Maryam Makkizadeh Tafti; Ruzbeh Farhoudi; Mohammad Rastifar; Kamal Asilan
Volume 18, Issue 4 , September 2012, , Pages 569-577
Abstract
This study was conducted to study the effect of seed dormancy breaking on seed germination of Caper (Capparis spinosa L.), in a completely randomized design with four replications. Treatments of seed dormancy breaking in Caper included: untreated seeds (control), scarification with concentrated sulphuric ...
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This study was conducted to study the effect of seed dormancy breaking on seed germination of Caper (Capparis spinosa L.), in a completely randomized design with four replications. Treatments of seed dormancy breaking in Caper included: untreated seeds (control), scarification with concentrated sulphuric acid for 20 minutes, soaking in gibberellic acid (500 and 1000 ppm), Potassium Nitrate (0.3%), leaching for 12 hours and combined treatment (leaching for 12 hours and soaking in gibberellic acid (500 and 1000 ppm), leaching for 12 hours and soaking in Potassium Nitrate and scarification with sulphuric acid and soaking in gibberellic acid (500 and 1000 ppm). The results showed significant differences among seed dormancy-breaking methods. According to the results, the highest seed germination percentage of caper was observed in combined treatment (leaching for 12 hours and soaking in gibberellic acid 1000 ppm (98%) and leaching for 12 hours and soaking in gibberellic acid 500 ppm (75%). Our results showed that the treatment of seed leaching for 12 hours reduced the formation of mucilage around the seed and caused an increase in seed germination. Moreover, application of gibberellic acid or Potassium Nitrate could be just useful when the mucilage concentration of the seed coat is reduced by leaching.
Abolghasem Dadrasi Sabzevar; Mohammad Khosroshahi
Volume 17, Issue 1 , September 2010, , Pages 127-148
Abstract
Low quality flood irrigation are used on desert area of KaleShoor river of Sabzevar since 1992. The main objective of this research was to asses changes in soil salinity affected by low quality flood irrigation. To meet this, 51 soil samples were taken and tested in the laboratory for salinity and indicators ...
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Low quality flood irrigation are used on desert area of KaleShoor river of Sabzevar since 1992. The main objective of this research was to asses changes in soil salinity affected by low quality flood irrigation. To meet this, 51 soil samples were taken and tested in the laboratory for salinity and indicators require. soil samples taken from depth of 0-30cm, 30-60cm and 60-90cm at the beginning, middle and end of the cultivated rows of the land. Three soil samples were also prepared from the control area. The results showed that EC and PH values reduced in all samples, compared with control points. In addition, organic materials and sand particles which carried by flood water, improved the soil structure and texture of the study area. This study also showed that flood irrigation has been able to reduce gypsum from range of root zone and transported to lower layers.
Mohammad ali Meshkat; Mohammad hadi Rad; Seyed Reza Hoseini
Volume 14, Issue 4 , February 2008, , Pages 447-454
Abstract
Higher evaporation compared to precipitation in arid zones causes upward movement of soil water and consequently salts will be accumulated in root zone. Since Salt moves with water flow, salt distribution will fallow a pattern similar to soil water distribution. The amount of applied water or leaching ...
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Higher evaporation compared to precipitation in arid zones causes upward movement of soil water and consequently salts will be accumulated in root zone. Since Salt moves with water flow, salt distribution will fallow a pattern similar to soil water distribution. The amount of applied water or leaching fraction is one of the most important and effective factors on salt movement and distribution in soil. This research was established at Yazd Desert Research Station in weighting lysimeters. Salt profile in soils of three hrrhgation treatments : FC, 1/3 FC and no irrigation were plotted and compared with each others for three times (t1 , t2 and t3) in this research. In addition soil moisture was also controlled in different ways. The experhment was done in a completely randomized design and Duncan's test was used for comparison of means. Results indicated that soil salinity increased from top soil to deeper layers and this feauture was more significant in fully irrigated treatments specially at the latest times (t2 and t3). Total accumulated salt was also more at more irrigated treatments. High salinity of water and inadequate of leaching ,were the most important factors which led to salt accumulation in the deep layers of fully irrigated lysimeters.