Investigation of morphological traits of ten new forage sorghum varieties

In order to study different characteristics، 10 new varieties of forage sorghum in two cutting in a split plot in time، based on a randomized complete block design in four replications، were tested in Karaj. All of the varieties are pure line variety; including: KFS1، KFS2، KFS3، KFS6، KFS8، KFS9، KFS12، KFS15، KFS17 and KFS18. Important factors such as the number of leaves، plant height، stem diameter، were recorded each timely. Combined analysis of variance showed significant differences between varieties (except tiller number)، cuttings and variety * cutting interactions (Only plant height) for all study traits at 1% level probability. The highest and lowest leaf area mean were produced from KFS6 and KFS18 with 512/84 and 353/25cm2. The highest stem diameter obtained from KFS3 with 1/ 75 cm and the lowest with 1/53 cm from KFS12. The highest and lowest number of tillers، belonged to KFS3 with 3/19 and KFS1 with 2/28 respectively. The highest and lowest of leaves obtained from KFS2 and KFS15 with 14/56 and 11/75 respectively. The highest total dry matter yield varieties KFS18، KFS1، KFS3 respectively 66/21، 24/20، 16/18 tons per hectare produced. KFS6 lowest Dry forage yield variety with 70/13 ha in total، two cutting produced.