Bohloul Abbaszadeh; Masoumeh Layeghhaghighi; Samaneh Asadi Sanam; Meysam Ansari
Abstract
Objective: Water deficit stress, permanent or temporary, limits the growth and distribution of natural vegetation and the performance of cultivated plants more than any other environmental factors.Methods: To investigate the effect of water absorption, drought stress and chemical fertilizers on Mint, ...
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Objective: Water deficit stress, permanent or temporary, limits the growth and distribution of natural vegetation and the performance of cultivated plants more than any other environmental factors.Methods: To investigate the effect of water absorption, drought stress and chemical fertilizers on Mint, this experiment was conducted in 2019 at the Research Institute of Forests and Rangelands, in Karaj, Iran. The experiment was conducted as a split factorial experiment in the form of a randomized complete block design with three replications. The main factor was water absorption in two levels (use and no use) and the sub-factors were drought stress in three levels (90%FC, 60%FC and 30%FC) and chemical fertilizers (nitrogen and phosphor) in four levels (N0P0, N0P150, N300P0 and N300P150 kg/ha).Results: A mean comparison of the interactions of the super adsorbent treatments with stress and chemical fertilizers indicated that the highest leaf yield was achieved with the use of super adsorbent*90%FC*N300P0. Application of super adsorbent*90%FC*N0P150 had the highest inflorescence yield. A mean comparison of the interaction between super adsorbent, drought stress and chemical fertilizers indicated that the highest leaf essential oil percentage (2.9 %) was achieved in the treatment without super adsorbent*30%FC*N300P150. The use of super adsorbent*90%FC*N0P150 had the highest leaf essential oil yield. Mean comparison of the interaction between super adsorbent, drought stress and chemical fertilizers indicated that the highest inflorescence essential oil percentage and yield with the average of 10.2 % and 30.3 kg/ha, respectively, were achieved in the treatment without super adsorbent*90%FC*N300P0.Conclusion: Results indicated that mint is sensitive to water deficiency and sufficient moisture is necessary for its production.
Samaneh Asadisanam; Mohsen Zavareh; Hematolah Pirdashti; Fatemeh Sefidkon; Ghorban Ali Nemat Zadeh
Abstract
Purple conefloweras top-selling medicinal plant is widely used in Europe and North America for the treatment of common cold. This experiment was conducted as a randomized complete block design in split plot arrangement with three replications in Research Farm of Genetics and Agricultural Biotechnology ...
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Purple conefloweras top-selling medicinal plant is widely used in Europe and North America for the treatment of common cold. This experiment was conducted as a randomized complete block design in split plot arrangement with three replications in Research Farm of Genetics and Agricultural Biotechnology Institute of Tabarestan in 2012-13. Experimental treatments included three transplanting dates (April 9, May 9 and June 8, 2013), and three plant population densities (7, 10 and 16 plant/m2) which considered as main and subplots, respectively. Results showed a relative compensatory effect of higher population density until 10 plants/m2, however, delayed planting resulted to decrease in total shoot, leaf (L) and stem (S) dry weights. It represents that the highest flower (F) dry weight (27.1 g/plant) was related to planting on May 9 with 10 plant/m2 density. Ratio of L/shoot was greater than S/Shoot than F/shoot dry weight. The highest (L+F)/Shoot ratio was related to the April and May planting dates while the highest S/Shoot ratio was related June’s planting date. Maximum total phenol content of leaves (51.1 mg of GAE/ g dry matter) and stems (35.9 mg of GAE/ g dry matter) were measured in plants cultivated on April 9 with a density of 10 plant/m2. The highest total phenolic content of flowers (56.5 mg of GAE/ g dry matter) was determined in plants cultivated on May 9 with a density of 10 plant/m2. Total phenol of flowers was greater in leaves than stems. Overall, it could be concluded that early planting of purple coneflower on April 9 with 10 plant/m2 density was suitable for leaf and stem dry weight and total phenol production, while the delayed planting until May 9 with a population density of 10 plant/m2 was favorite for flower as production of dry weight and total phenol, according to the experiment conditions