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Agronomic Efficiency Of Different Types Of LIME and Sources Of Phosphorus In Brazilian Cerrado SOILS Cultivated With Soybean.

Poster Number 2328

Wednesday, November 6, 2013
Tampa Convention Center, East Hall, Third Floor

Adônis Moreira, Soil Science, Embrapa Soybean, Londrina, Brazil, Larissa Alexandra Cardoso Moraes, Plant Physiology, Embrapa Soybean, Londrina, Brazil, Nand Kumar Fageria, Soil Science, Embrapa Rice and Bean, Santo Antonio de Goias, Brazil and Bruna Wurr Rodak, Soil Science, Federal University of Paraná, Curitiba, Brazil
<>With the increase in phosphate fertilizer prices, there is a need to find lower-cost alternatives that are as efficient as soluble sources like single (SSP) and triple superphosphate (TSP). To assess the efficiency of sources of P and two types of lime on soybean yield, an experiment was carried out with dystrophic Red Latosol (Oxisol). The experimental design was randomized blocks in a 2×3×4 factorial scheme, with four replicates. The treatments were: two types of lime [calcitic – CL (<5 dag kg-1 of MgO) and dolomitic – DL (>13 dag kg-1 of MgO)], three sources of P [triple superphosphate (TSP), ‘Yoorin' thermalphosphate (YT) and ‘Experimental' thermalphosphate (ET)], and four rates of P2O5 (0, 100, 200 and 300 kg ha-1). The application of DL resulted in higher soybean yields than the application of CL. Two lime types influenced the pH, carbon (C), calcium (Ca) and magnesium (Mg) concentrations as well as the Ca/Mg, Ca/K and Mg/K ratios in the soil. With respect to sources of P, the YT applied in the soil with DL produced an agronomic efficiency index (AEI) similar to that of TSP, while in the soil with CL, the TSP, YT and ET were similar, with maximum technical efficiency (MTE) under both conditions starting at 230 kg ha-1 of P2O5. The critical concentration of available P in the soil (Mehlich-1 extractant) for cultivation of soybean under the climate and soil conditions was between 5.0 and 6.0 mg kg-1.

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Phosphorus and Potassium Soil Fertility and Management

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