<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger"^^ . "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"^^ . "1990" . . "54" . "6" . . "Soil Science Society of America"^^ . . . "Soil Science Society of America Journal"^^ . . . "03615995" . . . . . . . . . . . . . . . . . . . "A U"^^ . "Mokwunye"^^ . "A U Mokwunye"^^ . . "C B"^^ . "Christianson"^^ . "C B Christianson"^^ . . "A"^^ . "Bationo"^^ . "A Bationo"^^ . . "J"^^ . "Henao"^^ . "J Henao"^^ . . "S H"^^ . "Chien"^^ . "S H Chien"^^ . . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (PDF)"^^ . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (Other)"^^ . . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (Other)"^^ . . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (Other)"^^ . . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (Other)"^^ . . . . . . "Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger (Other)"^^ . . . . . "HTML Summary of #7097 \n\nAgronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger\n\n" . "text/html" . . . "Millets"@en . .