TY - JOUR AU - Gliessman, Stephen R. AU - Altieri, Miguel A. TI - Polyculture cropping has advantages JF - California Agriculture JO - Calif Agr Y1 - 1982/07/01 VL - 36 IS - 7 SP - 14 EP - 16 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v036n07p14 AB - Mixing crops and letting some weeds grow reduced pest insects and encouraged their natural enemies.