NDLI: Desnitrificacion En Un Suelo Bajo Siembra Directa En Funcion De La Presencia De Plantas De Maiz Y De La Dosis De Nitrogeno

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Desnitrificacion En Un Suelo Bajo Siembra Directa En Funcion De La Presencia De Plantas De Maiz Y De La Dosis De Nitrogeno

Content Provider	Semantic Scholar
Author	Rozas, Hernán Sainz Echeverría, Hernán Eduardo Barbieri, Pablo Andrés
Copyright Year	2004
Abstract	In the Southeastern of Buenos Aires Province little information exists on denitrification losses from soils under no-tillage with and without maize plants and variable soil nitrogen availability. A field experiment was carried out in 1997/98 growing season at Balcarce, Argentina (37° 45' S, 58° 18´ W), on a soil complex of a fine, mixed, thermic Typic Argiudoll and a fine, illitic, thermic Petrocalcic Paleudoll. The treatments were a factorial combination of N rates (0 and 210 kg ha -1 ) and presence or absence of maize plants. Denitrification rates were evaluated during a period of 92 days. Denitrification rate was significantly lower with presence than in absence of maize plants. For the highest nitrogen rate, maize plants decreased denitrification rate even during the periods of highest soil moisture (393 and 307 g N ha -1 d -1 without and with plants, respectively). Maize plants limited denitrification rate by decreasing water filled pore space (WFPS) and nitrate concentration. A high relationship was found between denitrification rate and soil water availability and nitrate concentration (y= -0.616 + 0.005 x NO 3 -N + 0.0311 x WFPS; r 2 = 0.58). Cumulative N 2 O-N losses were 11.4 and 16.1 kg N ha -1 for 0 and 210 kg N ha -1 , respectively, in the treatments without plants, and 4.1 and 6.5 kg N ha -1 for 0 and 210 kg N ha -1 , respectively, for treatments with plants. Results of this experiment show that denitrification losses can be high in soils under no-tillage during the fallow conditions.
Starting Page	27
Ending Page	35
Page Count	9
File Format	PDF HTM / HTML
Volume Number	22
Alternate Webpage(s)	http://www.suelos.org.ar/publicaciones/vol_22n1/saint_rozas_27-35.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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