Phosphorus sources residual effects on Tifton 85 production and nutritive value cultivated in a tropical weathered soil¹

  • Henrique Coutinho Junqueira Franco Universidade Estadual Paulista
  • Bernardo Melo Montes Nogueira Borges Centro Brasileiro de Pesquisa em Energia e Materiais
  • Sergio Gustavo Quassi de Castro Centro Brasileiro de Pesquisa em Energia e Materiais
  • Michele Xavier Vieira Megda Universidade de São Paulo
  • Marcio Mahmoud Megda Universidade de São Paulo
  • Alan L. Garside James Cook University
  • Edson Luiz Mendes Coutinho Universidade Estadual Paulista
Keywords: Pasture, phosphate rock, critical level, bermudagrass

Abstract

Acid reactions and low available phosphorus in tropical soils limit forage yield. The aim was to evaluate soil chemical characteristics pH, P and Mg, forage nutritive values, critical soil and plant P levels and the residual effect of each source. The experiment was in a greenhouse with a Rhodic Haplustox, loam texture. Experimental design was a 5 x 4 factorial with five replicates which phosphate fertilizers were triple superphosphate, reactive rock phosphates Gafsa and Arad, and fused magnesium phosphate powder and coarse, applied at rates of 30, 60, 90 and 120 mg kg-1 P and a control treatment without P. The effectiveness of rock phosphates increased due to their residual effect. The coarse fused magnesium phosphate resulted in the lowest efficiency. The P critical level in soil and plant were 18 mg kg-1 and 2.4 g kg-1, respectively. The increase of phosphorus rates provided an increase in crude protein content.

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Published
2020-04-13
How to Cite
Coutinho Junqueira Franco, H., Melo Montes Nogueira Borges, B., Gustavo Quassi de Castro, S., Megda, M. X. V., Megda, M. M., Garside, A. L., & Luiz Mendes Coutinho, E. (2020). Phosphorus sources residual effects on Tifton 85 production and nutritive value cultivated in a tropical weathered soil¹. Bioscience Journal , 36(3), 968-975. https://doi.org/10.14393/BJ-v36n3a2020-42626
Section
Agricultural Sciences