Roundup Efficacy TrialRoundup Efficacy TrialNC, 2010NC, 2010

Weeds: Summer Weeds – pigweed + ragweed + carpet weed + crab

grass Winter weeds – henbit weed, chic weed

Products Roundup 1qt per acre in 30 gallon water per acre PeKacid – 5 lbs/acre in 30 gallon water per acre (tank mix with

the Roundup) Prolec (surfactant) – 1 pint per acre (tank mix with Roundup)

1 spray Location – NC, USA

Roundup + Prolec+PeKacid

Roundup Roundup + Prolec

Roundup + PeKacid

PeKacid Effect on Roundup ActivityPeKacid Effect on Roundup ActivitySummer WeedsSummer Weeds

PeKacid Effect on Roundup ActivityPeKacid Effect on Roundup ActivityWinter WeedsWinter Weeds

Roundup + PeKacid Roundup + Prolec+PeKacid

ConclusionConclusion

PeKacid added to Roundup increases herbicide efficacy primarily by lowering the solution pH and preventing the Roundup from reacting with Ca and/or Mg

PeKacid concentration tested in this study was 2% (5 lbs in 30 gal), however a lower rate of PeKacid of 0.8% (2 lbs in 30 gal) is expected to have similar effect

Pekacid spray can be considered as double actions: Feed & Kill