ABSORPTION OF ATMOSPHERIC NO_2 BY PLANTS AND SOILS : (I) Quantitative Estimation of Absorbed NO_2 in Plants by ^<15>N Method
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概要
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Tomato, sunflower and corn plants were grown in culture solution containing three different concentrations of ^<15>N-labelled KNO_3 (260 ppm N, 105 ppm N, and 26 ppm N) as a nitrogen nutrient, and fumigated with 0.3 ppm NO_2 for 2 weeks during their vegetative stages. The amount of NO_2 nitrogen absorbed into the plants was estimated by "difference method" and "^<15>N method." "^<15>N method" was found to give more probable values than "difference method." According to "^<15>N method, " the nitrogen derived from NO_2 was about 16%(tomato), 22% (sunflower), and 14% (corn) of the increased amount of total nitrogen in the whole plants in the 105 ppm N plot, and these percentages increased in the 26 ppm N plot. Difference in nitrogen concentration of the culture solution resulted in big change in the dryweight increase of the tomato and sunflower plants, but the absorption rate of NO_2 nitrogen based on the dry weight changed slightly. The absorption rate of NO_2 nitrogen was around 0.8 mg (gDW)^<-1> day^<-1> in tomato and sunflower plants, and 0.3 mg (gDW)^<-1> day^<-1> in corn plant. Leaves were found to be an active sink of NO_2 and the nitrogen of NO_2 seemed to be rapidly transformed into compounds of high molecules in the leaf cells.
- 社団法人日本土壌肥料学会の論文
著者
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Totsuka Tsumugu
Division Of Environmental Biology National Institute For Environmental Studies
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Yoneyama Tadakatsu
Division Of Environmental Biology National Institute For Environmental Studies
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MATSUMARU Tsuneo
Chiba-ken Agricultural Experiment Station
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SHIRATORI Koji
Chiba-ken Agricultural Experiment Station
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Shiratori Koji
Chiba-ken Agricultural Experiment Station:(present Address)chiba Prefectural Research Institute For
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Shiratori Koji
Chiba Agricultural Experiment Station
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Matsumaru Tsuneo
Chiba Prefect. Agric. Exp. Stn.
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