Abstract
In agriculture, chelating agents are used to supplement micronutrients, such as iron (Fe). However, little research has been conducted at the field-scale level to evaluate chelating agent effects on phosphorus (P). The objectives of this study were to evaluate three commercially available chelated Fe sources on early soybean growth and nutrient uptake. The study was conducted at six locations in 2014 and 2015. The experimental design was a randomized, complete block with a factorial treatment arrangement. The two factors included fertilizer source and fertilizer placement. The fertilizer sources were P only, EDTA-Fe, HEDTA-Fe, and one glucoheptonate product, Cee*Quest N5Fe758 (CQ-758), with two fertilizer placements, in-furrow with seed contact and surface band at planting. Results show soybean yield was affected by chelate source and placement. Greater yields occurred with application in-furrow at Scandia in 2014 and 2015, but in-furrow was superior at Rossville in 2015. Increased yields also occurred with applications of EDTA and HEDTA. However, further analysis of tissue and grain may show chelate effects on nutrients.
Highlights
Increasing yield with the application of chelated micronutrients has been studied extensively since the 1920s
Little research has been conducted at the field-scale level to evaluate chelating agent effects on phosphorus (P)
Results show soybean yield was affected by chelate source and placement
Summary
Increasing yield with the application of chelated micronutrients has been studied extensively since the 1920s. A soil incubation study observing the effects of chelates on plant available P resulted in increased P with the application of EDTA and HEDTA (Edwards et al, 2013). Increasing chelating agent application rate was found to increase soil test P for EDTA and HEDTA (r2=0.86 and 0.95) in a soil with high P adsorption capacity. This increase in P was attributed to EDTA binding Fe within soil colloids and decreasing the P adsorption capacity of the soil (van der Zee and van Riemsdijk, 1988)
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