فهرست مطالب mohammad safaee torghabeh

To evaluate drought tolerance of three cultivares of forage millet and one variety of sorghum, this experiment was conducted as split split plot based on a randomized complete block design with three replications. Irrigation frequencies consisted of irrigation after 80 (control), 120 and 160 mm evaporation from class A pan as main plots and sub-plots was consisted of sorghum cultivar (Sorghum bicolor cv. Speedfeed) and three cultivares of millet (Setaria italica cv. Bastan, Panicum miliaceum cv. Pishahang and Pennisetum americanum cv. Nutrifeed). Flage leaf sampling was done at three stages, before, one and three days after irrigation. According to the results, delaying in irrigation caused a reduction in leaf pigments and yield of forage, and it also increased proline, sucrose and soluble sugars of leaf.  Continuation of drought stress effects was observed in the days after irrigation. According to the results for the studied cultivars, 120 and 160 mm evaporations were the moderate and sever irrigation frequencies respectively. It needed at least three days to recover the effects of moderate stress. Speedfeed sorghum produced maximum yield, in each irrigation frequencies. The highest forage dry yield (9376 Kg/ha) belonged to speedfeed sorghum under normal irrigation for. There were positive correlations between yield and proline and sucrose as osmotic regulators, but leaf pigments had no significant correlation. Speedfeed sorghum had also high ability to adapt, and it repaired damages faster than millet cultivares after irrigation.

To study the effects of delayed irrigation on growth and ratoon of millet (Pennisetum americanum cv. Nutrifeed) in the first harvest and sorghum (Sorghum bicolor cv. Speedfeed), a field experiment was conducted as split plot based on a randomized complete blocks design with three replications in Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Iran, at summer 2014. Factors consisted of irrigation regime at three levels, including irrigation after 80 (control), 120 and 160 mm evaporation from a Class A evaporation pan as main plots, crop species at two levels, including Nutrifeed (millet) and Speedfeed (sorghum) as subplots and harvest number ( at two levels) as sub-sub plots. At regrowth, all treatments were irrigated as control regime (80 mm evaporation). At 1st harvest, delayed irrigation decreased leaf photosynthetic pigments contents, LAI, SLA, LWR, leaf and stem dry weight and forage yield and increased proline, sucrose and leaf soluble sugars contents at both species. Similar effects of delayed irrigation were observed at regrowth. The highest forage yield belonged to normal irrigation of Speedfeed (9376 kg/ha), however, Nutrifeed showed a better performance at regrowth (4250 and 3816 kg/ha of forage, respectively). Nutrifeed had a better forage quality, owing to a higher leafiness index at both harvests (46.7% and 45.0%, respectively).