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- W2913202434 abstract "Abstract The efficient use of phosphorus (P) in agriculture should rely on accurate soil P tests ( SPT ). Organic P contributes to P supply to plants; however, it is not usually taken into account in assessing P fertilizer requirements. We hypothesized that there would be an increased accuracy of bicarbonate extraction as SPT in predicting P uptake by plants if total P ( TP ) in this soil extract is taken into account. We conducted a soil P depletion experiment with 36 soils involving four consecutive crops in pots. Molybdate‐reactive P ( MRP ) and total P were determined in extracts centrifuged at 19,000 g (Bic‐ MRP C and Bic‐ TP C ) or not (Bic‐ MRP and Bic‐ TP ). MRP in extracts explained <47% of the variance in the cumulative P uptake, while total P (centrifuged at 19,000 g or not) provided the most accurate estimation of P uptake (59% with Bic‐ TP ) and threshold values for fertilizer response ( R 2 = 0.58 with Bic‐ TP c). When soils were separated in two groups according to their Ca carbonate equivalent to clay ratio, the variance in the cumulative P uptake explained by Bic‐ MRP was above 63%, and that explained by Bic‐ TP was above 73%. This separation also enabled more realistic estimation of the threshold values for fertilizer response. It can be concluded that the use of total P instead of MRP in bicarbonate extraction was promising in terms of improving its accuracy in assessing P fertilizer requirements." @default.
- W2913202434 created "2019-02-21" @default.
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- W2913202434 date "2019-04-12" @default.
- W2913202434 modified "2023-10-16" @default.
- W2913202434 title "The determination of total phosphorus improves the accuracy of the bicarbonate extraction as an availability index" @default.
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- W2913202434 doi "https://doi.org/10.1111/sum.12498" @default.
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