mohammad reza malekzadeh shamsabad; Majid Esmaeilizadeh; Hamidreza roosta; fatemeh nazoori
Abstract
In soilless culture, lack of correct management in fertigation causes stress in plants due to restricted root volume and low water holding capacity of substrate. The present study aimed to assess managing the fertigation practice and foliar application of potassium sulfate in soilless culture of strawberry ...
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In soilless culture, lack of correct management in fertigation causes stress in plants due to restricted root volume and low water holding capacity of substrate. The present study aimed to assess managing the fertigation practice and foliar application of potassium sulfate in soilless culture of strawberry cv. paros. A factorial experiment was conducted with two factors including fertigation frequency at three levels (1, 4 and 10 times per day) and foliar application with potassium sulfate at three levels of concentration (0 as control, 1 and 2 g/L). The experiment was carried out based on a complete randomized design with three replications in Vali-e-Asr University of Rafsanjan. Results indicated that increasing the fertigation frequency up to four times a day led to a significant increase in dry weight of shoot and root, number of fruits, concentration of chlorophyll a and b, leaf relative water content and leaf Ca and Mg content. The highest values of leaf area, fruit weight, number of inflorescence as well as potassium and iron content of leaf and root were obtained by 10 times of fertigation per day. Potassium sulfate foliar application with concentration of 1 g/L had the most effect on leaf area as well as shoot, root and fruit dry weight, vegetation index increased in plants treated with 2 g/L potassium sulfate compared with those without any foliar application treatment. The highest content of leaf soluble carbohydrates belonged to the plants treated with once-a-day fertigation and foliar application of 2 g/L potassium sulfate.
Majid Esmaeilizadeh; Azam Lotfi; Seyyed Hossein Mirdehghan; Mohammad Hossein Shamshiri
Abstract
In order to investigate the effects of irrigation intervals on pigments and biochemical components of four grapevine cultivars (Yaghooti-e-Ghermez, Askari, Sahebi and Keshmeshi-e-Sefid), an experiment was conducted with five irrigation treatments (3, 6, 9, 12 and 15 days interval) in four replications ...
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In order to investigate the effects of irrigation intervals on pigments and biochemical components of four grapevine cultivars (Yaghooti-e-Ghermez, Askari, Sahebi and Keshmeshi-e-Sefid), an experiment was conducted with five irrigation treatments (3, 6, 9, 12 and 15 days interval) in four replications in greenhouse in 2012. The results of this experiment showed that irrigation intervals have effected on physiological and biochemical factors of grapevine cultivars. The amount of chlorophyll a, b and total chlorophyll in four cultivars were reduced with increasing irrigation intervals, and maximum reduction was observed in 15 days interval irrigation in four cultivars. The maximum and the minimum of chlorophyll a, b, total chlorophyll and carotenoids content were observed in ‘Sahebi’ at 6 days interval irrigation and ‘Askari’ at 15 days, respectively. Total soluble sugars, phenolic compounds and proline contents of leaves in all cultivars increased and leaf relative water content decreased with increasing diurnal irrigation. The maximum leaf relative water content and proline was observed in Sahebi cultivar and the minimum value was belonged to Yaghooti-e-Ghermez and Askari cultivars. Based on the results of this study, it seems that Sahebi cultivar had more tolerant in increasing irrigation intervals compared to Yaghooti-e-Ghermez, Askari and Keshmeshi-e-Sefid cultivars.
Majid Esmaeilizadeh; mohammadreza pourrajabi nejad; Hamid Reza Karimi; Aliakbar Mohammadi Mirik
Abstract
To investigative the effect of benzyladenine and eliminate of irrigation in winter on vegetative growthparameters and chemical composition of tree and nut quantitative characteristics of pistachio trees cv.Kaleh-Ghoochi, an experiment was done in 2010 to 2012 years. In this study, the effect of two irrigationregimes ...
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To investigative the effect of benzyladenine and eliminate of irrigation in winter on vegetative growthparameters and chemical composition of tree and nut quantitative characteristics of pistachio trees cv.Kaleh-Ghoochi, an experiment was done in 2010 to 2012 years. In this study, the effect of two irrigationregimes includes irrigation and non-irrigation in winter combined with three levels of benzyladenine (0,20 and 40 mg L-1) was investigated. The experiment design was randomized complete block design withthree replications. The data obtained from both experiment analyzed as the combined analysis. Irrigationtreatment was done as similar as common irrigation program in orchard, and in non- irrigation treatment,there wasn’t irrigation from January to April in both years. Application of benzyladenine treatment wasdone at inflorescence buds swollen time. The results showed, 40 mg L-1 benzyladenine had the mosteffective on vegetative growth of trees compared with the other treatments. Also benzyladeninetreatments compared with the control had significant increase in the ecophysiological parameters; leavesbiochemical compounds contents, leaves nutrient elements concentration and caused reducing inpercentage of early splitting fruit and bud abscission significantly. Also, results showed that eliminationof irrigation in winter had no significant effect on the mentioned parameters. Thus, based on the results ofthis study it seems that elimination of winter irrigation doesn’t have any effect on vegetative growth anddevelopment of pistachio tree, but application of BA in late winter has positive effects.