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Nitrogen leaching from 15N labelled cow urine and dung applied to grassland on a sandy soil

Details zur Publikation
Wachendorf, C.; Wachendorf, M.; Taube, F.; Wachendorf, M.; Wachendorf, C.; Taube, F.
Nutrient Cycling in Agroecosystems

Zusammenfassung, Abstract
Nitrogen (N) leaching under grazed pastures can be very high directly under urine spots. The amount of Nwhich is returned by one excretion of urine or dung can locally exceed 1000 kg ha1 a1 which is far morethan the uptake by surrounding plants during one grazing period. We therefore quantified the contributionof N deriving from urine and dung to the total N leaching under urine and dung patches. Dung N and urineN was separately sampled from a cow feed with 15N labelled grassilage, and were amended on lysimeters inOctober 2000 and October 2001. Lysimeters (350 mm diameter and 800 mm length) were filled with sand,and an intact grass sod from a pasture, 4 lysimeter each were amended with the 15N labelled dung andurine; 4 lysimeters without an application of dung or urine served as control. During 11 months after dungand urine amendment the amount of leachate was monitored and leachate was analysed for nitrate,ammonium and total N. 15N in these fractions was measured. Dung and urine applications of 1052 and1030 kg N ha1 in autumn increased N leaching. Leaching loss of nitrate and dissolved organic N derivingfrom dung was only 37 kg N ha1 in both years, whereas under urine patches 447 kg nitrate-N ha1,108 kg N ha1 ammonia-N and 53 kg ha1 dissolved organic N leached on average of both experimentalyears. N not deriving from dung and urine exceeded the leached N under the control by about 36 and136 kg ha1 on average of both years, suggesting the contribution of different priming processes.

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Zuletzt aktualisiert 2019-25-07 um 14:53