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The grey relational grade analysis between the yield of maize hybrid and the main characters

GU Jinchun,PENG Zhonghua,DAI Baowei(Maize Research Institution, Agricultural College, Guizhou University,Guizhou Guiyang 550025, China)  
The relational grade has been analysed between the eight main characters of the twelve maize hybrid combinations and yield per plant using method of the relation grade in the grey systematic theory. The results show that the relational grades between the yield of the maize hybrids and the relative characters are as follows: highness of maize 0.5854, highness of spike 0.5512, length of spike 0.5655, row number of spike 0.6374, seed number of row 0.6311, crassitude of spike 0.6797, area of spike three leaves 0.7316, hundred seed weight 0.6240; the sequence of the relational grade: area of spike three leavescrassitude of spikerow number of spikeseed number of rowhundred seed weighthighness of maizelength of spikehighness of spike; and the grey weight of each character is respectivelyw0∶w1∶w2∶w3∶w4∶w5∶w6∶w7∶w8= 0.17∶0.10∶0.09∶0.09∶0.11∶0.11∶0.11∶0.12∶010.
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