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Showing 9 results for Rahemi

M. Rahemi, H. Zare,
Volume 6, Issue 2 (summer 2002)
Abstract

Experiments were conducted to evaluate the effects of heat and cold treatments on the disinfestation of dry figs from Estahban. Tow types of packing bags (with or without holes), two storage conditions including one at 23oC and one cold storage condition (10oC and 2oC), 9 heat and cold treatment durations (3, 4, 5, 6, 7, 10, 15, 20 and 25 hrs) and 13 temperature treatments [23, 45, 55, 60, 65, 70, 75, 45+(-25), 50+(-25) and 60+(-25) oC] were used in these experiments. The results showed that Indian meal moth, Plodia interpunctella, which is a major pest in dry fig storage, can be satistfactorily controlled by packing figs in plastic bags with a thickness of 0.24 mm after suitable temperature treatment. Cold storage at 2oC significantly controlled all developmental stages of moths at storage. Temperature treatments at 60oC for 7hrs or more, at 65oC for 6hrs or more, and at -25oC for 15hrs or more were found to be capable of controling pest most satisfactorily without changing fruit external quality.
M. Sayyari, M. Rahemi,
Volume 6, Issue 4 (winter 2003)
Abstract

‘Golden Delicious’ apples were vacuum infiltrated (250 mm Hg) with 0, 4, and 6% solutions of CaCl2 followed by heat treatment for 0, 48 and 72 hours at 38oC. Treated fruits were stored at 0oC with RH of 85-90% for 2.5 and 5 months, followed by one week of storage at 20C. The results showed that fruits treated with 4 and 6% of CaCl2 significantly increased calcium content of fruits after 2.5 and 5 months of storage at 0oC. With increasing calcium content, fruit firmness also increased. There was a positive relationship between fruit firmness and calcium content and regression coefficients after 2.5 and 5 months of storage at 0oC were 0.77 and 0.83, respectively. Heat treatment for 48 and 72 hours at 38oC significantly increased fruit firmness. Calcium chloride at 4 and 6%, plus heat treatment, significantly increased fruit firmness of those fruits held for one week at 20oC after removal from cold storage. In the second experiment, vacuum infiltrated fruits with 4 and 6% solutions of CaCl2 plus potassium permanganate (0, 10, and 20 g/bag) had no significant effect on fruit firmness, but potassium permanganate alone significantly increased fruit firmness.
M. Rahemi, A. Haj Abdollahi,
Volume 8, Issue 1 (spring 2004)
Abstract

Experiments were conducted during 1996-1997 in Nough of Rafsanjan to evaluate double pollination on fruit set and development of pistachio nut. In the first experiment, Owhadi cultivar was pollinated by a combination of pollen from Beneh (P. mutica F&M), Atlantica (P. atlantica Desf) and Soltani (P.vera L.). In the second experiment, Owhadi cultivar was pollinated by pollen from Beneh, Atlantica and Khinjuk (P. Khinjuk). The results showed that in the double pollination experiment, the nut, kernel and fruit set were affected more by the first pollen than by the second one. Pollen from the wild pistachio species reduced kernel weight, number of split nuts but increased percentage of the deformity and blank nuts in Owhadi. It was concluded that the effectiveness of the first pollen on fruit set, nut and kernel development was independent of the second one. The pollen of P. vera proved to be the best pollen source for pistachio cultivars.
Z. Pakkish, M. Rahemi,
Volume 9, Issue 3 (fall 2005)
Abstract

Green skin (hull) of pistachio fruits is a barrier against the penetration of fungi and insects into the kernel of pistachio. Splitting of husk facilitates the entry of fungi and infection of pistachio kernels during the harvest. So far no effective way has been reported for controlling this problem. To evaluate the effects of gibberellic acid on hull spliting the present research was conducted in a commercial orchard of pistachio during 2001-2002 in Rafsanjan, Iran. Gibberellic acid (GA3) at 0,25,50 and 100 mg –1 was applied on 25-year-old of “Owhadi” pistachio cultivar. Two branches of each tree was sprayed during two years of study. GA3 at 25,50 and 100 mg –1 significantly reduced hull splitting and penetration by Aspergillus spp. into pistachio fruits. There was a positive correlation between the hull splitting and fungi penetration (r=0.92*). The exocarp, mesocarp and endocarp of pistachio fruits cultured on selective medium of Aspergillus spp. showed no infection of pistachio kernel by Aspergillus spp. The highest concentration of aflatoxin was detected in the kernel of non-treated fruits (6.25 ppb) and the lowest (0.5 ppb) fruits treated by GA3 . GA3 reduced husk slippery of pistachio fruits at harvest. The rate of husk slippery was reduced by increasing the concentration of GA3. Gibberellic acid treatments had no significant effect on dehiscence, weight of 100 fruits, total soluble solids, but significantly increased fat and chlrophyll content of kernel of pistachio fruits. The results of the study is recommended for commerical pistachio production in Iran.
J. Amiri, M. Rahemi,
Volume 10, Issue 3 (fall 2006)
Abstract

