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There is strong interest on recovering nutrients from waste stream of industrial processing of crop biomass for bioenergy so it can be efficiently utilized as a fertilizer material. The objective of this study was to evaluate at the field the P availability for corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] of P recovered as struvite (NH4MgPO4.6H2O) from the aqueous stream of corn fiber processing for bioenergy. Trials were established at three Iowa locations with different soil series. Soil-test P (STP) was low (8 to 12 mg kg -1 Bray-1 P, 15-cm depth) and pH was 5.5 to 6.4. Each trial was evaluated for three years, with corn the first year, soybean the second, and corn the third. Treatments were 0, 12, 24, 36, 48, 72, and 120 kg P ha -1 as granulated struvite or triple superphosphate (TSP) P sources, which were broadcast and incorporated into the soil only once before the first corn crop. Measurements were corn aboveground dry matter accumulation (DW), P concentration, and P uptake at the V6 growth stage only the first year; grain yield, P concentration, and P accumulation; and post-harvest STP each year by the Bray-1, Mehlich-3 (M3), and Olsen tests. There were very large P rate

Field evaluation of the availability for corn and soybean of phosphorus recovered as struvite from corn fiber processing for bioenergy