H. Pleijel et al., EXPOSURE OF OATS, AVENA-SATIVA L, TO FILTERED AND UNFILTERED AIR IN OPEN-TOP CHAMBERS - EFFECTS ON GRAIN-YIELD AND QUALITY, Environmental pollution, 86(2), 1994, pp. 129-134
Field grown oats, Avena sativa L. cv Vital, were exposed to filtered a
nd unfiltered air from anthesis until harvest in open-top chambers at
a site in south-west Sweden. Ambient plots were used to study the infl
uence of the chamber itself. With the exception of the number of grain
s per panicle, which was significantly higher in the charcoal-filtered
treatment, no significant filtration effects were obtained for any of
the plant growth parameters studied), i.e. grain yield, number of pan
icles per square metre, 1000-grain weight, straw yield and harvest ind
ex). The chamber had a significant negative effect on grain yield, 100
0-grain weight and straw yield. None of the yield quality parameters t
hat were measured, such as crude protein content, crude fibre content,
fat content, volume weight of the grain and water content of the grai
n at harvest, were significantly influenced by either air filtration,
or the presence of the chamber. The chlorophyll content of the flag le
aves was higher in the charcoal-filtered treatment than in the non-fil
tered and ambient air treatments towards the end of the experiment, in
dicating that filtering of the air delayed senescence. The decline of
the shoot area after the onset of plant senescence proceeded faster in
both chamber treatments. The faster development in the chamber was ex
plained by the faster accumulation of thermal time in the chamber.