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ارتباط بین اشکال پتاسیم با ویژگیهای فیزیکوشیمیایی و تنوع کانیهای رسی برخی از خاکهای خوزستان | ||
تحقیقات آب و خاک ایران | ||
مقاله 11، دوره 50، شماره 7، آذر 1398، صفحه 1721-1733 اصل مقاله (819.02 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2019.274818.668112 | ||
نویسنده | ||
سیروس جعفری* | ||
دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران | ||
چکیده | ||
آگاهی از اشکال مختلف پتاسیم و توزیع آن در خاکهای مختلف میتواند به مصرف بهینه کودهای پتاسیم کمک نماید. پژوهش حاضر با هدف بررسی اشکال مختلف پتاسیم در خاک و همبستگی آنها با ویژگیهای فیزیکی و شیمیایی و کانیهای رسی خاک انجام گردید. نتایج نشان داد که میزان پتاسیم محلول با میزان رس رابطه معکوس و میزان پتاسیم تبادلی و قابل جذب با میزان رس رابطه مستقیم داشت. میزان پتاسیم تثبیت شده نیز به نوع و مقدار رسها در خاک بستگی داشت. پتاسیم ساختمانی با میزان آهن و میزان رس در خاک، رابطه مثبت و معنیداری نشان داد اما با میزان گچ در خاک رابطه منفی داشت. پتاسیم کل بنابه همبستگی که با میزان رس داشت با میزان آهن، آلومینیم و سیلیس نیز که اجزاء اصلی تشکیل دهنده رسها میباشند، نیز همبستگی بالایی داشت. میزان پتاسیم خاک به میزان زیادی با افزایش کانیهای ایلیتی رو به فزونی بود ولی وجود پالیگورسکایت یا کلریت زیاد در خاک با کاهش میزان پتاسیم در خاک همراه بود. نتایج نشان داد که میزان پتاسیم با وجود گچ، آهک و ماده آلی و بدون حضور این مواد در مناطق حاوی گچ مثل امیدیه، رامهرمز و هفتکل تفاوت قابل ملاحظهای داشت. عمده تفاوت در میزان پتاسیم خاک به نوع کانیهای رسی (متأثر از مواد مادری)، اثرات آبیاری سنگین، جذب گیاهی و میزان گچ مرتبط بود که سبب میشد کانی رسی ایلیت تا حدودی در خاک کاهش یابد. | ||
کلیدواژهها | ||
پتاسیم؛ تثبیت؛ رهاسازی؛ رس؛ کانی شناسی | ||
مراجع | ||
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