To solve weed problems for seedling alfalfa in South Jiangsu Hilly Area,companion crops were tried with five varies of four species of crops(perennial ryegrass,annual ryegrass,rye,and triticale).

• 为解决苏南丘陵区苜蓿苗期的杂草问题,从保护播种入手,在多年生黑麦草、一年生黑麦草、黑麦、小黑麦四种作物共五个品种中寻找适宜的伴生作物。