Does fertilization practices increase residual nitrate nitrogen in soil irrigated with treated wastewater? An experimental trial on maize

Does fertilization practices increase residual nitrate nitrogen in soil irrigated with treated wastewater? An experimental trial on maize



Mohamed Naceur Khelil, Seloua Rejeb, Jean Pierre Destain, Dimitri Xanthoulis



Treated wastewater has significantly improved DM yield compared to
ground water. The form of nitrogen provided by the water was determinant
in drawing yields. Irrigation with ground water (where nitrogen is as
nitrate) induces a faster migration of nitrogen at depth. In contrast,
using treated wastewater (where nitrogen is as ammonium), resulting in a
relative distribution of the remaining nitric smaller in the lower
profile and therefore higher in the surface, especially after the second
year (2010). In addition, the relative distribution of nitrates in the
soil surface is even more important in the presence of organic manure.
All happens as if a certain amount of ammonium provided by treated
wastewater is retained in the organic compounds of manure. Yields were
significantly lower in irrigation with treated wastewater in the second
year and especially when fertilization was given in additional. If the
soil can be used for storage of the nitrogen supplied by the treated
wastewater during the first year of irrigation (24 kg N-NO3/ha before
irrigation to 115 kg N-NO3/ha after irrigation), to the second year the
capacity drops (to 64 N-NO3/ha) and a significant increase in nitrate
leaching occurs. Therefore, unlike the contribution of manure that seems
enrich the topsoil nitrate nitrogen, at least during the first
campaign, mineral fertilization unreasoning causes faster migration of
nitrogen at depth. 



10.22161/ijeab/2.2.33



ijeab.com/upload_document/issue_files/33 IJEAB-MAR-2017-33-Does fertilization practices increase residual.pdf



http://ijeab.com/submit-paper/

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