Effect of Gypsum and Polyacrylamide Application on Erodibility of an Acid Kunigami Mahji Soil

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概要

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• Calcium carbonates and gypsum are often used to improve the chemical status of acid soils. This study discusses the effects of gypsum and polyacrylamide (PAM) application on infiltration and erodibility of a Japanese acid soil. Acid Kunigami mahji soil (sedimentary rock derived, Typic Hapludult) from Okinawa was packed into an acrylic plastic box, and simulated rainfall of 40mm h^<-1> was applied. Prior to the rainfall, 2.5 t ha^<-1> of gypsum and/or 15 kg ha^<-1> of non-ionic or anionic PAM were applied onto soil surface. During a rainfall, surface runoff was collected periodically, and sediment concentration, pH, and electric conductivity of the runoff were measured. Gypsum application enhanced surface runoff. During the rainfall, EC of the runoff was greater than the critical coagulation concentration of the clays of the mahji soil, however the soil became dispersive with gypsum application. PAM application could improve infiltration of gypsum amended mahji soil and reduce sediment loss.

• 社団法人日本土壌肥料学会の論文

著者

• Suzuki Sozo

  Tokyo University Of Agriculture And Technology

• YAMAMOTO Tahei

  Arid Land Research Center, Tottori University

• Yamamoto Tahei

  Arid Land Research Center Tottori University

• Kato Makoto

  Tokyo Univ. -Ag. & Tech. Agr.

• Nishimura Taku

  Tokyo University of Agriculture and Technology

• Kato Makoto

  Tokyo University Of Agriculture And Technology

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