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طاهره رئیسی بیژن مرادی بهروز گلعین

چکیده

پژوهش حاضر با هدف بررسي اثر مکش آب خاک، همراه با پتاسيم بر عملکرد، برخي ويژگي‌هاي بيوشيميايي و رشد رويشي درختان پرتقال تامسون‌ناول روي پايه سيتروملو اجرا شد. بدین­منظور، یک آزمایش فاکتوریل در قالب طرح آماری بلوک کاملاً تصادفی به مدت دو سال در باغ پرتقال اجرا شد. فاکتورها شامل: انجام آبياري در مکش­های رطوبتی خاک 20، 40، 60 كيلو پاسكال (بر اساس مکش تانسیومتر) و یک تیمار بدون آبیاری؛ و کاربرد کود پتاسيم در دو سطح 50 و 100 گرم پتاسيم ضرب‏ در سن درخت در نظر گرفته شد. سپس، در دو سال آخر آزمایش عملکرد، پتاسیم قابل ‏استفاده و قطر تاج درختان و در سال آخر آزمایش، مقدار پرولین، نشت یونی و هدایت الکتریکی خاک اندازه گیری شد. نتايج اين تحقيق نشان داد كه مقدار قطر تاج درختان با انجام آبياري افزايش (05/0P<) يافت. هم­چنین، نتایج سال آخر پژوهش نشان داد که در سطح اول پتاسیم بین مقدار عملکرد در تیمارهای آبیاری 20، 40 و 60 کیلوپاسکال تفاوت معنی­داری (05/0P<) مشاهده نشد. علاوه­براین، اثر پتاسیم بر عملکرد به مکش آب خاک بستگی داشت. هم­چنین، با افزایش مکش رطوبتی خاک در زمان آبياري مقدار پرولين، نشت يوني، پتاسیم قابل‏استفاده و قابلیت هدایت الکتریکی افزايش معني­داري داشتند. به­طور کلی، باتوجه به نتایج عملکرد و نیز با در نظر گرفتن محدويت منابع آبي مي‏توان پيشنهاد کرد كه در مناطق با اقلیم و خاک مشابه با منطقه مور مطالعه، بهترين زمان آبياري درختان پرتقال تامسون‏ناول موقعي است كه تانسيومتر مکش 60 کيلوپاسکال (ضريب تخليه 52 درصد) را نشان دهد. علاوه براین، بهینه­ترین مقدار پتاسيم جهت کوددهی این درختان در شرایط ذکر شده، معادل 50 گرم پتاسيم ضرب در سن درخت می­باشد.

جزئیات مقاله

کلمات کلیدی

آبياري, تانسیومتر, پرولين, سيتروملو, نشت‏ يوني

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ارجاع به مقاله
رئیسیط., مرادیب., & گلعینب. (2018). اثر مکش آب خاک و پتاسيم بر عملکرد و شاخص‌هاي بیوشیمیائی پرتقال تامسون ‌ناول (Citrus sinensis L. Osbeck.). آب و خاک, 32(5), 961-975. https://doi.org/10.22067/jsw.v32i5.70820
نوع مقاله
علمی - پژوهشی