Publications for:

pest = Portulaca oleracea (weed)
crop = Maize/corn (Zea mays)
country = Brazil (NE)

found 2 publications:

2010

Green ear yield and grain yield of maize cultivars in competition with weeds
Planta Daninha (2010) 28 (1), 77-85
publishers website - pestinfo wiki

2004

Weed control and green ear yield in maize
Planta Daninha (2004) 22 (1), 137-144
publishers website - pestinfo wiki