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Soybean response glycine max to doses and sources of phosphorus



Soybean response glycine max to doses and sources of phosphorus



Agronomia Sulriograndense 17(1): 85-88



A field experiment was conducted on Rio Pardo soil (Paleudult) at Taquari. Rio Grande do Sul. Brazil. For a period of 4 yr. The main objective was to evaluate the agronomic efficiency of Gafsa and Rhenania phosphates compared to triple superphosphate. Six rates of P were used: 0.60, 120, 180, 240 and 480 kg/ha of total P2O5. There was an increasing response on grain yield to rates of P; no significant differences on sources of P were observed on 3 soybean croppings. The agronomic efficiency of triple superphosphate was higher than Gafsa and Rhenania phosphates on low levels of P in the soil. N and P content in soybean tissue increased with increasing fertilizer dose. Available P estimated by the North Carolina Method decreased in the soil after the 2nd yr. The rate of decreasing was higher when triple superphosphate or Rhenania phosphate were used.

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Accession: 006451402

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