Managing clethodim resistant ryegrass in canola with crop competition and pre-emergent herbicides

To investigate the effect of crop competition and different pre-emergent herbicides and their mixtures on annual ryegrass control in canola.本研究旨在探究作物竞争作用、不同苗前除草剂（pre-emergent herbicides）及其复配组合对油菜（canola）田一年生黑麦草（annual ryegrass）防除效果的影响。