The Impacts of Palisade® Rates and Nitrogen Fertilization On Rice Lodging.

‘CL151’ has become a popular rice cultivar because of its high yield potential; however, lodging is problematic. A field experiment was conducted to evaluate potential management practices to minimize lodging. The experiment consisted of a factorial combination of treatments. Factor A was Palisade^® (trinexepac-ethyl) rate and levels were 0, 96, 193, and 385 mL ha^-1. Factor B was nitrogen timing with levels being 100% of the N applied preflood (PF) or 75% applied PF and the remaining applied at panicle differentiation (PD). Factor C was Palisade^® timing with levels being PD and PD+14 days. The experiment was conducted on a Dundee silt loam (Typic Endoaqualfs) soil. Treatments were arranged in a randomized complete block design and replicated four times. Response variables included lodging (percent of the plot and severity), plant height, and grain yield. Percent lodging was influenced by Palisade^® rate. Lodging was greatest (26%) when no Palisade^® was applied, but 96 mL ha^-1 reduced lodging to less than 2%. Lodging severity was also influenced by Palisade^® rate. Lodging severity was 2.0 when no Palisade^® was applied and 1.1 when the highest rate was applied. Plant height was affected by Palisade rate and timing. As the rate of Palisade^® was increased, the plant height decreased with height being  reduced by 18% with the highest rate of Palisade^®. Plant heights were also greatest when the N was applied 100% PF. Grain yield was affected by Palisade^® rate and timing. Grain yield decreased from 13622 kg ha^-1 when no Palisade^® was applied compared to 10739 kg ha^-1 when the highest rate was used.  These data suggest Palisade^® can reduce plant lodging and plant height; however grain yields can be negatively impacted with higher rates of Palisade^®.