Research Article Availability of Phosphorus in Soil and Straw in Successive Tropical Grasses Crop Fertilized with Different Phosphates

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2 OPEN ACCESS Journal of Agronomy ISSN DOI: /ja Research Article Availability of Phosphorus in Soil and Straw in Successive Tropical Grasses Crop Fertilized with Different Phosphates 1 José Salvador Simoneti Foloni, 2 Juliano Carlos Calonego, 3 Alexandrius de Moraes rbosa, 3 Tiago Aranda Catuchi and 3 Carlos Sergio Tiritan 1 Research, Embrapa Soja, Rodovia Carlos João Strass, Distrito de Warta, Caixa Postal 231, CEP , Londrina, Paraná, Brasil 2 Departamento de Produção e Melhoramento Vegetal, Fazenda Experimental Lageado, Research, Universidade Estadual Paulista, Caixa Postal 237, CEP , Botucatu, São Paulo, Brasil 3 Departamento de Produção Vegetal, Universidade do Oeste Paulista, Rodovia Raposo Tavares, Km 572, CEP , Presidente Prudente, São Paulo, Brasil G G

3 G G G G G G G G G G G G G G G G G G G G G G G G G G

4 G G G G G G G G G G G G G G G G G G G E P -P P dose fertilizer control DRP (% = 1 G G DM DM TSP TSPEq (% = 1 fertilizer

5 Dry material of straw (g pot G (a Millet 1 Urochloa decumbens Urochloa brizantha 9 Urochloa ruziziensis 8 Dry material of straw (g pot G (b 1 (c 1 (d 9 9 Dry material of straw (g pot G Dry material of straw (g pot G G

6 Accumulation of P in straw (mg pot G (a Millet Urochloa decumbens Urochloa brizantha Urochloa ruziziensis Accumulation of P in straw (mg pot G (b (c 6 55 (d Accumulation of P in straw (mg pot G Accumulation of P in straw (mg pot G G G G G G

7 Level of p in the soil (mg kg G (a Millet Urochloa decumbens Urochloa brizantha Urochloa ruziziensis Level of p in the soil (mg kg G (b (c 1 (d 9 9 Level of p in the soil (mg kg G Level of p in the soil (mg kg G G

8 Relative availability of P in the soil (% (a Urochloa brizantha Arad Alvorada phosphorite Triple superphosphate Relative availability of P in the soil (% (b Urochloa decumbens 1 (c 1 (d Relative availability of P in the soil (% Millet Relative availability of P in the soil (% Urochloa ruziziensis G G

9 Extraction accumulated of P (mg pot G (a Millet Urochloa brizantha Urochloa decumbens Urochloa ruziziensis A A Arad A Alvorada phophorite Ab Ab Ab Triple superphosphate Ca b Control lance of input and output of P (mg pot G (b Ab A Arad b Ab Alvorada phophorite Triple superphosphate Ca Ca Ca Control Agronomic efficiency index (% (c Arad b Alvorada phophorite Triple superphosphate Equivalent triple superphosphate (% (d Arad A Alvorada phophorite Triple superphosphate G G G G

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