1. Heilongjiang Inst itute of Agricultural Modernization , Chinese Academy ofSciences 150040 2. Heijiang Agricultural Sciences Institute of Heilongj iangAcademy of Agricul tural Sciences 154007 3. Soybean Institute of HeilongjiangAcademy of Agricul tural Sciences 150086
In 1994- 1996, in 5 di fferent ecoregions of Heilo ng jiang prov ince some fieldex periments were co nducted. These ex periments include screening of soybean cul tiv ars( lines) fo r resistance or tolerant to co ntinuous and al terna te- yea r soy bean cro pping ,and test o n manag ement practices and prev entiv e ag ent s selectio n fo r continuous andal terna te- y ea r cropping . The ex periment s result s indicated that some cul tiv ars( lines)a re resistant to soi l - borne diseases and pest s of so ybean root of continuo us andal terna te- y ea r cro pping and w ith hig h yield, such as Kang xian 1, Hefeng 25, Heino ng39, Hei jiao 92- 1544, Suinong 10 a nd Heinong 35. Ag ro nomic ma nagement po tassiumfertili zer, applicatio n of o rganic fer tili zer, split ting o f ridg es fo r adding fertili zer, deepdig ging , and several seed - coa t - ag ent s a re recommended, special ag ent s fo rcontinuous soybean cro pping can reduce ef fectively so ybean yield loss of co ntinuous andal terna te- y ea r cro pping.