Journal
JOURNAL OF PLANT NUTRITION
Volume 44, Issue 4, Pages 486-497Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2020.1844754
Keywords
agronomic biofortification; micronutrients; soil fertility
Categories
Funding
- Instituto Nacional de Tecnologia Agropecuaria-Proyecto Nacional Suelo [2019-PE-E1-l011-001]
- Fondo para la Investigacion Cientifica y Tecnologica [PICT 2017-0757]
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Different zinc application strategies were evaluated for their impact on maize grain yield and grain zinc concentration in Mollisols with varying soil zinc availability and pH levels. Soil zinc and foliar zinc were found to be more suitable strategies in scenarios of very low soil zinc availability, while grain zinc concentration was not significantly affected by the application strategies.
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 x GY + 9.62 x Zn-DTPA (R-2 = 0.38).
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