Artículo
Can edaphic variables improve DTPA-based zinc diagnosis in corn?
Barbieri, Pablo Andres
; Sainz Rozas, Hernan Rene
; Wyngaard, Nicolás
; Eyherabide, Mercedes; Reussi Calvo, Nahuel Ignacio
; Correndo, Adrián A.; Barbagelata, Pedro A.; Espósito Goya, Gabriel P.; Colazo, Juan Cruz; Echeverria, Hernan Eduardo
Fecha de publicación:
06/2017
Editorial:
Soil Science Society of America
Revista:
Soil Science Society of America Journal
ISSN:
0361-5995
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Corn
,
Zn
,
Fertilization
,
Dtpa
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Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Citación
Barbieri, Pablo Andres; Sainz Rozas, Hernan Rene; Wyngaard, Nicolás; Eyherabide, Mercedes; Reussi Calvo, Nahuel Ignacio; et al.; Can edaphic variables improve DTPA-based zinc diagnosis in corn?; Soil Science Society of America; Soil Science Society of America Journal; 81; 3; 6-2017; 556-563
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