. 2006 Mar 13;103(12):4522–4527. doi: 10.1073/pnas.0600359103

Table 3.

Relative daily N loss rates and soil nitrate pools

Treatment and subplots	November 16, 2002				May 19, 2003
Treatment and subplots	Nitrate leaching	N₂O emissions	N₂ emissions	Soil nitrate	Nitrate leaching	N₂O emissions	N₂ emissions	Soil nitrate
Organic
Compost	0.021^a	0.024^b	0.148^b	2.18^a	0.118^a	0.096^b	0.906^c	2.18^a
Alfalfa	0.038^a	0.025^b	0.113^b	1.40^a	0.135^a	0.099^b	0.753^c	2.47^a
Control	0.026^a	0.006^a	0.048^a,b	1.06^a	0.075^a	0.014^a	0.077^a	1.82^a
Integrated
CaNO₃ + compost	0.048^a	0.024^b	0.088^a,b	6.67^b	0.593^b	0.079^b	0.577^b,c	3.18^a,b
Control	0.031^a	0.007^a,b	0.040^a	1.14^a	0.112^a	0.013^a	0.049^a	0.58^a
Conventional
CaNO₃	0.049^a	0.015^a,b	0.015^a	8.87^c	0.916^b	0.095^b	0.133^a,b	5.43^b
Control	0.024^a	0.002^a	0.030^a,b	1.20^a	0.064^a	0.004^a	0.049^a	1.30^a

All loss rates are expressed in ng of N per cm² per h. Soil nitrate is expressed as kg/ha N (for mean daily nitrate pools for 1 month after fall and spring fertilizations see Fig. 7, which is published as supporting information on the PNAS web site). Nitrate leaching rates are based on the assumption that the 1-cm² resin bag absorbed nitrate from a soil column not >10 cm² and not <1 cm², giving a range for nitrate leaching. The values shown are the average of minimum and maximum leaching rates. All data were log-transformed for analysis. Different superscript letters within rows represent significant differences at P < 0.05 (least significant difference).