“四边”桑(是指在田边、地边、沟边、路边栽植桑树)为1980年农业部技术改进受奖项目之一。目前,“四边”栽桑已普及四川全省各地,成为发展蚕桑生产的主要形式。随着“四边”种桑技术的改进,不少农村种桑已做到合理布局、合理密植、适时嫁接良种、养成优良树型和贯彻采养结合等综合技术,实现了“四边” “Four Sides” Sang (refers to the edge of the fields, land, ditch edge, planting mulberry roadside) for the Ministry of Agriculture in 1980 one of the project award-winning technology. At present, the “four sides” planted mulberries have spread throughout Sichuan Province and become the main form of the development of sericulture production. With the improvement of the “four sides” cultivation technology, many rural species of mulberry have achieved reasonable layout, reasonably and densely populated, timely grafting of elite species, fostering good trees and implementing comprehensive technologies like harvesting and combination to achieve “four sides”