Document Type : Research Paper


1 department of Agriculture, Vellayat University of Iranshahr, Iranshhsr, Iran

2 vali asser university


This research was performed in Vali-e-Asr University laboratory in 2020 in a completely randomized design with four replications. The carried out to quantify the rate of Guar germination in response to temperature, and water potential. The seeds were 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 made of polyethylene glycol 6000). The results revealed that the Beta function is suitable for describing the response to temperature, and water potential. Under different water potentials, base, optimum and ceiling temperatures ranged in 7.3 to 12 °C, 22.1 to 25.8 °C, and 32.2 to36 °C, respectively. The hydrothermal time parameters were 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 in the establishment and management of guar for cultivation in different areas.