Emission of NO2 Gas Causing Damage to Plants in an Acid Soil under Conditions Favorable for Denitrification

다국어 초록 (Multilingual Abstract)

Nitrogen dioxide (NO2) gas damage on vegetable crops commonly occurs in plastic film houses where relatively large amounts of NO3- are applied in acid soils. In acid soils, HNO2 can be formed from the NO2- accumulated during denitrification, and NO2 can be evolved from the chemical self-decomposition of HNO2. In this study, NO2 gas production and its detrimental effects on plants were investigated in soils of various conditions to elucidate the mechanisms involved in the gas production. A silty loam soil was amended with NO3- (500 mg N kg-1) and glucose, and pH and moisture of the soil were adjusted respectively to 5.0 and 34.6% water holding capacity (WHC) with 0.01 M phosphate buffer. The soil was placed in a 0.5-L glass jar with strawberry leaf or NO2 gas absorption badge in air space of the jar, and the jar was incubated at 30oC. After 4-5 days of incubation, dark burning was observed along the outside edge of strawberry leaf and NO2 production was confirmed in the air space of jar. However, when the soil was sterilized, NO2 emission was minimal and any visible damage was not found in strawberry leaf. In the soil where water or NO3- content was reduced to 17.3% WHC or 250 mg N kg-1, NO2 production was greatly reduced and toxicity symptom was not found in strawberry leaf. Also in the soil where glucose was not amended, NO2 production was significantly reduced. In soil with pH of 6.5, NO2 was evolved to the level causing damage to strawberry leaf when the soil conditions were favorable for denitrification. However, compared to the soil of pH 5.0, the NO2 production and its damage to plants were much less serious in pH 6.5. Therefore, the production of NO2 damaging plants might be occurred in acid soils when the conditions are favorable for denitrification.

참고문헌 (Reference)

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