Can We Reduce Salinity Effects by the Application of Humic Acid on Native Turfgrasses in order to Attain Sustainable Landscape?
محورهای موضوعی : مجله گیاهان زینتیElham Saeedi Pooya 1 , Ali Tehranifar 2 , Mohammadsadeqe sadeqi 3 , Navid Vahdati Mashhadian 4
1 - PhD. Student of Ornamental Plant, Department of Horticultural Science and Landscape, Ferdowsi University of Mashhad, Mashhad, Iran
2 - Professor, Department of Horticultural Science and Landscape, Ferdowsi University of Mashhad, Mashhad, Iran
3 - Faculty of Agriculture, Tabriz University, Tabriz, Iran.
4 - Msc. of Horticultural Science, Faculty of Agriculture, Tabriz University, Tabriz, Iran
کلید واژه: Quality, Uniformity, Color, texture, Turf,
چکیده مقاله :
Soil salinity is one of the most important problems in dry and semi-dry climate areas of the world. So, we investigated the effects of humic acid on visual quality and quantity parameters of native turfgrasses in compared to commercial one under salinity stress to explore can we reduce salinity effects by humic acid or not? So, an experiment was arranged in factorial experiment based on randomized complete design with three replications. The first factor was three grasses consist of two native accessions of Lolium perenne ҅Chadeganʼ and ҅Yarandʼ and its commercial variety, the second factor was four concentrations of humic acid (HA) (0, 5, 10, 15 g kg-1) and the third factor consisted of three levels of salinity (0, 150, 300 mM). Results of analysis of variance indicated that the interaction effects of cultivar × HA was significant in all traits (P<0.01) except uniformity and height. The treatment of cultivar × salinity significantly affected color, texture, smoothness, uniformity and RWC (P<0.01) and total quality (P<0.05). Treatment of HA × salinity had not significant influence on smoothness and uniformity but other traits were significantly influenced at 5% probability level and RWC at 1% level. Triple interaction effect was significant on texture, quality after clipping, uniformity and RWC (P<0.01) and height (P<0.05). Application of HA could decreased salinity effect on darkness, texture and increased quality after clipping and relative water content of leaves under salinity stress. Also, increasing of severity of salinity had reduction effect on plant height and total quality even with HA application. In conclusion, plants grow on soils which contain adequate humic acids (HA) are less subject to stress condition, are healthier because of having higher relative water content in contrast salinity condition.
شوری خاک یکی از مهم‌ترین مشکلات در مناطق خشک و نیمه خشک جهان است. بنابراین به بررسی اثرات اسید هیومیک بر یک-سری صفات کمی و کیفی چمن های بومی در مقایسه با رقم تجاری، تحت شرایط شوری پرداخته شد تا بررسی شود ایا میتوان اثرات شوری را با هیومیک اسید تعدیل کرد یا خیر؟ بنابراین ازمایشی در قالب فاکتوریل با طرح پایه کامل تصادفی با سه تکرار انجام شد. فاکتور اول، سه نوع چمن که دو توده بومی لولیوم پرنه چادگان و یارند در مقابل رقم تجاری آن قرار گرفت. فاکتور دوم چهار غلظت اسید هیومیک (15، 10، 5، 0 gr/kg خاک) و فاکتور سوم سه سطح شوری (0، 150 ، 300 میلی مولار) بود. نتایج آنالیز واریانس بیان میکند که اثر متقابل رقم در اسید هیومیک بر روی تمام صفات در سطح یک درصد معنی دار شد به جز صفات یکنواختی و ارتفاع. همچنین تیمار رقم در شوری اثر معنا داری بر روی رنگ، نرمی، یکنواختی و محتوی نسبی رطوبت برگ در سطح یک درصد و کیفیت کل در سطح 5 درصد، گذاشت. تیمار اسید هیومیک و شوری نیز بر نرمی و یکنواختی تاثیر معنا داری نداشته اما بر سایر صفات در سطح احتمال 5 درصد و بر محتوی نسبی رطوبت برگ در سطح یک درصد معنا دار شد. اثر متقابل سه گانه تیمارها هم بر روی بافت، کیفیت پس از سرزنی، یکنواختی و محتوی نسبی رطوبت برگ در سطح یک درصد و بر ارتفاع در سطح 5 درصد معنا دار شد. کاربرد اسید هیومیک توانست اثر شوری را بر تیرگی رنگ چمن و بافت کاهش دهد و از طرفی نیز باعث افزایش کیفیت پس از سرزنی و محتوی نسبی رطوبت برگ در شرایط شوری شد. همچنین افزایش شدت شوری اثر کاهنده ای بر روی ارتفاع و کیفیت کل حتی با کاربرد اسید هیومیک داشت. به عنوان نتیجه گیری کلی، رشد گیاه در خاکهای حاوی اسید هیومیک کافی، کمتر تحت تاثیر شرایط استرس‌زا قرار میگیرد که میتواند بدلیل داشتن محتوی رطوبت نسبی بالا برخلاف شرایط شوری است.
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