Nikrooz Shirinzadeh; Mohammad Hassan Biglouei; Karamat Akhavan; Adel Mohammadi
Abstract
In order to investigate the effect of deficit irrigation on quantitative and qualitative characteristics of wheat (Triticum asetivum L.) Morvareed cultivar, an experiment has been carried out with three main treatments including surface drip irrigation (TS), subsurface drip irrigation (TSS), and Furrow ...
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In order to investigate the effect of deficit irrigation on quantitative and qualitative characteristics of wheat (Triticum asetivum L.) Morvareed cultivar, an experiment has been carried out with three main treatments including surface drip irrigation (TS), subsurface drip irrigation (TSS), and Furrow irrigation (F), as well as three submain treatments containing irrigation levels 50% (I1), 75% (I2), and 100% (I3) of the plant water requirement. It has taken place in the research farm of Ardebil Agricultural Research and Training Center in Moghan region during 2016-2017. The experiment is conducted as split plot based on randomized complete blocks design with three replications. Results show that the highest 1000-grain weight, harvest index and number of tillers per unit area are obtained with 0.05 kg, 42% and 448.56 in I3 and protein content with 9.56% in I1, respectively. Also, the highest grain yield (7122.33 kg ha-1) is obtained from the TS with irrigation level of I3 (no significant difference between I3 and I1). Meanwhile, the highest water productivity based on grain yield with 1.81 kg m-3 is obtained from the treatment of F with I1. The lowest grain yield with 2866.67 kg ha-1 and water productivity based on grain yield with 1.05 kg m-3 belongs to F with irrigation levels of I1 and I3, respectively. Therefore, the surface drip (TS) with 75% (I2) and 100% (I3) of crop water requirement in conditions of water deficiency and no-water-deficiency, respectively, can be considered as optimum methods for wheat production in the Moghan region.
Kamran Amiri Nasab; Hedayat Zakizadeh; Mahmoud Ghasemnezhad; Hassan Biglouei
Abstract
Drought preconditioning (DP) is a method of irrigation with low frequency and longer duration, to extend the root system and suppress drought damage in plants. In the present study, the effect of DP for 30 days on increasing tolerance to drought stress in two turfgrass species, creeping bentgrass (Agrostis ...
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Drought preconditioning (DP) is a method of irrigation with low frequency and longer duration, to extend the root system and suppress drought damage in plants. In the present study, the effect of DP for 30 days on increasing tolerance to drought stress in two turfgrass species, creeping bentgrass (Agrostis stolonifera cv.Palustris) and tall fescue (Festuca arundinacea cv. Greystone) was investigated. DP and control plants were irrigated for 50 days with different levels of soil suction (20-23,40-43, 50-53 and 70-73 centibar), and finally, plants were watered up to field capacity point for 15 days, to recover from stress. Results showed that DP significantly lead to reduction in shoot length and increase in root length in both turfgrass species. DP plants showed less shoot dry and fresh weight and also less electrolyte leakage (EL) at each levels of stress, in compare with the control. Furthermore, DP plants showed greater reduction in EL after recovery. DP treatment also reduced leaf RWC at the end of 50 days of stress and after recovery in tall fescue, but in creeping bentgrass retained it at the control level. Overall, it appears that DP treatment can increase tolerance to drought stress in two species with increasing root length, reducing shoot length and EL and preserving leaf RWC.