Abstract

HERNANDEZ, Carlos F. et al. Effect of different phosphorus fertilization alternatives on available soil phosphorus concentration and yields in a soybean - wheat cropping system in Tucumán, Argentine. Rev. ind. agric. Tucumán [online]. 2009, vol.86, n.2, pp.31-36. ISSN 1851-3018.

Ten phosphorus fertilization alternatives were evaluated in a soybean-wheat cropping system in La Ramada de Arriba (Burruyacú, Tucumán province). The study was carried out on a Typic Argiudoll, with 3.5% organic matter and 7.8 ppm phosphorus (P-Bray 1). The objective of this trial was to estimate the effect of each fertilization alternative on available phosphorus concentration in two soil layers, 0-5 cm and 5-25 cm, over five years (from 2002 to 2007), and on soybean and wheat yields. Evaluated treatments consisted in applying 30, 45 and 60 kg P₂O₅/ha as triple superphosphate yearly only to soybean, only to wheat and to both crops. P residual effect was found for both crops when 45 kg P₂O₅/ha was applied. Available soil phosphorus concentration increased over 13 ppm (critical P-Bray 1 concentration for soybean) when 45 and 60 kg P₂O₅/ha rates were applied to both crops, reaching at the same time the highest residual phosphorus uptake efficiency. Soybean yields were higher when P was applied to soybean, as compared to wheat treated with the same P rates. Soybean highest P uptake efficiency was found when P was applied to soybean.

Keywords : Phosphorous; Dose; Residuality; Soil analysis.

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