info:eu-repo/semantics/article
Effect of zinc application strategies on maize grain yield and zinc concentration in mollisols
Fecha
2020-11Registro en:
Martínez Cuesta, Nicolás; Carciochi, Walter Daniel; Sainz Rozas, Hernan Rene; Salvagiotti, Fernando; Colazo, Juan Cruz; et al.; Effect of zinc application strategies on maize grain yield and zinc concentration in mollisols; Taylor & Francis; Journal of Plant Nutrition; 44; 4; 11-2020; 486-497
0190-4167
CONICET Digital
CONICET
Autor
Martínez Cuesta, Nicolás
Carciochi, Walter Daniel
Sainz Rozas, Hernan Rene
Salvagiotti, Fernando
Colazo, Juan Cruz
Wyngaard, Nicolás
Eyherabide, Mercedes
Ferraris, Gustavo Nestor
Barbieri, Pablo Andres
Resumen
Maize (Zea mays L.) is highly susceptible to zinc (Zn) deficiency. Different application strategies (AS) can be utilized to improve grain yield (GY) and quality (Zn biofortification) by combining Zn fertilizer rate, source, timing, and placement techniques. This study aimed to evaluate whether different Zn-AS (soil, seed, and foliar) affect maize GY and grain Zn concentration in Mollisols with contrasting soil Zn availability and pH. Five site-years field experiments were carried out. Treatments (Zn-AS) were compared to a control, and included: seed-Zn, 0.3 kg Zn ha−1; foliar-Zn, 0.7 kg Zn ha−1 at V6 stage; and soil-Zn, 2.1 kg Zn ha−1 surface banded. Zinc fertilization increased GY (response ranged from 892 to 2519 kg ha−1) in four of five sites (p < 0.05). The evidence indicates that in scenarios of very low soil Zn availability (<0.9 mg kg−1 Zn-DTPA) greater Zn rates are required, and therefore soil-Zn and foliar-Zn are the more suitable AS. Grain Zn concentration ranged from 19.5 to 43.1 mg kg−1 and was not affected by Zn-AS. At all sites, even those showing GY response to Zn fertilization, grain Zn concentration in the control treatment was above the sufficiency threshold for maize GY (18 mg kg−1), indicating that this threshold needs to be updated for the current maize hybrids. Grain Zn concentration was predicted by the model: grain Zn concentration = 39.56 − 0.002 × GY + 9.62 × Zn-DTPA (R2 = 0.38).