Mahdi Motaefi; Alireza Sirousmehr; Mohsen Mohsen Mousavi nik
Abstract
Drought stress is the most important factor in crop yield reduction. It is important to know how to cope with drought. This experiment is carried out to investigate the effect of organic growth stimulator (Hamoon green) on yield and some physiological indices of safflower under drought stress, during ...
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Drought stress is the most important factor in crop yield reduction. It is important to know how to cope with drought. This experiment is carried out to investigate the effect of organic growth stimulator (Hamoon green) on yield and some physiological indices of safflower under drought stress, during 2017-2018 in university of Zabol (Chahnime) as a split plot, based on RCBD with three replications. Experimental treatments include drought factor based on plant growth stages at three levels (complete irrigation throughout the growing season, irrigation up to terminal bud forms, and irrigation up to completed flowering) and spraying factor of organic growth stimulator at 4 levels (pure water), the foliar application has been Hamoon green 1 liter in 10 liters + calcium, Hamoon green 1 liter in 20 liters + calcium and Hamoon green 1 liter in 30 liters+ calcium. Results show that drought has reduced the height, 1000-seed weight, and oil percentage, by 44.41%, 31.24%, and 17.10%, respectively. Spraying hamoon green 1 liter in 10 liters+ calcium leads to an increase of 18.03%, 13.90%, and 13.74% for the above traits, compared to the control. The highest grain yield (1882.55 kg.ha-1), chlorophyll a, b, total and carotenoids (3.49, 0.94, 4.44, and 7.37 mg.gr-1 fw, respectively), selenium content (5.18 mg.kg-1 fw) and seed calcium content (2.91%) are obtained from hamoon green 1 liter in 10 liter + calcium and complete irrigation treatment. In general, it seems that by spraying 1 liter per 10 liters+ calcium, a good performance can be achieved.
Samaneh Jahanpanah; Mahmoud Ghasemnejad; Younes Ebrahimi
Abstract
Incomplete pollination of kiwifruit flowers could be the main limiting factor which reduces marketable kiwifruit quality. Therefore, at the current study effect of pollen suspension and dry pollen as supplemental artificial pollination were evaluated on characteristics such as fruit size, fruit weight, ...
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Incomplete pollination of kiwifruit flowers could be the main limiting factor which reduces marketable kiwifruit quality. Therefore, at the current study effect of pollen suspension and dry pollen as supplemental artificial pollination were evaluated on characteristics such as fruit size, fruit weight, seed number, dry matter percent, tissue firmness, total soluble solid, and vitamin C content, mineral nutrient elements such as nitrogen, phosphors, potassium, calcium, and magnesium of Hayward Kiwifruit. The results showed that pollination with dry pollen, at the 60% of full bloom stage, increased marketable fruits in compare to other treatments. There are more seed number in these fruits (11% and 5% respectively), which result to increase fruit size, length and diameter as compare to pollen suspension and control. Fruit vitamin C could not affect by pollination, but fruit dry matter of flowers which pollinated at 60% of full bloom was the higher than the other treatments. Supplemental pollination with dry pollen increased fruit calcium, which resulted to improve nitrogen to calcium, potassium to calcium, the sum of potassium and magnesium to calcium, the sum of nitrogen and potassium to calcium ratios. Overall, it seems that supplemental pollination, especially with dry pollen at 60% of full bloom stage, could improve pollination and ovules fertilization. In conclusion, the same fruits have more seed number and strength sink for accumulation assimilate and mineral elements especially calcium. Overall, the profit of supplemental pollination with dry pollen was calculated about 48,800,000 Rials per hectare.
Mohammad Reza Zarea Bavany; Gholamali Peyvast; Mahmoud Ghasemnezhad; Akbar Forghani
Abstract
Salinity is the main limiting environmental factor on plant growth and production. Therefore, finding salinity tolerant cultivars result to increase crop yield and production. However, a factorial experiment was carried out based on randomized complete block design with three replicates in hydroponic ...
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Salinity is the main limiting environmental factor on plant growth and production. Therefore, finding salinity tolerant cultivars result to increase crop yield and production. However, a factorial experiment was carried out based on randomized complete block design with three replicates in hydroponic culture. Two salinity levels (0 and 100mM NaCl) were considered the first factor and 26 greenhouse pepper cultivars was the second. Results showed a significant difference for all studied characteristics. Salt stress decreased all characteristics except to total dry matter percent and sodium concentration. The increase in sodium content accompanied with the decrease in potassium, calcium content and growth indices. Results showed a significant negative correlation between sodium with vegetative indices, potassium to sodium ratio, calcium to sodium ratio in all cultivars. Overall, ‘Paramo’, ‘Efests’ and ‘SPADI’ were known as the most tolerant pepper cultivars. According to finding of this study, the characteristics such as shoot sodium content and stress tolerance index can be used for screening salinity tolerance in pepper cultivars.
Erfan Sepahvand; Mahmood GHasem nejhad; Mohammad Reza Fattahi Moghadam; Alireza Talaei; Mohammad Ali Askari
Abstract
In this study, the effect of foliar spray with calcium chloride (0, 0.75, 1.5 and 3 g L-1) during 2, 4 and 6 weeks before commercial harvesting time of apple fruit cv. ‘Gala’ and ‘Delbarestival’ which trained in three different systems (V shape, HighTech and Cordon) was investigated. ...
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In this study, the effect of foliar spray with calcium chloride (0, 0.75, 1.5 and 3 g L-1) during 2, 4 and 6 weeks before commercial harvesting time of apple fruit cv. ‘Gala’ and ‘Delbarestival’ which trained in three different systems (V shape, HighTech and Cordon) was investigated. The results showed that types of training systems and foliar application of calcium can affect on fruits quality at harvest time. Tree yield, fruits weigh and fruit tissue firmness of ‘Gala’ was significantly higher than ‘Delbarestival’. Furthermore, calcium spray increased fruit firmness in compared to control and TA deacresead in compared to control. Calcium treatment increased fruit skin a* value that means more antocyanin synthesis and redness. Results generally showed that ‘Gala’ apple trained in HighTech and V shape systems as well as ‘Delbarestival’ in HighTech produced the higher fruits weight and size as well as quality favorite in compare to other system.