جستجوی مقالات مرتبط با کلیدواژه "خراش دهی شیمیایی" در نشریات گروه "منابع طبیعی"

This research was done in order to find the most effective treatment to break the hardness of Persian camelthorn (Alhagi camelorum) seeds, which is one of the major problems of its cultivation on a large scale. treatments including 98% sulfuric acid (treatments of 25, 30 and 35 minutes) and 100°C hot water (treatments of 30 seconds, 1 and 3 minutes) were performed in comparison with the control. The factorial experiment was conducted in the form of a completely randomized design. The results showed that the populations had significant differences in terms of all traits and the difference between seed hardness treatments and their interaction effects for all traits was significant at the 1% level. The results of the findings show that the presence of the hard shell is a physical barrier and it acts as factors limiting germination by preventing the expansion of the embryo or by limiting water absorption and gas exchange. Therefore, applying a series of seed scratching treatments such as sulfuric acid treatment and 100°C water will improve the germination of the camelthorn seed. Because the use of treatments such as sulfuric acid involves problems such as the risk of working with acid, and also due to the cheapness and availability of water, the lack of special facilities and materials, the harmlessness and simplicity of working with it to stimulate germination and remove hardness, 100 °C water for 30 seconds and placement of seeds in 30 °C germinator is the priority for treating Iranian seeds.

Present study was conducted to evaluate the effects of chemical scarification (Sulphuric acid 97% for 0, 3, 6 and 9 h at 25°C), removal of endocarp and cold stratification (0, 21 and 31 days at 10°C) treatments on percentage and rate of seed germination of olive cultivars (Koroneiki, Zard and Shenghe). A factorial experiment was used based on a completely randomized design with three replications. Results indicated that the chemical scarification treatments and removal endocarp followed by an adequate stratification period can increase seed germination significantly. The best results obtained by removal endocarp treatments. The highest germination percentage of cv. Koroneiki obtained after Cold stratification treatments for 21 days (up to 93%). The best result for cv. Shenghe and cv. Zard observed following Cold stratification treatments for 31 days (85.55% and 84.44 respectively). The highest germination percentage of cv. Koroneiki obtained after 97% sulfuric acid solution treatments for 6 h (49.67%). Treating seeds of this cultivar by 97% sulfuric acid for longer period resulted in damage to embryo and no seedlings emerged after these treatments. The best result for cv. Shenghe observed following 97% sulfuric acid treatment for 9 h (42.34%) cv. Zard observed following 97% sulfuric acid treatment for 6 h (40.23%). The least germination rate and percentage was observed in control treatments. Growth of olive seedlings also increased by scarification, removal endocarp Cold stratification treatments significantly. Results suggested that removal endocarp and chemical mechanical scarification treatments can improve germination percentage and seedling growth of olive cultivars.