Physiological Studies on Rice

Two field experiments were carried out at the experimental Farm of Sakha Agriculture Research Station, Kafr EL-Sheikh Governorate,Egypt, during the two successive summer seasons of 2012 and 2013 to study the effect of planting method (Transplanting and drill) and sowing dates( April 15th, May 1st and May 15th)on growth, yield and its components of GZ 7112,GZ 9057 and Sakha 105 rice varieties under D.U.S. experiment. The results showed that, GZ 9057 sown on April 15th using transplanting method significantly produced higher number of tillers /m2, panicle length (cm),flag leaf angle (),flag leaf area(cm2),panicle weight(g), panicle density(%)and number of grains/panicle. The highest values for grain yield were(4.31 and 4.65 t/fed.)recorded by GZ 9057 with early sowing date under transplanting method during the 2012 and 2013 seasons.The line GZ7112 sown on April 15th using transplanting method significantly produced higher total duration and plant height(cm) during the two seasons. These results concluded that, the cultivate GZ 9057 rice line under transplanting method could be used as the optimum method for the distinctness, uniformity and stability experiments(D.U.S)