Journal of Chemical Ecology

, Volume 5, Issue 5, pp 839–859 | Cite as

Autointoxication mechanism ofOryza sativa

II. Effects of culture treatments on the chemical nature of paddy soil and on rice productivity
  • Chang-Hung Chou
  • Su-Jenn Chiou


Ammonium sulfate and potassium nitrate added as a top dressing and rice straw were incorporated into soil to understand their effect on the chemical nature of the paddy soil and on the growth and yield of rice plants during two successive crop seasons. Redox potential (Eh) determination indicated that the paddy soil appeared to be the reduced form in mixture with rice residues. The amounts of ammonium nitrogen (NH4+—N) and nitrate nitrogen (NO3—N) were significantly higher in the second crop than in the first crop, and the quantity of NH4+—N was about 10 times greater than that of NO3—N. The incorporation of rice straw decreased both the available nitrogen and the soil cations, Zn2+, Cu2+, Ca2+, Mn2+, and Na+. The quantity of Zn2+, Cu2+, Mg2+, and Na+ was significantly lower in the second crop that that in the first. The growth and yield of rice plants were significantly affected by cultural treatment; thus the ammonium sulfate dressing treatment resulted in higher yields than the potassium nitrate treatment. The NH4+—N treatment had an antagonistic effect on the phytotoxic nature of rice straw decomposed in soil. The phytotoxicity (primarily phenolic type compounds) of aqueous extracts of soil varied between treatments and was significantly higher in the soil which had been mixed with rice straw. This finding correlated well with the higher amounts of phytotoxic plant phenolics produced by the decomposing rice residues in the soil.

Key words

Allelopathy autointoxication Oryza sativa rice productivity phytotoxicity phytotoxic phenolics top dressing paddy soil chemistry 


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Copyright information

© Plenum Publishing Corporation 1979

Authors and Affiliations

  • Chang-Hung Chou
    • 1
  • Su-Jenn Chiou
    • 1
  1. 1.Institute of BotanyAcademia SinicaTaipeiTaiwan, 115, Republic of China

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