0918
Secondary and micronutrient uptake, partitioning, and removal across a wide range of soybean seed yield levels
Adam P. Gaspar; Carrie A.M. Laboski; Seth L. Naeve; Shawn P. Conley
Original research article
Field experiment
Soybean
Boron
Copper
Iron
Manganese
Zinc
View source document
year
2018
Country
United States
Abstract

Reduced atmospheric S deposition, in conjunction with higher grain sale prices and steadily increasing yields of soybean [Glycine max (L.) Merr.], has many growers considering an increase in secondary and micronutrient applications. Limited information exists quantifying requirements of S, Mg, Ca, Zn, Mn, Cu, Fe, and B across a wide yield range for modern soybean production systems. Using six site-years and eight varieties, plants were sampled at six growth stages and partitioned into their respective plant parts and analyzed. Nutrients were acquired heavily (48-73%) from R1 through R5.5 with peak uptake rates near R3. Yet, uptake after R5.5 represented a greater portion of total S uptake as yield increased from the low (24.9%) to high (32.2%) yield level (3608 vs. 5483 kg ha-1). This coincided with seed S accumulation, which relied more heavily on continued uptake after R5.5 (58%) vs. vegetative S remobilization (42%). Across all environments (site × year) and varieties, total S uptake (0.004 kg S kg grain-1) and removal (0.003 kg S kg grain-1) showed moderate (R2=0.58) and strong (R2=0.76) relations with yield, respectively. These relations for each micronutrient were much weaker (R2=0.13-0.66), due largely to the main effects of environment and variety along with their respective interactions with yield. Furthermore, micronutrient concentrations in leaf tissue varied considerably (CV=28-46%) during recommend testing stages. Thus, previously reported inconsistent yield responses to foliar application of these micronutrients may primarily be due to the large variability in leaf tissue concentrations and nutrient requirements.

Keywords

soybean; zinc; manganese; copper; iron; boron; sulfur; uptake; partitioning; removal; tissue testing; foliar response variability

Outcomes reported
Biomass
Soil properties
Nutrient uptake
Soil properties
Yield
Synthesis
Key insight
Across Wisconsin and Minnesota environments, soybean micronutrient uptake and removal varied with yield, environment, and variety, while late-season sulfur uptake became more important at higher yield.
Limitations
This study quantified uptake across environments rather than testing a direct micronutrient fertilizer treatment.
Welland | Ontario | Canada‍
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