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برآورد شاخصهای مختلف تنش آبی ذرت علوفهای جهت مدیریت کمآبیاری | ||
| تحقیقات آب و خاک ایران | ||
| دوره 52، شماره 8، آبان 1400، صفحه 2181-2190 اصل مقاله (1.13 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2021.324536.668985 | ||
| نویسندگان | ||
| محدثه کردی1؛ علی حیدر نصرالهی* 2؛ مهری سعیدی نیا2 | ||
| 11- دانشجوی کارشناسی ارشد، گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی،دانشگاه لرستان، خرم آباد، ایران. | ||
| 2استادیار گروه مهندسی آب،گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی،دانشگاه لرستان، خرم آباد، ایران. | ||
| چکیده | ||
| مدیریت کمآبیاری یکی از راهکارهای مؤثر جهت افزایش بهرهوری آب در مناطق خشک و نیمه خشک است. با توجه به اینکه در کمآبیاری گیاه در معرض تنش آبی است لذا بررسی وضعیت تنش آبی گیاه امری ضروری است. هدف از این پژوهش بررسی وضعیت تنش آبی ذرت علوفهای تحت سطوح مختلف آبیاری با استفاده از نمایههای مختلف خاک و گیاه است. از این رو تحقیقی در قالب طرح بلوکهای کامل تصادفی با چهار سطح آبیاری؛ (I50، I75، I100 و I125) در دانشکده کشاورزی دانشگاه لرستان اجرا گردید. نتایج نشان داد که تأثیر سطوح مختلف آبیاری روی شاخصهای CWSI، RWC، KS، رطوبت باقیمانده خاک، عملکرد محصول و بهرهوری آب در سطح اطمینان یک درصد معنیدار بود. شاخص CWSI از 18/0 در تیمار I125 به مقدار 47/0 در تیمار I50 افزایش یافت. شاخص محتوای نسبی آب برگ(RWC) نیز با کاهش میزان رطوبت خاک از 68 درصد در تیمار I125 به 42 درصد در تیمار I50 رسید. بیشترین و کمترین مقدار متوسط ضریب تنش آبی(KS) در طول دوره رشد مربوط به تیمارهای I50 و I125 به ترتیب معادل 32/0 و 94/0 بدست آمد. همچنین با کاهش50 درصد نیاز آبی گیاه میزان عملکرد نسبت به شرایط آبیاری کامل حدود 42 درصد کاهش داشت و تیمارهای I100 و I50 به ترتیب با مقادیر 75/2 و 53/2 کیلوگرم بر متر مکعب دارای بیشترین و کمترین میزان بهرهوری آب بودند. در این تحقیق رابطه بین عملکرد محصول و شاخصهای CWSI، RWC، KS و رطوبت باقیمانده خاک () با همبستگی بالایی حاصل گردید. در نهایت میتوان بیان کرد که شاخصهای تنش آبی قابلیت بررسی تنش آبی در گیاه ذرت علوفهای را دارند. | ||
| کلیدواژه‌ها | ||
| رطوبت خاک؛ نیاز آبی؛ CWSI؛ RWC | ||
| عنوان مقاله [English] | ||
| Estimation of Different Water Stress Indices of Forage Maize for Deficit Irrigation Management | ||
| نویسندگان [English] | ||
| mohadeseh kordi1؛ Ali hedar Nasrollahi2؛ Mehri Saeidinia2 | ||
| 1Master student, Department of Water Science and Engineering, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran. | ||
| 2Assistant Professor, Department of Water Engineering, Department of Water Science and Engineering, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran. | ||
| چکیده [English] | ||
| One of the effective ways to increase water productivity in arid and semi-arid regions is Irrigation management. Due to the fact that the plant is exposed to water stress in low irrigation, so it is necessary to study the water stress status of the plant. The purpose of this study is to investigate the water stress status of forage maize in different irrigation levels using different soil and plant indices. Hence a study in the form of a randomized complete block design with four levels of irrigation; (I50, I75, I100 and I125) were performed in the Faculty of Agriculture of Lorestan University. The results indicated that different levels of irrigation on CWSI, RWC, KS and residual soil moisture, crop yield and water productivity affect significantly at confidence level of one percent. The CWSI index increased from 0.18 in I125 treatment to 0.47 in I50 treatment. Decrease in soil moisture content from 68% in I125 treatment to 42% in I50 treatment, decreased the value of relative leaf water content index (RWC). The highest and lowest mean values of water stress coefficient (KS) during the growth period related to I50 and I125 treatments were 0.32 and 0.94 respectively. Also, with a 50% reduction in plant water requirement, the yield compared to full irrigation conditions decreased by about 42% and treatments I100 and I50 with values of 2.75 and 2.53 kg / m3, respectively, had the highest and lowest water productivity. In this study, the relationship between crop yield and indices of CWSI, RWC, KS and residual soil moisture () was obtained with a high correlation.Finally, it can be said that in water stress in forage maize can be investigated through water stress indices. | ||
| کلیدواژه‌ها [English] | ||
| Soil moisture, Water requirement, CWSI, RWC | ||
| مراجع | ||
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