The study of two new maize hybrids indicated that responses of leaf physiological traits to density was sensitive,and the difference of density-tolerance between two hybrids was significant.The hybrid with stronger density-tolerance had such characteristics:(i)the change rate of leaf orientation value (LOV) was bigger;(ii)leaf area per plant reduced slowly with density increasing;(iii)the response of leaf photosynthetic rate to density increasing was not sensitive.
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