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Title

INVESTIGATION OF TRAITS CORRELATIONS, REGRESSION AND PATH ANALYSIS FOR YIELD AND YIELD COMPONENTS OF TWO CORN HYBRIDS IN DIFFERENT TREATMENTS OF DROUGHT STRESS AND IRRIGATION METHOD

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 Start Page 89 | End Page 109

Abstract

 In order to determination most important traits affecting grain and biological yield of two COM hybrids under different treatment of drought stress and irrigation method, a field experiment was conducted similarly in 2006 and 2007, at agricultural research farm of Karaj Islamic Azad University (35o43' N latitude, 50o56' E longitude, 1160 m altitude). The experiments were laid out in factorial-split plot using randomized COMplete block design with three replications. Main plots consisted drought treatments which were the plant irrigation after 40%, 60% and 75% available water loss and irrigation methods in 2 levels (Irrigation of all furrows and irrigation furrows alternately). Two COM hybrids (SC704 and SC647) also used as a sub plot treatments. There was significant correlation between grain yield and biomass, cob yield in m2, grain weight, grain number in cob row, grain number in cob, plant height and also inoculated part of cob negatively. Results of STEPWISE REGRESSION revealed that inoculated part of cob, grain number in cob, row number in cob, cob number in m2 and cob yield in m2 were important COMponents in grain yield. But important COMponents in biological yield were plant height, grain number in cob row and cob yield in m2. Results of PATH ANALYSIS showed that inoculated part of cob had the most direct effect (-0.523) on grain yield. Other COMponents had the most indirect effects on grain yield by inoculated part of cob. Plant height had the most direct effect (0.917) on biological yield. Other COMponents had the most indirect effects on biological yield by plant height. In general, inoculated part of cob and grain number in cob were the most important COMponents in grain yield and plant height was the most important COMponent in biological yield.

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