Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 52 3 2021 09 23 Effects of irrigation regime and plant density on some yield and ecological and physiological indications of chickpea (Cicer arietinum L) Effects of irrigation regime and plant density on some yield and ecological and physiological indications of chickpea (Cicer arietinum L) 163 174 84620 10.22059/ijfcs.2020.314020.654776 FA Naser Majnoun Hosseini Agronomy and Plant Breeding Dept. Faculty of Agriculture, University of Tehran, Iran Mohammad Bagher Gholami Agronomy and Plant Breeding Dept. Faculty of Agriculture, University of Tehran, Iran Mohammad Reza Jahansouz Agronomy and Plant Breeding Dept. Faculty of Agriculture, University of Tehran, Iran Esmaeil Afshoon Agronomy and Plant Breeding Dept. Faculty of Agriculture, University of Tehran, Iran Ehsan Rabieian Agronomy and Plant Breeding Dept. Faculty of Agriculture, University of Tehran, Iran Journal Article 2020 11 23 In order to investigate the effects of irrigation regime and plant density on agronomic and some physiological traits of chickpea (<em>Cicer arietinum</em>), a split-plot layout based on a randomized complete block design with three replications conducted at the research field of University of Tehtan (Karaj- Iran) in 2015-2016. The irrigation regime included eight levels (A1 =full irrigation at all growth stages, A2 = irrigation to grain filling and then cut, A3 = irrigation to podding and then cut, A4 = irrigation to flowering and then cut, A5 = low irrigation or 50% of full irrigation at all growth stages, A6 = 50% of full irrigation to grain filling and then cut, A7 = 50% of full irrigation to podding and then cut, A8 = 50% of full irrigation to flowering and then cut) and plant density at three levels (30, 40 and 50 plants.m^-1) were considered as the main and subplots factor, respectively. The results showed that total chlorophyll and chlorophyll a, b, leaf area index, leaf relative water content, light use efficiency and seed yield were declined under water deficit but the light extinction coefficient and water use efficiency increased. The highest seed yield (2068 kg/ha) obtained from 40 plants.m^-2. Also, under the low irrigation conditions, by applying 50% irrigation in all stages of chickpea growth the optimum yield can be produced. In order to investigate the effects of irrigation regime and plant density on agronomic and some physiological traits of chickpea (<em>Cicer arietinum</em>), a split-plot layout based on a randomized complete block design with three replications conducted at the research field of University of Tehtan (Karaj- Iran) in 2015-2016. The irrigation regime included eight levels (A1 =full irrigation at all growth stages, A2 = irrigation to grain filling and then cut, A3 = irrigation to podding and then cut, A4 = irrigation to flowering and then cut, A5 = low irrigation or 50% of full irrigation at all growth stages, A6 = 50% of full irrigation to grain filling and then cut, A7 = 50% of full irrigation to podding and then cut, A8 = 50% of full irrigation to flowering and then cut) and plant density at three levels (30, 40 and 50 plants.m^-1) were considered as the main and subplots factor, respectively. The results showed that total chlorophyll and chlorophyll a, b, leaf area index, leaf relative water content, light use efficiency and seed yield were declined under water deficit but the light extinction coefficient and water use efficiency increased. The highest seed yield (2068 kg/ha) obtained from 40 plants.m^-2. Also, under the low irrigation conditions, by applying 50% irrigation in all stages of chickpea growth the optimum yield can be produced. https://ijfcs.ut.ac.ir/article_84620_bf8365a04054fb04c653a41959055a0c.pdf