تأثير تراكيز مختلفة من حامض الجبرليك (GA3)‎ في نمو و حاصل بعض أصناف الذرة البيضاء Sorghum bicolor(L.)‎ Moench

Abstract EN

Afield experiment was conducted at Hussainyah township of kerblal , Iraq in the summer season of 2013 to study the effect of foliar application of gibberellic acid GA3on growth and yield of three Sorghum bicollor (L.) cultivars(inqath,rabeh,kafeer) .

The design of the experiment was factorial experiment R.C.B.D.

with three replicates .

The experiment consisted of two factors .The first factor included three sorghum varieties and the second factor included GA3 concentrations ( 0 , 50 , 100 , 150 mg.L-1 ),The result showed that : rabeh gave highest values of the leaf number panicles weight and grain yield they were ( 10.417 leaf plant-1 , 108.6 gm and 11.20 t.ha-1 ) respectively .

Spraying with 100 mg.L-1 of GA3 improved significantly 1000 grain weight ( 30.86 gm ) and the spraying 150 gm.L-1 GA3 improved significantly grain yield ( 9.91 t.ha-1) and it was no significant different when spraying with gibberllic acid conceutrantion 100 gm.L-1 The interaction between GA3 concentration and cultivars was significant in the plant height and 1000 grain weight .

It can be concluded that , spraying 100 mg .

L-1 of GA3 concentration led to significant increase in grain yield .