0224
Corn era hybrid nutrient concentration and accumulation of secondary and micronutrients
Krishna P. Woli; John E. Sawyer; Matthew J. Boyer; Lori J. Abendroth; Roger W. Elmore
Original research article
Field experiment
Corn
Boron
Copper
Iron
Manganese
Zinc
View source document
year
2019
Country
United States
Abstract

Studies are limited that focus on change in concentration and accumulation of secondary and micronutrients in corn (Zea mays L.) plant fractions and across corn hybrid development periods. This research was conducted in 2007 and 2008 to evaluate the partitioning of secondary and micronutrients across vegetative and reproductive stages at the plant-fraction level for 1960- and 2000-era hybrids. Two popular hybrids for each era were grown, with measurement of nutrient concentration and content in several plant and grain fractions. Secondary and micronutrient concentrations in plant fractions were lower in 2000- than 1960-era hybrids with most nutrients, except ear shoots and tassels for certain nutrients. However, nutrient content was consistently greater in 2000- compared to 1960-era hybrids in the whole plant and fractions at most development stages, except tassels and ear shoots. In tassels, nutrient content was mostly smaller in 2000-era hybrids, but in ear shoots content was similar. The accumulation rates of most nutrients per growing degree day (GDD) were greater in the reproductive period for 2000-era hybrids, but similar among eras in the vegetative period. Remobilized nutrients from vegetative to reproductive components were similar between era hybrids, except Ca and Fe, and positive except Fe, Mn, and B. It is apparent that greater nutrient content in newer hybrids was driven mainly by associated nutrient uptake rates and greater dry matter (DM). Despite the greater nutrient content with the modern hybrids, removal with grain or stover harvest would still be small for S and micronutrients.

Keywords

corn; hybrid era; calcium; magnesium; sulfur; iron; copper; zinc; manganese; boron; nutrient accumulation; plant fractions; V6-R6; Iowa

Outcomes reported
Biomass
Soil properties
Nutrient uptake
Soil properties
Synthesis
Key insight
Modern 2000-era corn hybrids had lower micronutrient concentrations but generally greater whole-plant and grain micronutrient content and accumulation than 1960-era hybrids because of greater dry matter and uptake.
Limitations
Two-year Ames field comparison of four Pioneer hybrids evaluated nutrient partitioning across era classes without direct micronutrient treatments, explicit organic-matter data, or economic analysis.
Welland | Ontario | Canada‍
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