S. Hazrati; Z. Tahmasebi Sarvestani2; A.R. Sadeghi Bakhtoori
Abstract
Aloe barbadensis Miller. is one of the most economically important medicinal plants in many countries of the world. This investigation aimed at evaluating the effects of water stress and zeolite on growth, yield and chemical compositions of A. barbadensis. The study was conducted in the research greenhouse ...
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Aloe barbadensis Miller. is one of the most economically important medicinal plants in many countries of the world. This investigation aimed at evaluating the effects of water stress and zeolite on growth, yield and chemical compositions of A. barbadensis. The study was conducted in the research greenhouse of Faculty of Agriculture, Tarbiat Modares University. The plants were harvested 90, 180 and 270 days after imposing the treatments. Water deficit stress decreased growth, leaf fresh and gel fresh weight and increased biochemical compounds. The results showed that the greatest number of new leaves and pup were produced by the plants irrigated 20% and 40% FC with 8 g zeolite, respectively. Generally, the highest leaf fresh and gel fresh weight were observed 270 days after imposing the treatments when plants were irrigated after depleting 40% of the FC and amendment with 8 g zeolite (624.13 and 397.17 g), respectively. The water use efficiency increased with less water and more zeolite availability. The highest water use efficiency of leaf and gel was obtained from the plants irrigated after depleting 60% of field capacity and treated with 8 g zeolite. In addition, the results indicated that the maximum aloin concentration (23.48%) and proline accumulation (0.85 (mg [g FW]-1) were obtained 90 days after imposing the treatments when the plants were irrigated after depleting 80% and 60% of FC where no zeolite was applied, respectively. Irrigation after 80% depletion of FC without zeolite application resulted in the highest fructose and glucose content, respectively (234.71 and 79.83 mg g DW−1). In general, application of zeolite could alleviate water stress adverse effects, and improved plant growth and yield. Severe water stress decreased leaf yield and plant growth, while caused an increase in biochemical compounds.
S. Maleki Khezerlu; Z. Tahmasebi Sarvestani; S.A.M. Modarres Sanavi
Abstract
To study some quantitative and qualitative traits of Cucurbita pepo L. under fertilizer and water deficit stress, a trial was conducted in the research field of Tarbiat Modares University in 2011 and 2012 cropping years. In this study, the experiment was performed in factorial randomized completely block ...
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To study some quantitative and qualitative traits of Cucurbita pepo L. under fertilizer and water deficit stress, a trial was conducted in the research field of Tarbiat Modares University in 2011 and 2012 cropping years. In this study, the experiment was performed in factorial randomized completely block design with three replications. and water deficit at three levels (normal irrigation, withholdingirrigation at milk stage, withholdingirrigation and spraying sodium chlorate at milk stage). Results showed that nitrogen fertilizer treatment significantly affected all traits studied except seed number and stress treatment had significant effects on all traits except seed number, seed length, and stearic acid content at 1% level of significance. In this study, increasing water stress reduced the content of all traits studied except linoleic acid content. In addition, increased levels of nitrogen fertilizer led to the decreased content of all traits studied. The highest values for fruit and seed weight, seed width, seed diameter, oil, linoleic, oleic, palmetic, and stearic acid were obtained at a nitrogen fertilizer level of 60kg.ha-1. Totally, nitrogen fertilizer (60kg.ha-1) and control irrigation treatments are recommended as the most suitable treatments to gain maximum seed yield.
S. Hazrati Yadekori; Z. Tahmasebi Sarvestani
Abstract
Aloe vera L. is one of the most important medicinal plants in the world mostly cultivated due to its economic and medicinal value. In order to study the effects of different levels of nitrogen fertilizer and benzyl adenine hormone (BA) on growth and ramet production of Aloe vera L. a factorial experiment ...
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Aloe vera L. is one of the most important medicinal plants in the world mostly cultivated due to its economic and medicinal value. In order to study the effects of different levels of nitrogen fertilizer and benzyl adenine hormone (BA) on growth and ramet production of Aloe vera L. a factorial experiment was carried out based on a complete randomized blocks design with four replications in an experimental greenhouse of Faculty of Agriculture, Tarbiat Modares University. Treatments included four levels of nitrogen fertilizer (N1: control, N2: 500, N3: 1000, and N4: 1500 mg per pot) and four levels of benzyl adenine (BA) (BA1: Control, BA2: 500, BA3: 1000, BA4: 1500 mg/L). At the end of the experiment period, plant height, stem diameter, number of ramets, number of leaf ramet, ramet weight, ramet height and total biomass were measured. The results showed that application of 1000 mg nitrogen and 1000 mg/L benzyl adenine had the most effect on the growth factors. Also, application of 1500 mg nitrogen and 1500 mg/L benzyl adenine had the highest effect on ramet characteristics. However, ramet number increased with increment of BA concentration and the highest ramet number was obtained on 1500 mg BA spray treatment without nitrogen application. According to the results, simultaneous application of 1000 and 1500 mg nitrogen and 1000 and 1500 mg\L benzyl adenine had the most influence on the measured factors.
