Effect of salinity and deficit irrigation on some ions uptake by rapeseed (Brassica napus L.) under two planting methods

Document Type: Full Article

Authors

Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- In this study, effect of deficit irrigation with different salinity levels and planting methods (in-furrow and on-ridge) on nutrient and toxic ions uptake by rapeseed was investigated in a two-year experiment. The experiment was conducted at Research Station, located in the College of Agriculture, Shiraz University, I.R. of Iran. Results indicated that an increase in water stress level decreased uptake of potassium (K), calcium (Ca), sodium (Na) and chloride (Cl) by plant and with exception of K, those uptakes were enhanced by an increase in salinity of water and soil. Furthermore, a decrease in applied water decreased the threshold of Na in soil for seed yield reduction. Deficit irrigation had a significant effect on slope of the fitted line between Cl in plant (Clp) and Cl in soil. The Clp threshold for seed yield reduction was significantly different for two planting methods in full irrigation regime so that seed yield reduction occurred in higher Clp in in-furrow planting method. Also, a decrease in applied water decreased Clp threshold for seed yield reduction.

Keywords

Main Subjects


Article Title [Persian]

اثر شوری و کم آبیاری بر جذب برخی عناصر توسط کلزا

Authors [Persian]

  • علی شعبانی
  • علیرضا سپاسخواه
  • علی اکبر کامگار حقیقی
بخش مهندسی آب، دانشکده کشاورزی، دانشگاه فسا، فسا، ج. ا. ایران
Abstract [Persian]

در این تحقیق اثرات کم آبیاری و شوری آب آبیاری و روش کاشت (داخل جویچه و روی پشته) بر جذب یون های سمی و مغذی توسط کلزا در یک آزمایش دو ساله مورد بررسی قرار گرفت. کم آبیاری موجب کاهش جذب پتاسیم، کلسیم، سدیم و کلر توسط گیاه گردید و به استثناء پتاسیم جذب این عناصر تحت تاثیر شوری آب و خاک افزایش یافت. کاهش مقدار آب آبیاری موجب کاهش حد آستانه کاهش عملکرد در اثر جذب سدیم گردید. کم آبیاری اثر معنی داری بر شیب خط رابطه بین غلظت کلر در گیاه و غلظت کلر در خاک داشته است. در تیمار آبیاری کامل، حد آستانه غلظت کلر در گیاه برای کاهش عملکرد در دو روش کاشت تفاوت معنی داری با یکدیگر داشته است بطوری که کاهش عملکرد دانه در روش کاشت داخل جویچه در مقایسه با کاشت روی پشته در غلظت بیشتری از کلر در گیاه اتفاق افتاده است. حد آستانه کاهش عملکرد در اثر غلظت کلر در گیاه با کاهش مقدار آب آبیاری کاهش یافته است.

Keywords [Persian]

  • کم آبیاری
  • شوری آب آبیاری
  • روش کاشت
  • کلزا
  • شوری
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