Esmail Nabizadeh, Mojdeh Banifazel and Elnaz Taherifard
Maize has now become an important staple food. In Iran, maize in its many forms is included as a part of the diet of many people. In order to study the effect of plant growth promoting on grain and biological yields of maize under drought stress condition, using three levels of drought stress including D1 (100% plant water requirement-control), D2 (80% plant water requirement) and D3 (60% plant water requirement) as main plots and seven kinds of plant growth promoting as foliar spray (P1= Marmaryn; P2= Dalgin; P3= Multi Purplex; P4= Grofolan; P5= Stimurel; P6= HB-101; and P7= control-without foliar spray) as sub plots, an experiment was conducted using a split block experiment based on completely randomized block design with four replications. The study was done at the Agricultural Research Station of Saatlo in Urmia, Iran during 2011 growing season. The results of this study showed that drought stress levels, various plant growth promoting and interaction of them had significant effects on all measured traits of maize. The mean comparison showed that, maximum grain yield (20.51 g m-2) and biological yield (40.85 g m-2) were obtained from D1 (100% plant water requirement-control) and in the case of the plant growth promoting obtained from P6= HB-101 and P5= Stimurel, respectively. From the results, it can be concluded that, apply 100% plant water requirement for all measured traits with foliar spray of different plant growth promoting (depending to the desired trait) are recommended to increase function of maize.
