
J. Jpn. Soc. Soil Phys.
#x
No. +*,, p. 1 +1 ,**0
  *Di#erence in N Transformations in Various Types of Soils,
and E#ect of Applied Organic Materials on N Dynamics
Takashi NISHIO* National Agricultural Research Center for Tohoku Region, . Akahira,Shimo-kuriyagawa, Morioka, Iwate *,*ῌ*+32, Japan
Abstract
Di#erence in N transformations in . types of soils, and e#ect of applied organic materials on N
transformations were investigated in experiments using +/N as a tracer.

The rates of nitriﬁcation

and N immobilization were conspicuously di#erent by the soil types, and the total amount ofimmobilized N in each soil was predictable by using the rates of nitriﬁcation and immobilization
determined by the incubation experiments.
The organic materials such as dried hog feces and wheat straw enhanced N immobilization by
microorganisms, which resulted in depressing N absorption by crops as well as mitigating the riskof nitrate leaching.

It was demonstrated quantitatively that combined use of chemical fertilizer

and organic materials did not always diminish the amount of nitrate leaching due to comparatively large amount of applied N in comparison with the sole application of chemical fertilizer.
Key words : N immobilization, Nitriﬁcation, +/N, soil type, organic materials

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13

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de Willigen, P. (+33+) : Nitrogen turnover in the soil
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Maeda, M., Zhao B., Ozaki Y. and Yoneyama, T. (,**-) :Soil Sci. Plant Nutr. .2 : -*1ῌ-+-.

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soils by chemical and biological processes. Soil
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Vereecken, H., Jansen, E. J., Hack-ten Broeke, M. J.D.,

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chopped maize plants, barley straw and blue

Soil and Groundwater Research Report II (CEC

grass in the ﬁeld. Soil Biol. Biochem., -* : /0+ῌ/1+.

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