Influence of phosphate rock sources and rates on rice and common bean production in an Oxisol |
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Authors: | N K Fageria V C Baligar R J Wright |
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Institution: | (1) National Rice and Bean Research Center of EMBRAPA, Caixa Postal 179, 74001 Goiania, GO, Brazil;(2) Appalachian Soil and Water Conservation Research Laboratory, 25802-0867 Beckley, WV, USA |
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Abstract: | A field experiment was conducted for five consecutive years to determine upland rice (Oryza sativa L.) and common bean (Phaseolus vulgaris L.) response to eight P sources at three P rates in an Oxisol of Central Brazil. The P sources tested were triple superphosphate
(TSP), Arafertil phosphate partially acidulated (APPA), phosphate of Patos partially acidulated (PPPA), phosphate of Araxa
concentrated (PAC), phosphate of Catalao (PC), phosphate of Jacupiranga (PJ), phosphate of Patos de Minas (PPM), and phosphate
of Abaete (PA). All phosphate rock sources were of Brazilian origin. The P rates used were 87, 174 and 262 kg P ha-1. Yield response to P sources and rates varied from crop to crop. Rice and bean yields were significantly correlated with
Bray 1 P, but not Mehlich 1 P. In the first year, TSP and the two partially acidulated phosphate rocks (APPA, PPPA) produced
higher grain yields. In the second year and all remaining years of the experiment, the efficiency of phosphate rock sources
as measured by grain yield was equivalent to TSP or partially acidulated P sources. The results suggest that these phosphate
rock sources could be used in rice-bean rotations on Brazilian Oxisols. Yield losses in the first year could be partially
offset by the addition of a small amount of soluble P. |
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Keywords: | Bray 1 extractant Mehlich 1 extractant Oryza sativa L P concentration P uptake Phaseolus vulgaris L |
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