Olatuyi, S. O., Akinremi, O. O. and Hao, X. 2012. Solute transport in a hummocky landscape: II. Vertical and seasonal redistribution of bromide and15N-labelled nitrate. Can. J. Soil Sci. 92: 631-643. Bromide (Br-) tracer is often used to estimate potential nitrate-nitrogen (NO3-N) leaching in soil. An alternative is to use 15N-labelled fertilizer to provide a direct measure of NO3-N leaching losses. We employed a dual application of Br- and 15N to estimate NO3-N leaching in a hummocky landscape. The study was carried out near Brandon, Manitoba, in 2007 and 2008, using two separate plots (Site-2007 and Site-2008). The plots were delineated into three landscape positions as upper (UPP), middle (MID) and lower (LOW) slope. A microplot at each landscape received KBr at the rate of 200 kg Br- ha-1, and 15N-labelled KNO3 fertilizer at the rates of 0, 90 and 135 kg N ha-1. Site-2007 and Site-2008 were seeded to canola and winter wheat, respectively. Soil samples were taken in the fall and spring. The soil samples for the 90 and 135 kg N ha-1 fertilization treatments were analyzed for vertical distribution of Br-, 15N, and NO3-N. The smallest amounts of Br-, nitrogen derived from 15N-labelled fertilizer (NDFF), and NO3-N were measured in the soil profile (0 to 120 cm) at the LOW slope position for both N fertilizer rates. The greatest amounts were at the MID slope, indicating that the downward movement of solute followed the order of: LOW>UPP>MID (P<0.05). Crop uptake of fertilizer N was 35 and 63% in canola and winter wheat, respectively, while Br- uptake was negligible. In the absence of crop uptake, Br- transport was similar to that of NDFF as 38% of each solute was lost between fall and spring in Site-2007 and 33% in Site-2008. Unlike Br- and NDFF, NO3-N distribution remained unchanged between fall and spring measurements, possibly due to its replenishment from native soil N sources. The dual tracer technique, as used in this study, showed the limitations of using soil profile NO3-N alone as an indicator of nitrate leaching and for making treatment comparisons.
How to translate text using browser tools
1 May 2012
Solute transport in a hummocky landscape: II. Vertical and seasonal redistribution of bromide and 15N-labelled nitrate
S. O. Olatuyi,
O. O. Akinremi,
X. Hao
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
![](/ContentImages/journals/cjss/92/4/4/WebImages/117.092.0400.cover.jpg)
Canadian Journal of Soil Science
Vol. 92 • No. 4
May 2012
Vol. 92 • No. 4
May 2012
automne
Bbromure
Bromide
déplacement des soluté s
engrais
fall
fertilizer