8Maiti R K,Wesche E.Maize science.Science publisher ,Inc.1998,56-62
9Joel D M.The long-term approach to parasitic weeds control:manipulation of specific developmental mechanisms of the parasite.Crop Protection,2000,19:753-758.
6Carl A T. Some factors affecting germination of celery seed [J]. Plant Physiology, 1948(5) : 93 -102.
7Ueno K. Effect of desiccation and a change in temperature on ger- mination of immature grains of wheat ( Tr/t/cum aestivum L. ) [J]. Euphytiea, 2002, 126:107-113.