The first step to control many noxious nematodes by using organic amendments, is to select the suitable biocidal plant such as, sunn hemp (SH) Crotalaria juncea L. this plant used mainly as a green manure and it is a poor host for several plant- parasitic nematodes as well. In the present study Sunn hemp was cultivated as an amendment plant in the crop rotation. The dried dropped leaves were plowed in the soil. After two weeks, the initial population (Pi) of nematodes was estimated, the land was divided into small plots and cultivated with one of following plants: Lactuca  sativa L., Chorchorus  olitarius ,  Cucumis  sativus,  Allium  cepa,  Lycopersicum esculentum,  Capsicum  annum,  Solanum  melongena,  Phaseolus  vulgaris,  Vigna  sinensesand  Vicia  faba. Final population (Pf) and rate of reproduction were estimated, and  data showed that, lethal effects varied with regard to nematode type.  Rotylenchulus  reniformis  was the high tolerant  to SH as a green manure followed by Pratylenchus, while, Meloidogyne and Helicotylenchus were less tolerant to  sunn hemp amendment. On  the  other  hand, sunn hemp increased the abundances of non parasitic nematodes. In conclusion, using sunn hemp could  increase the fertility of the soil,  and promising as an alternative for  managing  plant parasitic  nematodes efficiently and  has the ability to enhance the free living nematodes.