A. Poshtdar; A.R. Abdali Mashhadi; F. Moradi; S.A. Siadat; A. Bakhshandeh
Abstract
A range of methods are applied to enhance secondary metabolism in medicinal plants. Treatment of the plants with elicitors is one of these approaches. Salicylic acid (SA) exerts a positive impact on plant growth and yield. The present study, as a biannual field experiment, investigates the response of ...
Read More
A range of methods are applied to enhance secondary metabolism in medicinal plants. Treatment of the plants with elicitors is one of these approaches. Salicylic acid (SA) exerts a positive impact on plant growth and yield. The present study, as a biannual field experiment, investigates the response of peppermint (Mentha piperita L.) to different rates of SA under different regimes of nitrogen nutrition during years of 2014-2015. The experiment was made as a random complete block design based on split-plot with three replicates. The treatments included nitrogen fertilization rate as the main factor (0, 70, 140, 210, and 280 kg N ha-1 applied as urea) and salicylic acid, as the sub factor, was spayed at different concentrations (0, 100, 200, and 300 μM). In both years, the highest nitrate reductase activity was found in the roots of the plants treated with 200 μM SA and fertilized with 280 kg N ha-1. Interestingly, the foliar activity of the enzyme was influenced only by nitrogen, whereas the highest rate of activity was determined using 280 kg N ha-1 (2.87 and 2.82 μM nitrite g-1 FW h-1, respectively in the first and second year). Higher concentration of SA caused to increased content of nitrogen and free amino acid in the plants fertilized with higher rates of nitrogen. Nitrate, total phenol, and soluble carbohydrates content of leaf was reduced in both years as the result of high rate of nitrogen and high concentration of SA applied. In the first and the second year, the highest fresh yields (3316.2 and 3480.7 g m-2, respectively), the highest dry yields (811.7 and 855.6 g m-2, respectively) and essence (13.01 and 15.2 mL m-2, respectively) were obtained through annual application of 210 kg N ha-1. Collectively, the application of 210 kg N ha-1 together with SA (200μM) is recommended to achieve desired quantitative and qualitative yield.
H. Hasanvand; S.A. Siadat; A.M. Bakhshandeh; M.R. Moradi Telavat; A. Poshtdar
Abstract
In order to study the yield and some physiological characteristics of borage (Borago officinalis L.) under different plant densities and sowing dates in Ahwaz city, an experiment was carried out in a split plot arrangement based on randomized complete block design with three replications in Khuzestan ...
Read More
In order to study the yield and some physiological characteristics of borage (Borago officinalis L.) under different plant densities and sowing dates in Ahwaz city, an experiment was carried out in a split plot arrangement based on randomized complete block design with three replications in Khuzestan Ramin Agriculture and Natural Resources University, Iran during 2016-2017. The treatments included sowing date as main plot in five levels (15 October, 5 November, 25 November, 15 December and 5 January) and plant densities as sub-factor in four levels (6, 10, 14 and 18 plant per m2) were considered. The results showed that delayed sowing (5 January) caused anincreased temperature at flowering stage and significantly reduced the grain yield and biological yield (182.22 and 1443.4 kg ha-1, respectively). The sowing dates of 5 November at a density of 10 plants/m2 caused the highest grain yield and oil yield with average values of 1243.82 and 437.47 kg ha-1, respectively. The sowing date of 15 October at a density of 14 plants/m2 caused the highest chlorophyll a and total chlorophyll content with average values of 1.13 and 3.39 mg/g fw, respectively. A delay in sowing date from 15 October to 5 January led to a decreased relative leaf water content, cell membrane stability and chlorophyll content. High plant density per m-2 increased the plant height and biological yield and reduced the oil percentage. Sowing date had significant effects on all traits expect oil percentage.
S. Kiani; S.A. Siadat; M.R. Moradi Telavat; A. Poshtdar
Abstract
The study was carried out to assess the effects of humic acid and irrigation cut on yield, yield component and water use efficiency of three fennel ecotypes (Foeniculum vulgare L.) at the reproductive stages. The study was carried out in Agriculture and Natural Resources Science University of Khuzestan ...
Read More
The study was carried out to assess the effects of humic acid and irrigation cut on yield, yield component and water use efficiency of three fennel ecotypes (Foeniculum vulgare L.) at the reproductive stages. The study was carried out in Agriculture and Natural Resources Science University of Khuzestan in a factorial split plot based on randomized complete block design with three replications during 2016-2017. Irrigation regimes (complete irrigation, irrigation cut from flowering stage, irrigation cut from grain filling stage) and foliar application of humic acid (no application and foliar application of 400 mg.l-1) were placed in main plots by a factorial arrangement, and three ecotypes (Isfahan, Hamadan, Bushehr) were placed in sub plots. The results showed that the highest plant height (157.86 cm) was obtained from complete irrigation and Esfahan ecotype (153.6 cm). The highest number of sub branches (10.14) was obtained by foliar application of humic acid and Esfahan ecotype (10.16). The irrigation cut from flowering stage caused reduced thousand grain weight. The highest umbel per umbrella (24.52), grain yield (1876.95 kg.ha-1) and irrigation efficiency (531.99 grams per cubic meter) were obtained under complete irrigation with foliar application of humic acid. The highest number of umbrella was obtained from Bushehr ectype under complete irrigation conditions. Generally, Bushehr ecotype with complete irrigation and foliar application of humic acid is recommended in terms of higher grain yield, yield components and irrigation efficiency.