In contrast, almost the entire denitrified
nitrate in the Kinloch profile appears to have been native nitrate, despite its concentration having been low, similar to the Rangiatea profile.
The rest, he says, is lost to the environment: "Unless an equivalent amount is denitrified
back to molecular [N.
Small N-loads (185 kg N/ha) in the non-Pin Gin soils imply that [approximately equal to] 1315 kg/ha of the nitrate-N that leached below the root-zone during the last 50 years, under the minimum leaching scenario, either denitrified or entered lateral-flow and/or deep groundwater.
Low retention in non-Pin Gin soils indicates that most of the nitrate that leached below the root-zone probably entered water bodies and/or denitrified.
Between 25%, and 75% of the nitrogen regenerated in the sediments was estimated to have been denitrified
(Table I), indicating that denitrification is a significant sink for nitrogen in Parker River Estuary.
2]O flux on Day 1 was possibly due to the native inorganic-N, already in the soil, being denitrified
in response to the formation of transient anaerobic microsites upon the addition of the aqueous amendments.
2001) estimated that 40% of applied urea at the rate of 115 kg N/ha was lost from an ungrazed dairy pasture in tropical Queensland; about half was lost as ammonia volatilisation and the other half presumed to be denitrified
, although the proportion of [N.
1986) observed in irrigated maize that <3% of applied N fertiliser was denitrified
, although about 70% of this N was evolved as [N.
Given unlimited time, and assuming no further transformations occur, denitrified
N gases will eventually diffuse from areas of high concentration in the soil to low concentrations at the surface.
From the foregoing, we suggest that 30% of the nitrate that leached below cane-118 root-zone entered deep groundwater or lateral flow, and/or was denitrified
compared with 86% for cane-130, and 93% for banana.
15]N not denitrified
Nitrate recovered as a result of not Treatment (denitrified
) straw addition recovered After 4 days Control 9.
3]-N was probably denitrified
or immobilised because of the long residence time of N in the soil under reasonably high temperatures (Table 1).