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مقایسه چند عصارهگیر برای استخراج پتاسیم قابل جذب برنج در برخی از خاکهای استان کهگیلویه و بویر احمد | ||
تحقیقات کاربردی خاک | ||
مقاله 2، دوره 5، شماره 1، شهریور 1396، صفحه 13-24 اصل مقاله (279.38 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
حمیدرضا اولیایی* 1؛ فاطمه بارونی2؛ ابراهیم ادهمی3؛ مهدی نجفی قیری4 | ||
1هیئت علمی گروه علوم خاک دانشگاه یاسوج | ||
2دانش آموخته ارشد دانشگاه یاسوج | ||
3دانشگاه یاسوج | ||
4دانشکده کشاورزی داراب | ||
چکیده | ||
پتاسیم و نیتروژن دو عنصر غذایی بوده که بیشترین نقش را در افزایش کمی و کیفی برنج ایفا مینماید. این عنصر نیز همانند نیتروژن به مقدار زیادی، توسط گیاه برنج جذب میشود. ارزیابی وضعیت عناصر غذایی در خاک از نقطه نظر تغذیهای، زیستمحیطی و اقتصادی حائز اهمیت است. این تحقیق با هدف مقایسه 11 عصاره گیر مختلف به منظور تعیین عصارهگیرهای مناسب جهت برآورد پتاسیم قابل جذب برنج در 11 نمونه خاک انتخابی (از مجموع 40 خاک) استان کهگیلویه و بویر احمد انجام شد. بذرهای برنج در سه تکرار در گلدانهای یک و نیم کیلوگرمی به مدت 10 هفته کشت و سپس برداشت شدند. میزان پتاسیم گیاه برنج به کمک اسیدکلریک 1 نرمال عصارهگیری شد. پتاسیم قابل جذب خاک به وسیله عصارهگیرهای استات آمونیوم 1 مولار، کلرید سدیم 1 و 2 مولار، اسید سولفوریک 025/0 مولار، کلرید باریم 1/0 مولار، کلرید کلسیم 01/0 مولار، مورگان-ولف، AB-DTPA، استات سدیم 1 نرمال، استات منیزیم 1 مولار و اسیدکلریدریک 2 مولار اندازهگیری شد. بررسی نتایج ضرایب همبستگی عصارهگیرهای مختلف با میزان جذب پتاسیم توسط اندام هوایی گیاه برنج حاکی از آن بود که بیشترین همبستگی با جذب گیاهی مربوط به عصارهگیر استات سدیم و استات آمونیوم بوده (r به ترتیب 85/0 و 73/0) و پس از آنها عصارهگیرهای مورگان و سدیم کلرید 2 مولار قرار دارند. کمترین مقدار همبستگی مربوط به عصارهگیر کلرید کلسیم بوده است. بنابراین عصارهگیرهای استات سدیم و استات آمونیوم به ترتیب با توجه به سادگی و اقتصادی بودن، سرعت عصاره گیری و بالا بودن ضریب همبستگی با جذب توسط برنج جهت تعیین پتاسیم قابل دسترس در خاکهای مورد نظر توصیه میگردند. | ||
کلیدواژهها | ||
برنج؛ خاک؛ پتاسیم قابل استفاده؛ عصارهگیر | ||
مراجع | ||
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