Vp. Aneja et al., MEASUREMENTS OF NITRIC-OXIDE FLUX FROM AN UPPER COASTAL-PLAIN, NORTH-CAROLINA AGRICULTURAL SOIL, Atmospheric environment, 29(21), 1995, pp. 3037-3042
Agricultural soil NO flux measurements (using a dynamic chamber techni
que) were made from 18 August to 1 September 1993 in the Upper Coastal
Plain region of North Carolina in an effort to determine the role of
natural emissions of NO on rural atmospheric photochemistry. Overall a
verage NO flux rates increased proportionally to the level of applied
fertilizer nitrogen in the agricultural soil. The soybean, cotton, and
corn field measurements revealed an average NO flux of 1.79 (range -
1.0-6.9) ng N m(-2) s(-1); 3.77 (range - 0.1-38.0) ng N m(-2) s(-1); a
nd 8.05 (range - 0.5-52.8) ng N m(-2) s(-1) respectively. There was a
positive correlation between NO concentration near the soil surface (s
imilar to 50 cm) and NO flux. A significant negative correlation betwe
en NO flux and ambient O-3 concentration, however, supports the hypoth
esis that soil emissions of NO contribute to local production of O-3 i
n rural areas.