mohsen zafaranieh; arman Azari
Abstract
The present study tries to quantify germination response of Guar (Cyamopsis tetragonoloba) to temperature and water potential. Performed in Vali-e-Asr University laboratory in 2020, it is a completely randomized design in a factorial arrangement with four replications. It aims at quantifying the rate ...
Read More
The present study tries to quantify germination response of Guar (Cyamopsis tetragonoloba) to temperature and water potential. Performed in Vali-e-Asr University laboratory in 2020, it is a completely randomized design in a factorial arrangement with four replications. It aims at quantifying the rate of Guar germination in response to temperature, and water potential. The seeds have been germinated at seven temperatures (5, 10, 15, 20, 25, 30, and 35°C) and six water potentials (0, -0.2, -0.4, -0.6, -0.8, and -1 MPa). The results reveal that the Beta function is suitable for describing the response of seed germination temperature, and water potential. Under different water potentials, base, optimum, and maximum temperatures have been 7.3-12°C, 22.1-25.8°C, and 32.2-36°C, respectively. The hydrothermal time parameters are 268.3 bar °C h, -1.103 MPa and, 8.36°C for ɵHT (hydrothermal time constant). The data obtained from these models can be used to establish and manage guar for cultivation in different areas.
Elham Rastegari; Shahab Maddah Hosseini; Arman Azari
Abstract
In order to evaluate the effect of irrigation intervals on the vegetative growth and grain yield of grass pea (Lathyrus sativus L.)and hairy vetch (Vicia villosa Roth.), a field split plot experiment was conducted based on the randomized complete blocks design with four replications in research farm ...
Read More
In order to evaluate the effect of irrigation intervals on the vegetative growth and grain yield of grass pea (Lathyrus sativus L.)and hairy vetch (Vicia villosa Roth.), a field split plot experiment was conducted based on the randomized complete blocks design with four replications in research farm of Vali–e–Asr University of Rafsanjan during April to July, 2013. Main plots were irrigation levels including 40, 60, 80 and 100 mm evaporation from evaporation pan class A and sub plots were crop species in two levels as grass pea and hairy vetch. Result showed that 66 days after sowing (two weeks before flowering), relative water content (RWC) of grass pea and hairy vetch leaves significantly reduced by increasing irrigation amount more than 40 mm, however there were no significant differences between 60, 80 and 100 mm. Also, plant leaf area and biomass of grass pea and vetch were reduced by increasing irrigation level (77 and 73 percent, respectively). Both crops had similar biomass (1.1 and 1.2 g. plant -1 for control and 0.5 and 0.6 for 100 mm irrigation treatments for grass pea and vetch, respectively), while the grass pea had higher leaf area than hairy vetch (4 to 9 folded). Finally, yield and yield components of both crops decreased by irrigation interval, although grass pea had always higher yield components, as grain yield, 1000 grains weight, seed number and pod number per plant at 100 mm irrigation treatment were 4.8, 2.4, 3.7 and 3.2 fold higher than vetch. Results suggest that both crops well tolerated increasing irrigation interval and they were suitable for forage production if harvested at the flowering stage. However, grass pea was better for grain production and had higher drought tolerance.
Elham Rastegari; Shahab Madah hoseini; Arman Azari
Abstract
at the research farm of Vali-e-Asr University of Rafsanjan in 2013. The experiment was arranged in a randomized complete block design with four replications and four irrigation intervals. Irrigation was done after 40 (control), 60, 80 and 100 mm evaporation from pan class A, from seedling establishment ...
Read More
at the research farm of Vali-e-Asr University of Rafsanjan in 2013. The experiment was arranged in a randomized complete block design with four replications and four irrigation intervals. Irrigation was done after 40 (control), 60, 80 and 100 mm evaporation from pan class A, from seedling establishment till physiological maturity. Results showed that irrigation level did not significantly change percentage of qualitative traits including Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), starch and crude protein as well as 1000- seed weight. However, above mentioned qualitative traits content as well as seed number per plant, seed and biological yield were significantly affected by irrigation interval. Based on mean comparison results, only 100 mm evaporation treatment significantly reduced qualitative traits content and there were no significant differences between 40 to 80 mm evaporation. Also, seed yield, seed number per plant and shoot biomass were the highest in 40 mm (165.5 g/m2, 36.17 per plant and 2.4 g/plant, respectively) and the lowest in 100 mm irrigation treatment (63.1 g/m2, 24.5 per plant and 1.07 g/plant, respectively). Based on the results, it seems that grass pea qualitative forage yield is relatively tolerant to water deficit till 80 mm evaporation.