ali naderi arefi
Abstract
In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split ...
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In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split plots with three replications. The main plots are the planting dates (May 22 and Jun 5, 2020) and five cultivars, i.e. Khorshid, Kashmar, Sajedi, Hekmat, and Khordad serve as the sub plots. The results show that location effect on vegetative and reproductive attributes has been significant. UNR boosts the yield in Aradan, but in Varamin region, this planting method, not only has failed to increase the yield, but has reduced it significantly. This is due to reducing the boll number as a result of rank growth of plants in UNR system. Reduction of row spaces from 75 to 25 cm enhances the number of monopodials, sympodials, and plant height. In Varamin, plant height of all cultivars are higher than 119 cm. the highest yield in this region obtained from Khordad as Control (3886 kg seed ha -1). The highest yield in Aradan, obtained from Khorshid (5702.5 kg seed ha -1) in UNR system. This shows that the UNR planting of zero type varieties is more adabtable for Garmsar condition than that of Varamin.
Babak Bahreininejad; Ali Ashraf Jafari; Zahra Jaberalansar
Abstract
This study was carried out to compare growth characteristics of three species of Alyssum minus, A. szwitsianum and A. desertorum over two years, 2017 and 2018, in a randomized complete block design with three replication at Isfahan Agricultural and Natural Resources Research and Education Center. Measured ...
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This study was carried out to compare growth characteristics of three species of Alyssum minus, A. szwitsianum and A. desertorum over two years, 2017 and 2018, in a randomized complete block design with three replication at Isfahan Agricultural and Natural Resources Research and Education Center. Measured traits were yield characteristic including total dry weight, leaf, stem, root and seed dry weight; morphological characteristics including plant height, maximum and minimum plant diameter, plant cover and stem number; and phenolological characteristics including day to flowering, day to seeding and day to seed ripening. The highest biological and seed yield were achieved in A. minus, 1003 and 375 kg/ha respectively, while A. desertorum showed the lowest rates, 559 and 207 kg/ha respectively. Morphological traits analysis represented that A. minus had the highest rates of plant height, stem number, plant diameter and cover. A. minus and A. desertorum with 101 and 95 days to seed ripening were the longest and shortest lifelong species. The highest correlation rates between seed yield with other characteristics were including biological yield (0.90), plant height (0.79), stem number (0.76) and cover (0.75). On the whole, results of this study showed that A. minus showed the highest yield potential among the studied species.
Hosein Sadeghi; Mona Karbalaie; Hamid Hadizade
Abstract
The limequat is a citrofortunella hybrid that is hybrid between the key lime and the kumquat. It has considerable amount of vitamin C acids which tastes similar to limes. Regarding these traits and it's relatively resistance to low temperatures. It can be a new commetrial citrus in thenorth of sour lemin ...
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The limequat is a citrofortunella hybrid that is hybrid between the key lime and the kumquat. It has considerable amount of vitamin C acids which tastes similar to limes. Regarding these traits and it's relatively resistance to low temperatures. It can be a new commetrial citrus in thenorth of sour lemin trees in Mazandaran weather condition severely damaged by frost. Rootstocks had main affect on scion, such as vegetative vigority, tolerance to biotic and abiotic stresses, yields and fruit quality. The objective of this experiment was to evaluate of citrage, citromelo and sour orange rootstocks on the vegetative growth, tree size and mineral absorption ability of limquate. The experiment was conducted in a compeletly randomized design with seven replications. The results showed that the rootstock had significant effect on all parameters except the leaves numbers. The highest amount of chlorophyll (4.84 mg /100 gr) and plant stem diameter (7.07 mm) were observed on the citrange rootstocks plant. Limequats plants on sour orange (91 cm) and citrange (90 cm) rootstocks had vertical growth with better height but lime quat scion produced the most side branches on the citromello rootstock (5.8). The highest and the lowest percentage of water relative content were observed on sour orange rootstock (62.84%) and citrange rootstock (54.60%). In terms of nutrient absorption (nitrogen, phosphorus, potassium, calcium, iron, magnesium and manganese) significant effects were observerd between root stocks; the ability of citromello rootstock to absorb magnesium and manganese was less than other rootstock. In conclusion, citrange rootstock can be a suitable rootstock for Limequat in Mazandaran weather conditions.
Fariba Rezaei Aderyani; Ayatollah Rezaei; Yavar Sharafi
Abstract
Salinity is one of the most important plant growth limiting factors, which using the anti-stress materials is considered as an important approach in moderating its effects on plants. In this research, the date plum seedlings response to salinity stress and two compounds putrescine and chitosan to reduce ...
