Genestein effects on yield and yield components of annual medics under low root-zone temperature

In order to study the effect of different Genestein concentration on yield and yield components of annual medic varieties under 50C root- zone temperature, an experiment was conducted in Faculty of Agriculture of Tarbiat Modares University in a growth chamber with 20/250C day/ night temperatures with three annual medics containing (Medicago polymorph cv. Santiago, Medicago radiata cv. Radiate, and Medicago rigidula cv. Rigidula) and five Genestein levels including 0, 10, 20, 30 and 40 micromole/lit. Experiment was conducted in factorial arrangement in complete randomized block with three replications. There were differences among varieties for dry matter and yield components and Medicago rigidula in measured parameters had better condition than other species and had more yield. 20 micromole/lit Genestein increased forage yield and yield components of Medicago varieties at 50C root- zone temperature. Medicago rigidula was better than other varieties for most measured traits under Genestein 20 micromole/lit. Thus it may be suitable for cultivation in ley-farming system at cold and temperate zones.