Abstract
Polymer-coated urea (PCU) may facilitate nitrogen (N) placement with the seed. Laboratory experiments evaluated the effect of (i) variety and N treatment and (ii) urea contact with the seed on winter wheat (Triticum aestivum L.) emergence. Four varieties were grown in a silt loam soil (–200 kPa Ψm, where Ψm is matric potential) with control (0 kg N ha−1), PCU treatment (44% N) at 56, 112, and 168 kg N ha−1, or urea treatment (56 kg N ha−1) placed with the seed. One variety had less emergence than the control with PCU at N rates ≥112 kg ha−1. Urea delayed and decreased emergence of all varieties. In another experiment, urea (56 kg N ha−1) was placed in contact with or between seeds. The contact treatment exhibited delayed and lower emergence. The no-contact treatment behaved similar to controls. Large amounts of 44% N PCU can be placed with the seed without reducing wheat emergence when soil Ψm is at least –200 kPa.
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