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Salinity is one of the most important plant growth limiting factors, which using the anti-stress materials is considered as an important approach in moderating its effects on plants. In this research, the date plum seedlings response to salinity stress and two compounds putrescine and chitosan to reduce salinity stress was studied. The experiment was conducted as a factorial with three levels of sodium chloride (0, 30 and 60 mM), and five treatments of control, putrescine (1 and 2 mM) and chitosan (0.25 and 0.5%), based on a completely randomized design with four replications at Shahed University in 2016. The results showed that date plum was sensitive to salt stress in the early stages of growth and sodium chloride salinity stress resulted in significant decrease in vegetative traits such as fresh matter weight and length of shoots and roots as well as leaf chlorophyll content in compared to 0 salinity. In addition, the leaf blight percentage, sodium content, electrolyte leakage and malondialdehyde content were increased in plants treated with salinity. Putrescine treatment, especially at 2 mM concentration effectively reduced the effects of salinity on date plum seedlings and improved vegetative growth of stem and root, while chitosan had no significant effect in reducing the harmful effects induced by salt stress in this experiment. According to the results, Diospyros lotus seedlings were sensitive to salinity and using treatments such as putrescine is effective in increasing its resistance to salinity stress.
Mohsen Seilsepour; Ahmad Golchin; Mohammad Reza Rouzban
Abstract
A greengouse experiment was conducted to evaluation of salinity stress on growth parameters of two olive cultivars during 2013-2014 at Agricultural and Natural Resources Research Center of Tehran. In the experiment, effects of five levels of irrigation water salinity including 0, 4, 8, 12 and 16 dS.m-1 ...
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A greengouse experiment was conducted to evaluation of salinity stress on growth parameters of two olive cultivars during 2013-2014 at Agricultural and Natural Resources Research Center of Tehran. In the experiment, effects of five levels of irrigation water salinity including 0, 4, 8, 12 and 16 dS.m-1 were evaluated on ʻZardʼ and ʻMissionʼ olive cultivars under soilless culture. Data showed that salinity had significant effects on all growth parameters in both olive cultivars. Leaf dry weight, shoot and root dry weight, leaf chlorophyll index, shoot and root tolerance index, shoot and internodes length, leaf area, leaf number and leaf relative water content were affected by salinity and significantly decreased. These reductions were more in ʻZardʼ comparing to ʻMissionʼ. Shoot dry weight, leaf dry weight and root dry weight were decreased 80, 80 and 69 percent, respectively at 16 dS.m-1 salinity treatments with compare to control. Leaf sodium (Na+) concentration and rate of sodium to potassium (K+) in leaf were increased and leaf potassium concentration was decreased by salinity. Increase of Na+ and decrease of K+ were more in ʻZardʼ comparing to ʻMissionʼ. Also, leaf and shoot dry weight were affected by concentration of Na+, K+ and Na+: K+ in leaf and there were a significant correlation among these parameters with leaf and shoot dry weight. Results indicated that ʻMissionʼ variety were more salt tolerance than ʻZardʼ.
Meysam Mohammadi; Mehdi Saidi; Orang Khademi; Masoud Bazgir
Abstract
In order to study the effects of GA3and CaCl2 treatments in resolve the problems of sweet pepper culture in Ilam region (including small size fruits with sunscald and blossom end rot disorders), this study was carried out in Ilam University in 2012. For that, GA3 (50 mg/l) and CaCl2 (0.5%) treatments ...
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In order to study the effects of GA3and CaCl2 treatments in resolve the problems of sweet pepper culture in Ilam region (including small size fruits with sunscald and blossom end rot disorders), this study was carried out in Ilam University in 2012. For that, GA3 (50 mg/l) and CaCl2 (0.5%) treatments were sprayed at two (fruit set and 15 days thereafter) and three (fruit set, 10 and 20 days thereafter) times on the ‘California Wonder’ peeper and after ripening fruit characteristics were investigated. The results showed that, in most of the studied traits, there were no significant differences between two and three spraying times. However, GA3 in comparison to control, significantly increased yield, fruit number, marketability, fruit diameter, fruit weight, flesh firmness, fruit dry matter, ascorbic acid content, antioxidant capacity, chlorophyll content, plant height, internodes length, leaf area and lateral branch number and decreased sunscald and blossom end rot rates. CaCl2 treatment as compared to control increased fruit dry matter, flesh firmness, fruit thickness, chlorophyll b and total chlorophyll content, and reduced sunscald and blossom end rot. However, CaCl2 treatment had no significant effects on vegetative properties, including stem height, shoot diameter, internodes length, leaf area, lateral branch number, as well as fruit size and yield. According to these results, application of both GA3 and CaCl2 treatments can be effective in improving the qualitative and quantitative properties of sweet pepper.