The combined effect of different levels of salinity and irrigation water on physiological characteristics of forage sorghum in different cuttings

Use poor quality resources of water and soil for food production in developing countries must be considered . Therefore, this study done on the plant forage sorghum in different levels of salinity (2, 5 and 8 dS m) and different irrigation levels (120, 100, 75 and 50% of water requirement) in three stages harvesting forage in the form of factorial split plot design with 12 treatments and 3 replications.The results showed that with increasing salinity and irrigation water depth decreases, yield decrease. But between treatment perfected irrigation and %75 crop water requirement significant difference was not observed. Also Between treatments with salt 2 and 5 ds/m significant different in feed production was not observedShowed the effects of harvesting forage yield in the second harvest was better than the first and third harvest. chlorophyll ratio a to b and percentage of proline increased and percentage of caroteniods, chlorophyll a and b increased with increasing salinity and decreasing Irrigation water depth. Thus, according to the results and the lack of water in the region can irrigate the plants with %75 of water and salinity 5 ds/m Without any significant effect on the amount of forage produced and the stored water can be used elsewhere and the best cutting forage for yield and quality is the second harvesting.