates of P as in 1985 and half of the plots received no additional P. In 1987, P additions were repeated only in half of the plots that received P during 1986. A significant (P = 0.05) millet response to P was observed in all the trials. The major findings of this study were: (i) finely ground Tahoua PR was more effective than Parc W PR because of its higher reactivity and was 82 to 91% as effective as SSP for millet production in both the initial and two subsequent seasons; (ii) partial acidulation of Parc W PR can significantly increase its agronomic effectiveness in the first year, but not in terms of residual effect; (iii) partial acidulation was not a desirable technology for increasing the effectiveness of Tahoua PR, because its high Fe2O3 plus Al2O3 content resulted in a product containing relatively low amounts of water-soluble P; and (iv) over a period of 3 yr, one initial application of a large dose of P fertilizer was found to be more effective than three small annual applications in terms of total grain production
date: 1990
date_type: published
publication: Soil Science Society of America Journal
volume: 54
number: 6
publisher: Soil Science Society of America
pagerange: 1772-1777
refereed: TRUE
issn: 0361-5995
official_url: http://dx.doi.org/10.2136/sssaj1990.03615995005400060045x
related_url_url: http://scholar.google.co.in/scholar?as_q=Agronomic+Evaluation+of+Two+Unacidulated+and+Partially+Acidulated+Phosphate+Rocks+Indigenous+to+Niger&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&btnG=&hl=en&as_sdt=0%2C5
related_url_type: pub
citation:   Chien, S H and Henao, J and Christianson, C B and Bationo, A and Mokwunye, A U  (1990) Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger.  Soil Science Society of America Journal, 54 (6).  pp. 1772-1777.  ISSN 0361-5995     
document_url: http://oar.icrisat.org/7097/1/SSSA_54_6_1772-1777_1990.pdf