Reduced ozone by air filtration consistently improved grain yield in wheat

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Reduced ozone by air filtration consistently improved grain yield in wheat. / Pleijel, Håkan.

I: Environmental Pollution, Vol. 159, Nr. 4, 2011, s. 897-902.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Reduced ozone by air filtration consistently improved grain yield in wheat

AU - Pleijel, Håkan

PY - 2011

Y1 - 2011

N2 - This study considered effects of reduced [O-3] on wheat yield. Open-top chamber charcoal filtered air treatments were compared with non-filtered treatments for field-grown wheat. 30 experiments meeting requirements were found, representing nine countries in North America, Europe and Asia. 26 experiments reported improved yield and 4 experiments reduced yield by filtration, a significant positive effect. Average yield improvement was 9%. Average daytime [O-3] was reduced by filtration from 35 to 13 nmol mol(-1). Filtration efficiency was 63% for O-3 and 56% for SO2. For NOx it was observed that NO2 was reduced and NO increased by filtration. Thus, filters convert NO2 to NO. Most experiments reported low or very low [SO2] and [NOx]. Thus, O-3 can be concluded to be the main phytotoxic component in the experiments. Elevated [NO2] was observed in one experiment. The conclusion is that current [O-3] over large parts of the world adversely affect wheat yield. (C) 2010 Elsevier Ltd. All rights reserved.

AB - This study considered effects of reduced [O-3] on wheat yield. Open-top chamber charcoal filtered air treatments were compared with non-filtered treatments for field-grown wheat. 30 experiments meeting requirements were found, representing nine countries in North America, Europe and Asia. 26 experiments reported improved yield and 4 experiments reduced yield by filtration, a significant positive effect. Average yield improvement was 9%. Average daytime [O-3] was reduced by filtration from 35 to 13 nmol mol(-1). Filtration efficiency was 63% for O-3 and 56% for SO2. For NOx it was observed that NO2 was reduced and NO increased by filtration. Thus, filters convert NO2 to NO. Most experiments reported low or very low [SO2] and [NOx]. Thus, O-3 can be concluded to be the main phytotoxic component in the experiments. Elevated [NO2] was observed in one experiment. The conclusion is that current [O-3] over large parts of the world adversely affect wheat yield. (C) 2010 Elsevier Ltd. All rights reserved.

KW - Charcoal filter

KW - Grain mass

KW - Nitrogen dioxide

KW - Nitric oxide

KW - Ozone

KW - Sulphur dioxide

KW - Wheat

KW - Yield

U2 - 10.1016/j.envpol.2010.12.020

DO - 10.1016/j.envpol.2010.12.020

M3 - Article

VL - 159

SP - 897

EP - 902

JO - Environmental Pollution

T2 - Environmental Pollution

JF - Environmental Pollution

SN - 0269-7491

IS - 4

ER -