Abstract

Three experiments were conducted to evaluate the effect of fertilizer placement on prostrate spurge growth (Chamaesyce prostrata) in container production. In experiment one, Polyon 17N–2.TP–9.2K (17–5–11) was topdressed or dibbled at 45 g (1.6 oz) or 90 g (3.2 oz) per 11.3 liter (#3) container and either 90 g (3.2 oz) or 180 g (6.3 oz) per 26.3 liter (#7) container. In experiments two and three, 180 g (6.3 oz) of Polyon 17N–2.1P–9.2K (17–5–11) was topdressed or dibbled per 26.3 liter (#7) container. In all experiments 20 prostrate spurge seed were applied to the container surface 30 days after potting. In all experiments, weed count and weight were less in dibbled containers compared to topdressed. Across all experiments, weed shoot weights at or beyond 90 days after potting were from 31 to 888% greater in topdressed containers, compared to dibbled containers. Overall, dibbling fertilizer greatly reduced weed growth while producing no visible difference in ornamental plant growth.