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• W2621162099 abstract "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 ( 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." @default.
• W2621162099 created "2017-06-09" @default.
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• W2621162099 date "2017-05-01" @default.
• W2621162099 modified "2023-10-08" @default.
• W2621162099 title "Can Edaphic Variables Improve DTPA-Based Zinc Diagnosis in Corn?" @default.
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• W2621162099 doi "https://doi.org/10.2136/sssaj2016.09.0316" @default.
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