نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار مهندسی منابع آب دانشکده کشاورزی دانشگاه ملایر

2 دانشیار گروه مهندسی آب دانشکده کشاورزی دانشگاه بوعلی سینا

3 استادیار گروه خاک دانشکده کشاورزی دانشگاه ملایر

چکیده

در این تحقیق، آزمایشی بهصورتفاکتوریلوبرپایه طرحکاملاًتصادفیدر یک خاک لومی شنی تحت کشت سیبزمینی با نرم­افزار هایدروس با دو فاکتور نوع کود نیتروژن در 4 سطح (اوره، نانوکی­لیت نیتروژن، نانوکی­لیت نیتروژن گوگرددار و اوره با پوشش گوگردی) و مقدار نیتروژن در 3 سطح (46، 92 و 138 کیلوگرم نیتروژن در هکتار) صورت گرفت. نتایج برازش مدل فروندلیچ بر داده­های نیترات خاک نشان داد که این مدل در هر سه سطح کود مصرفی با کمترین مجموع مربعات (SSQ)، داده­های تیمارهای نانوکی­لیت نیتروژن و نانوکی­لیت نیتروژن گوگرددار را توصیف می­نماید. بیشترین مقدار ضریب Kd فروندلیچ در سطح 46 کیلوگرم نیتروژن به کود نانوکی­لیت نیتروژن معادل 14/0، در سطح 92 کیلوگرم معادل 17/0 به کود نانوکی­لیت نیتروژن و در سطح 138 کیلوگرم نیتروژن برابر 19/0 به­دو کود نانوکی­لیت نیتروژن و نانوکی­لیت نیتروژن گوگرددار تعلق داشت. ضمن آن­که افزایش مقدار کود مصرفی در همه تیمارها منجر به افزایش ظرفیت جذب نیترات خاک شد. نتایج شبیه­سازی حرکت نیترات نشان داد که کمترین مقدار خطا (07/0= NRMSE) و بیشترین ضریب تبیین (999/0 = R2)، به­سطح 138 کیلوگرم نیتروژن در هکتار مربوط به تیمار کود نانوکیلیت نیتروژن گوگرددار بود. بالاترین NRMSEو کمترین R2در شبیه­سازی حرکت نیترات هر سطح تیمارهای کودی به تیمار کود اوره تعلق داشت. در مجموع نتایج نشان داد استفاده از نانو کودهای نیتروژن باعث شستشوی کمتر نیترات و افزایش نگهداشت آن در خاک می­شود. 

کلیدواژه‌ها

عنوان مقاله [English]

A Study of Nitrate Uptake of Four Nitrogen Frtilizers and its Movement Simulation in Sandy Loam Soil by Hydrus-1D

نویسندگان [English]

  • Maryam Bayat Varkeshi 1
  • Hamid Zare Abyaneh 2
  • Shahriar Mahdavi Mahdavi 3

چکیده [English]

In this study, a factorial experiment based on completely in a sandy loam soil under potato cultivation by Hydrus-1D with two factors of nitrogen fertilizer type in 4 levels (Nano- Nitrogen Chelate (NNC), Sulphur Coated Nano- Nitrogen Chelate (SNNC), Sulphur Coated Urea (SCU) and Urea (U)) and nitrogen amount in 3 levels (46, 92 and 138kg-N/ha) was desighned. The results of Freundlich fiting on soil nitrate showed that this model in each three nitrogen levels describes with minimum SSQ NNC and SNNC treatments. The maximum Kdin the 46 kgN/ha belonged to NNC (0.14), in the 96 kgN/ha pertained to NNC (0.17) and in the 138 kgN/ha belonged to NNC and SNNC (0.19). Furthermore, increasing using firtilizer in all treatments led to increasing sorption capacity. The simulation results indicated that the minimum NRMSE=0.07 and maximum R2=0.999 pertained to 138 kgN/ha SNNC. The maximum NRMSE and the minimum R2 belonged to Urea treatment. Overall this study results displayed using nano nitrogen firtilizers leads decreasing nitrate leaching and increasing its keeping in soil.

کلیدواژه‌ها [English]

  • Freundlich
  • NNC
  • SCU
  • Urea
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