بررسی اثر استفاده از سه نوع پلیمر سوپر جاذب بر میزان جذب برخی عناصر غذایی پرمصرف تحت شرایط تنش خشکی در آکاسیا

خشکی یکی از مهم‌ترین تنش‌های غیر زنده است که وضعیت تغذیه‌ای گیاه را تحت تاثیر قرار می‌دهد. از متداول‌ترین راهکارهای تحمل به تنش خشکی استفاده از پلیمرهای سوپر جاذب است. پلیمرهای سوپر جاذب تجاری مواد هیگروسکوپی شبیه شکر هستند که شکل این پلیمرها پس از جذب آب و تورم باید حفظ شود این پلیمرها آب را جذب و ذخیره می‌کنند و در مواقع نیاز به آسانی در اختیار گیاه قرار می‌دهند و ضرری برای انسان، خاک، گیاه و محیط ندارند. به منظور بهبود وضعیت تغذیه در آکاسیا پژوهشی با استفاده از سه نوع پلیمر سوپر جاذب در سه غلظت در سه سطح تنش خشکی به صورت فاکتوریل در قالب طرح بلوک کاملاً تصادفی درمزرعه دانشکده کشاورزی دانشگاه شهید چمران اهواز انجام گرفت. نتایج نشان داد که استفاده از پلیمرهای سوپرجاذب میزان جذب نیتروژن، پتاسیم و فسفر برگ، ساقه و ریشه را به طور معنی‌داری افزایش می‌دهند. غلظت 2 گرم در کیلوگرم هیدروژل a200 در هفته اول موجب افزایش 12.85 درصدی نیتروژن برگ، 17.64 درصدی فسفر برگ، 50.29 درصدی نیتروژن ساقه و 4.96 درصدی نیتروژن ریشه گردید. سوپر جاذب snf در هفته اول دارای بیشترین میزان پتاسیم ساقه و فسفر ریشه بود و در هفته دوم دارای بیشترین میزان فسفر در ساقه بود. بر اساس نتایج این پژوهش استفاده از پلیمر سوپر جاذب a200 نسبت به بقیه هیدروژل‌ها بیشترین تاثیر را بر وضعیت تغذیه‌ای گیاه و جذب عناصرنیتروژن (n)، فسفر (p) و پتاسیم (k) داشت.

investigating the effect of using three types of superabsorbent polymers on n.p.k absorption under drought stress conditions.

introduction acacia with the scientific name acacia salicina is a tree or shrub from the leguminous family and a nitrogen fixer. this species is native to dry areas in southern australia. in some areas, this species is used as a source of fodder for livestock, for ornamental purposes, and for revival areas without vegetation. climate change is one of the most important concerns of the world's growing population. drought is one of the most important abiotic stresses that affects the nutritional status of plants. stresses constantly affect the growth and development of plants, which are considered the most important factors of yield reduction in the world. stresses are the result of abnormal physiological processes that are caused by one or a combination of biological and environmental factors, and drought is one of the most important abiotic stresses that affect growth and performance, as well as this stress can cause plant death and limits approximately 25% of agricultural production. one of the most common ways to withstand drought stress is the use of super absorbent polymers. commercial superabsorbent polymers are hygroscopic materials similar to sugar, and the shape of these polymers must be maintained after absorbing water and swelling. they don't have harm for soil, plants and environment. considering the increase in temperature and pollution the purpose of this research is the effect of using three types of super absorbent polymers to increase n.p.k. absorption, water retention, reduce irrigation, reduce costs and improve the growth of acacia plants under drought stress conditions for cultivation in areas free of vegetation to contrast with fine dust in khuzestan. materials and methods in order to improve the nutritional status of acacia, a research was conducted using three types of superabsorbent polymers in three concentrations at three levels of drought stress in a factorial format based on completely randomized block design with three replications in the agricultural faculty of shahid chamran university of ahvaz. results and discussion the results showed that the use of superabsorbent polymers significantly increases the amount of nitrogen, potassium and phosphorus absorption by leaves, stems and roots. the concentration of 2 g/kg of a200 hydrogel in the first week increased leaf nitrogen by 12.85%, leaf phosphorus by 17.64%, stem nitrogen by 50.29% and root nitrogen by 4.96%. in the first week, snf superabsorbent had the highest amount of potassium in stem and phosphorus in the root. among the hydrogels, snf superabsorbent polymer had the highest amount of phosphorus in the stem in the second week and a concentration of 1 g/kg, and this increase was significant compared to some treatments. the lowest amount of phosphorus in the stem were obtained s in the treatment of the first week and a concentration of 0 g/kg super absorbent polymer a200 and snf. increasing the concentration of super absorbent polymers increased the amount of phosphorus in the stem in most cases. increase in the intensity