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Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger

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Relation http://oar.icrisat.org/7097/
http://dx.doi.org/10.2136/sssaj1990.03615995005400060045x
 
Title Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger
 
Creator Chien, S H
Henao, J
Christianson, C B
Bationo, A
Mokwunye, A U
 
Subject Millets
 
Description 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
 
Publisher Soil Science Society of America
 
Date 1990
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/7097/1/SSSA_54_6_1772-1777_1990.pdf
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