Can edaphic variables improve DTPA-based zinc diagnosis in corn?

BARBIERI, PABLO A.; SAINZROZAS, HERNÁN R.; WYNGAARD, NICOLÁS; EYHERABIDE, MERCEDES; CALVO, NAHUEL I. REUSSI; SALVAGOTTI, FERNANDO; CORRENDO, ADRIÁN A.; BARBAGELATA, PEDRO A.; ESPÓSITO GOYA, GABRIEL P.; COLAZO, JUAN C.; ECHEVERRIÁ, HERNÁN E.

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL

SOIL SCI SOC AMER

Año: 2017 vol. 81 p. 556 - 563

0361-5995

Current zinc (Zn) diagnostic methods for corn (Zea mays L.) are often based on soil DTPA (diethylenetriamine-pentaacetic acid) extractable Zn (DTPA-Zn). However, calibration of the DTPA-Zn test may be influenced by other soil properties such as pH, organic matter (SOM) and available Bray-P (PBray-1). Our objective was to assess the contribution of soil properties to a DTPA-Zn model used to predict corn response to Zn fertilization. We conducted 64 field trials with two Zn-fertilization treatments: With and without Zn fertilization. In all sites, we measured SOM, PBray-1, pH, and DTPA-Zn at 0-to 20-cm depth before sowing. Yield difference between Zn-fertilized and unfertilized treatments (Ydifference) was significant in 33% of the experimental site-years. In responsive site-years, the average Ydifference was 0.98 Mg ha-1 (11.4%). Soil organic matter was the only property that was a significant addition to the DTPA-Zn model for predicting the corn relative yield (Model R2 including SOM = 0.27). However, the improvement was nominal (Partial R2 of SOM = 0.06). Use of DTPA-Zn alone was suitable to discriminate Zn responsiveness among site-years based on the Ydifference by correctly diagnosing 81% of the outcomes. We determined three soil DPTA-Zn ranges with different probability of resulting in a Ydifference greater than zero when fertilized with Zn: High (<0.9 mg kg-1), medium (0.9-1.3 mg kg-1), and low (>1.3 mg kg-1). These soil-test-based Zn recommendations improve the identification of Zn-deficient soils allowing prevention of yield loss from Zn deficiency and more rational use of Zn fertilizers.