بررسی اثر کم‌آبیاری تنظیم شده وخشکی بخشی ریشه بر خصوصیات دانه برنج و جذب نیتروژن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری آبیاری و زهکشی، گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری.

2 استاد گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری

3 استاد گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری.

4 استادیار پژوهش موسسه تحقیقات برنج کشور –معاونت آمل.

چکیده

به‌منظور ارزیابی برخی خصوصیات فیزیکی و کیفی دانه برنج و میزان جذب نیتروژن در سطوح مختلف­آبیاری، مطالعه‌ای در معاونت مؤسسه تحقیقات برنج کشور در مازندران طی دو سال زراعی 1394و1395 انجام گردید. تیمارها شامل دو روش کم­آبیاری تنظیم شده(RDI)  و خشکی بخشی ریشه (PRD) در کشت جو ­و پشته با سه سطح تنش خشکی  DI10)، PRD10، DI30، PRD30،DI60  ،(PRD60 به‌همراه غرقاب دایم (FI) به­عنوان تیمار شاهد، در سه تکرار انجام گردید. طبق نتایج هردو سال پارامترهای عملکرد، آب مصرفی، راندمان تبدیل، درصد خرد، درصد آمیلوز، غلظت ژل، دمای ژلاتینه شدن و مقدار جذب نیتروژن در تیمارهای مختلف با یکدیگر اختلاف معنی­دار داشته است. بر این اساس اگرچه بیشترین عملکرد در تیمار غرقاب دایم به‌دست آمد، اما متوسط کاهش عملکرد در تیمار PRD10 دو درصد بوده است، در حالی‌که مصرف آب آن 32 درصد کمتر از تیمار شاهد است. طبق نتایج ضریب تبدیل در روش خشکی بخشی ریشه نسبت به غرقاب دایم حدود 5/0درصد افزایش داشته و کمترین درصد خرد در تیمار PRD10 اندازه گیری شد. هم‌چنین تحت تنش ملایم خشکی، صفات کیفی مانند درصد آمیلوز، درجه ژل و دمای ژلاتینه شدن کاهش نداشته است. با افزایش تنش خشکی مقدار جذب ازت در برنج کاهش می­یابد، براین اساس بیشترین جذب نیتروژن هر دوسال در تیمار شاهد به‌دست آمد که مقدار آن به­ترتیب 8/85 و 6/88 کیلوگرم در هکتار بوده است. لذا استفاده از روش خشکی بخشی ریشه در کشت جوی و پشته به‌عنوان یک روش جایگزین در کشت برنج قابل اجرا می‌باشد که بدون کاهش چشم‌گیر در عملکرد و کیفیت برنج، موجب صرفه‌جویی در آب مصرفی می­گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the effect of Regulated Deficit irrigation and Partial Root Dring on some physical and qualitative properties of rice grains and Nitrogen Absorption in furrow cultivation

نویسندگان [English]

  • Mostafa Yosefian 1
  • Ali Shahnazari 2
  • Mirkhalegh Ziatabar Ahmadi 3
  • Behrooz Arabzade 4
  • Mahmood Raeini Sarjaz 3
1 Ph.D. student of Sari University of Agricultural Sciences and Natural Resources
2 Professor Water Engineering Department, University of Agricultural Sciences and Natural Resources of Sari.(
3 Professor, Water Engineering Department, University of Agricultural Sciences and Natural Resources of Sari.
4 Assistant Professor of Rice Research Institute.
چکیده [English]

Due to drought crisis in recent years, the use of alternative cropping methods that saves water without any decrease in yield is increasing. Regulated deficit irrigation is a method of irrigation in which, by supplying part of the maximum crop requirement at specified times, water management is addressed and therefore the root zone is in a dry area most of the time. Using this method will partially stop the growth of the plant and usually decrease yield (Jovanovic et al., 2010). Root Partial Drying (PRD) is a modified form of the deficit, which includes watering one section of the root zone in each irrigation and dry up another side, so the moisture of this section before next irrigation largely come down (Ahmadi et al., 2010). In the root drying method, the roots of the plant simultaneously with soil drying with the production of Abscisic Acid, prevent leaf expansion and reduce stomatal conductance. Simultaneously with this process, the root in the wet part with adequate water uptake puts the plant in proper moisture (Yousri Ibrahim Atta, 2008). Abscisic acid is a plant hormone whose production is increased by root in dry soils and transported by water flow into the stem. (liu et al., 2008). On the other hand, The quality of production is as important in all crops and especially in rice production in Iran. (Salehifar  et al., 2009) In order to evaluate some of the physical and qualitative properties of rice grain and the amount of nitrogen uptake in rice (Hashemi variety) under different irrigation levels and comparing it with continuous waterlogging, an experiment was conducted during two years of cultivation of 2015 and 2016.

کلیدواژه‌ها [English]

  • Rice grain quality
  • Partial Root Drying
  • Furrow Cultivation
  • Dificit Irrigation
  • Nitrogen
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