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Effect of Banded and Broadcast Placement of Cu Fertilizers on Correction of Cu Deficiency¹

Preliminary investigations on the organic soils (Histosols) in northern Minnesota indicated that Cu was the main limiting factor for small grain production, especially for hard red spring wheat (Triticum aestivum L.). Yield increases of 2,240 kg/ha were obtained with Cu applied. The experiments in this study were conducted to determine the affect of Cu carrier, Cu rate, and their placement on grain yield of hard red spring wheat. Five experiments were conducted during the 1977 and 1978 growing seasons on two organic soil series, Brophy and Cathro. The treatments consisted of placement comparisons of broadcast vs banded applications of CuSO₄·5H₂O and Cu chelate (5% Cu) derived from Cu HEDTA at various rates. A control plot with no Cu applied was also included in the treatments. Grain was harvested at maturity and the yields were determined. Severe Cu deficiency was observed in all five experiments and significant responses to Cu were obtained. The response obtained was dependent upon the carrier, rate, and placement. The most significant finding was that the broadcast application of CuSO₄ worked extremely well, but when banded it did not correct the Cu deficiency. The effectiveness of both Cu carriers and the rate of Cu needed varied widely and depended mainly on the method of application and specifically the amount of incorporation.

Key Words: Copper sulfate pentahydrate (CuSO₄·5H₂O • Copper chelate (Cu HEDTA) • Spring wheat (Triticum aestivum L.) • Organic soils

² Assistant professor, Northwest Exp. Stn., Univ. of Minnesota, Crookston, MN 56716.

Received for publication April 22, 1982.