9Skinner, R. H. , Hanson, J. D and BejjaminJ. G. ( 1998) . Root distribution following spatial separation of water nitrogen supply in drip irri-gation com [ J]. Plant and Soil,199 :pp. 187 ~ 194. 被引量：1
10^akir,R. (2004). Effect of water stress at different development stages on vegetative and reproductive growth of com [ J]. Field Crops Re-search 1) :pp. 1 -16. http://www. sciencedirect. com/science. 被引量：1