This research was conducted to investigate the changes of GA3-like substances in the stratified (0, 10, 20, 30 days at 10oC) and non-stratified seeds of two olive cultivars, namely ‘Arbequina’ and ‘Zard’. In the first experiment stratified seeds of these cultivars (10 g) were extracted with ethanol (80%), purified by ethyl acetate, and then separated by thin layer chromatography (TLC). To compare the biological activity of separated zones, lettuce hypocolyl assauy was used. The results obtained in this part of study indicated that the amount of GA3-like substances increased as the stratification period increased. In the second experiment extracts were made from different parts of non-stratified seeds of both cultivars. The result of the second experiment showed that the GA3–like substances of embryos of non-stratified seeds were higher than other parts of the seed.
A. Ramezanian, M. Rahemi,
Volume 10, Issue 4 (winter 2007)
Abstract

To evaluate the effects of chemical and hand fruit thinning on pistachio flower bud retention, experiments were conducted during 1382 and 1383. In the first year, ethephon treatments at the concentrations of 100 and 200 mg L-1, urea at 2.5% and 5%, naphthaleneacetic acid (NAA) 125 and 250 mg L-1 and naphthaleneacetamide (NAD) 250 and 500 mg L-1 were sprayed on two branches of nine uniform trees with four replications. During the second year, hand fruit thinning treatments were used in addition to the previous treatments. Chemical treatments reduced flower bud abscission among them ethephon treatments were the most effective on flower bud retention. As compared with other treatments, hand thinning treatments had also positive effect on flower bud retention. Fruit thinning also increased kernel weight, reduced the number of nuts per ounce and decreased blank fruits. Fruit thinning had no significant effect on the yield of branches during ‘on’ year.
R. Mohammad Zadeh, M. Rahemi,
Volume 11, Issue 1 (spring 2007)
Abstract

To evaluate the effects of heat treatments on sprouting weight, loss and other charactristics of two potato cultivars (Agria and Diamont) in cold (9±1) and ambient (18±1) storage, a series of experiments were conducted in 2004. In this study, after curing, the tubers of both cultivars were treated with warm air, at 25, 35, 45 and 57oC for 4, 8 and 12 h and with warm water at 22, 54 and 57 for 15 and 30 min. Treated tubers were packed in net bags and were kept in cold and ambinent storage for 2 and 4 months. The results of the study indicated that warm air at 45oC for 8 and 24 h and warm water at 57oC for 15 min. in comparison to control reduced the percentage of tuber sprouting significantly, without internal changes in tubers composition.
S. Rastegar , M. Rahemi,
Volume 11, Issue 42 (winter 2008)
Abstract

  Navel oranges and Clementine mandarin are classified as early cultivars and when fruits are left on the trees, fruit firmness and juice content will decrease. Plant growth regulators have been used to improve fruit quality. Gibberellic acid (GA3) and 2,4-D isopropyl ester sprays were used to increase juice content ,peel firmness and delay senescence in Navel oranges and Clementine mandarin. Factorial experiments were arranged in a complete randomized block design with three replications and each block consisted of three trees. Chemicals were sprayed on the branches (north and south of each tree) with 10 liter sprayer to the point of run-off during fall of 2004 and 2005 ,in a commercial orchard in Jahrom in the south east of Fars province, Iran . In both years of study, GA3 at 100,150 and 200 mgl-l and isopropyl ester 2,4-D at 8,12 and 24 mgl-1 were sprayed on September 30 (diameter of Navel 64 mm and diameter of Clementine 46 mm), October 14 (diameter of Navel 69 mm and diameter of Clementine 48 mm ) and November 7 (diameter of Navel 70 mm and diameter of Clementine 50 mm) and fruits of Navel oranges and Clementine mandarin were harvested 45 and 35 days after last the spray treatment, respectively . The results of experiment revealed that Navel oranges responded better with second application (Oct.14, diameter 69 mm ) and Clementine mandarin with the first application (Sept.30, diameter 46 mm ). Juice content and fruit firmness at harvest increased. GA3 increased juice content even better than 2,4-D isopropyl ester but delayed senescence, 2,4-D was more effective in increasing fruit sizing in both cultivars. GA3 at 150 and 200 mgl-1 and 2,4-D at 24 mgl-1 when compared with the untreated resulted in highest juice content of fruits.


Z. Karimi , M. Rahemi,
Volume 12, Issue 45 (fall 2008)
Abstract

Pathogens are the most important factors inducing postharvest losses on citrus fruit. Experiments were conducted as a CRD with 4 replications on sweet lime (Citrus limetta) and Valencia orange (Citrus sinensis) in 2003 and 2004. Treatments were pure essential oils of clove and thyme and in 25% ethanol solution at concentrations of 0.1, 0.3 and 0.5% and imazalil (2 ml/l). Results indicated that in the first year, pure essential oils of clove and thyme reduced the decay percentage of blue mold of Valencia orange fruit from 90 % (control) to 0 and 12.5 %, respectively. Pure essential oils of clove and thyme reduced the decay percentage of sweet lime in the first year of experiment from 95 % (control) to 0 and 6 %, respectively. In the second year, with the same treatments decay percentage of blue mold was reduced from 90 % (control) to 0. Solutions of 0.1, 0.3 and 0.5 % of clove and thyme oil extracts in 25 % ethanol solution reduced decay percentage of sweet lime fruits form 85 % (control) to 65, 41 and 26 % for thyme oil and to 60, 30 and 22.5 % for clove oil. Comparison of pure clove and thyme oil extract with imazalil showed that pure clove and thyme oil extracts were not significantly different with fungicide treatment. Treatments of clove and thyme oils in 25 % ethanol treatment were not as effective as fungicide.

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