study of some variables effecting on the degree of farmers knowledge and implementation regarding the technical recommendations of relay intercropping to cotton with wheat in Sharkia Governorate [Egypt]

agricultural workers algodón blé coton cotton cultivo intercalado culture intercalaire egipto egypt extension activities extensión farming systems intercropping obreros agrícolas sistemas de explotación système d'exploitation agricole travailleur agricole trigo vulgarisation wheats égypte