Degree Type

Thesis

Date of Award

2013

Degree Name

Master of Science

Department

Agronomy

First Advisor

Antonio P. Mallarino

Abstract

FIELD EVALUATION OF THE AVAILABILITY FOR CORN AND SOYBEAN OF PHOSPHORUS RECOVERED AS STRUVITE FROM CORN FIBER PROCESSING FOR BIOENERGY

A paper to be submitted to Soil Science Society of America Journal

Louis B. Thompson and Antonio P. Mallarino

ABSTRACT

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

DOI

https://doi.org/10.31274/etd-180810-3234

Copyright Owner

Louis Bernard Thompson

Language

en

File Format

application/pdf

File Size

57 pages

Included in

Soil Science Commons

Share

COinS