Gap colonization by weeds in a wheat crop grown under different cultivation regimes

aradura biodiversidad biodiversity cero-labranza comunidades vegetales control cultural cultivation cultivo cultural control escarda espacement espaciamiento flora flore labour labranza lutte culturale lutte physique malezas mauvaise herbe physical control plant communities ploughing pratique culturale spacing species diversity tillage travail du sol trigo triticum aestivum weed control weeds wheats zero tillage