Over the last 20 years, in many regions of Spain, there has been an intensification of pig production. Most of the resulting pig
slurry (PS) is applied to agricultural fields and so it is important to determine the availability of nitrogen for the crops and to
assess the risk of adverse environmental effects such as nitrate leaching. The effects of a single application of three different doses
of PS: 50, 100 and 150 m
3
ha
−
1
, were compared with a control mineral treatment in an irrigated Mediterranean environment.
Development and crop yield of corn and the amount of nitrate leached were evaluated during 3 years in a Typic Xerofluvent soil.
No significant differences for ab
oveground biomass, corn yield and nitrogen plant uptake were observed between the different
fertilization schemes. Nitrate concentrations in the soil solution at the 0.9–1.2 m depth were higher for the control treatment (44.7
mg NO
3
−
–N l
−
1
) than for the slurry treatments (ranging from 19.9 to 28.0 mg NO
3
−
–N l
−
1
), indicating a higher susceptibility
to nitrate leaching for the control mineral treatment. The high unaccounted losses in the N budget for the slurry treatments
and the unexpectedly decrease in the ratio between nitrate leaching and applied nitrogen with increased N doses proves that
there is a need to examine the slurry N cycle in the soils with especial emphasis in the immobilization of ammonium slurry in
Mediterranean conditions.
Over the last 20 years, in many regions of Spain, there has been an intensification of pig production. Most of the resulting pigslurry (PS) is applied to agricultural fields and so it is important to determine the availability of nitrogen for the crops and toassess the risk of adverse environmental effects such as nitrate leaching. The effects of a single application of three different dosesof PS: 50, 100 and 150 m3ha−1, were compared with a control mineral treatment in an irrigated Mediterranean environment.Development and crop yield of corn and the amount of nitrate leached were evaluated during 3 years in a Typic Xerofluvent soil.No significant differences for aboveground biomass, corn yield and nitrogen plant uptake were observed between the differentfertilization schemes. Nitrate concentrations in the soil solution at the 0.9–1.2 m depth were higher for the control treatment (44.7mg NO3−–N l−1) than for the slurry treatments (ranging from 19.9 to 28.0 mg NO3−–N l−1), indicating a higher susceptibilityto nitrate leaching for the control mineral treatment. The high unaccounted losses in the N budget for the slurry treatmentsand the unexpectedly decrease in the ratio between nitrate leaching and applied nitrogen with increased N doses proves thatthere is a need to examine the slurry N cycle in the soils with especial emphasis in the immobilization of ammonium slurry inMediterranean conditions.
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