Period, fumigation

Plant. Based on data collected during a 2-h fumigation period, EC50 values for alfalfa, soybean, wheat, tobacco, and corn were 7.8, 20.1, 23.3, 41.2, and 50.1 mg/m, respectively (Thompson et al., 1979). 

Fourteen day old bean plants (Phaseolus vulgaris L., lot DU15, Burpee Seed Company, Riverside, California) were used in these experiments. Plants were exposed to 0.4 ppm O3 for one hr in a fxmiigation chamber with the procediares and conditions outlined previously (J, ). Samples of the leaves were taken at the end of the fumigation period, and at one, two and four hr intervals after the fumigation period. Control samples for comparison were taken from untreated leaves. The samples were prepared for study with the electron microscope by fixation at... 

Fig. 9. Ten peas periodically fumigated with 90nl/l ozone ( ) the fumigation periods are indicated levels of non-fumigated peas are also shown (o)...

Fig. 9. Effect of SO2 fumigation on productivity and subsequent photosynthetic recovery of an arctic lichen ecosystem. Fumigation occurred in 1978 for a six-day period (after Moser et al., 1983).

Substituting a diird chlorine on the methane molecule results in the compound whose proper name is trichloromediane (tri- for three chloro- for chlorine and methane, the hydrocarbon s name for die one-carbon chain). It is more commonly known as chloroform. Its molecular formula is CHC13. Chlorofonn is a heavy, colorless, volatile liquid with a sweet taste and characteristic odor. It is classified as non-flammable, but it will bum if exposed to high temperatures for long periods of time. It is narcotic by inhalation and toxic in high concentrations. It is an insecticide and a fumigant and is very useful in the manufacture of refrigerants. 

---