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Production Papers

Seed Priming Does Not Improve Corn Yield in a Humid Temperate Environment

Eastern Cereal and Oilseed Res. Cent. (ECORC), Cent. Exp. Farm, Res. Branch, Agric. and Agri-Food Canada, 960 Carling Ave., Ottawa, ON, Canada, K1A 0C6

^* Corresponding author (subedik{at}agr.gc.ca)

Received for publication May 10, 2004. Early emergence and stand establishment of corn (Zea mays L.) is considered to be one of the most important yield-contributing factors in eastern Ontario. A pot experiment and two field experiments were conducted in Ottawa, Canada, to evaluate the effects of seed priming with water, osmotic solution (2.5% KCl), and plant growth regulators (indole acetic acid, cytokinin, ethephon and gibberellic acid) on emergence, seedling vigor, N response, and grain yield of corn. Time to seedling emergence, seedling vigor, and growth were measured in a pot experiment under a greenhouse condition while field performances, N response, and grain yield were determined in field experiments. In the greenhouse study, none of the treatments were better than the unsoaked control. Under field conditions, both hybrids and N application had significant effects on grain yield, but there was no yield advantage due to any of the seed treatments. Seed soaking with 20 ppm gibberallic acid (GA₃) solution for 30 min improved seedling vigor (i.e., seedling height and growth), but this was not translated into greater grain yield. Seed soaking with water for 16 h significantly reduced percentage emergence and final plant stand in 2002 while in 2003, seed soaking with 2.5% KCl and 20 ppm GA₃ solution for 16 h significantly reduced plant stand and grain yield under the 150 kg N ha^–1 treatment. Despite some positive effects of seed priming on seedling vigor and stand establishment, none of the seed-priming treatments tested showed beneficial effects on grain yield and N efficiency under the temperate-humid conditions such as in eastern Ontario.

Abbreviations: CCC, chlormequat chloride • GA₃, gibberallic acid • IAA, indol acetic acid • NDVI, normalized difference vegetation index • PGR, plant growth regulator

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