Phosphorus species, fractions, and leaching risk in vermicompost-amended calcareous sandy loam soil

  • سال انتشار: 1402
  • محل انتشار: مجله بین المللی بازیافت مواد آلی در کشاورزی، دوره: 12، شماره: 0
  • کد COI اختصاصی: JR_ROWA-12-0_003
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 190
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نویسندگان

Mahsa Asariha

Department of Soil Science, College of Agriculture, Malayer University, Malayer, Iran

Mahboubeh Zarabi

Department of Soil Science, College of Agriculture, Malayer University, Malayer, Iran

چکیده

Purpose Organic matter has significant effects on phosphorus (P) retention in soil. Applying vermicompost (VC) as an organic amendment is an eco-friendly approach to increase sustainability in agriculture. There is a high potential of P loss by leaching or surface runoff from coarse-textured soils. Column leaching experiments were conducted to determine the effect of VC on P mobility in a P fertilized sandy loam soil­.Method Soil columns were amended with different VC dosages (۲% VC, ۳% VC, and ۵% VC w/w) and leached with distilled water for ۳۱ days. Phosphorus, base cations and anions concentration, EC, and pH were analyzed in leachates and P species, leaching rate, and fractions in amended soils were determined, too.Results The HPO۴-۲ and MgHPO۴ (aq) were the dominant species in the leachates and their highest total concentration was observed in ۵% VC-amended columns. Vermicompost increased P leaching and its leaching rate ranged from ۰.۴۱ mg kg-۱day-۱ for control to ۰.۵۹ mg kg-۱day-۱ for ۵% VC-amended columns. With increasing VC dosage Res–P, NaOH–P, and KCl–P fractions decreased, but the HCl-P fraction increased.Conclusion Results indicate that the VC with increasing moderately labile P fraction (HCl-P) and HPO۴ -۲ and MgHPO۴ (aq) species can enhance P leaching from sandy loam soil­.

کلیدواژه ها

Coarse-textured soil, vermicompost, Phosphorus fraction, leaching

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