Measured and simulated nitrate leaching on an organic and a conventional mixed farm

被引:13
作者
De Neve, S [1 ]
Dieltjens, I [1 ]
Moreels, E [1 ]
Hofman, G [1 ]
机构
[1] State Univ Ghent, Dept Soil Management & Soil Care, Div Soil Fertil & Soil Data Proc, B-9000 Ghent, Belgium
关键词
D O I
10.1080/01448765.2003.9755266
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
A number of fields on an organic (a potato field, a pasture and a field with red cabbage) and a conventional mixed farm (a potato field, a pasture and a field with cauliflower) were compared with respect to nitrate leaching in winter, using both soil mineral N measurements and a simulation approach. Soil organic matter N mineralization rates of the surface layers were determined during laboratory incubations. Mineral N contents of the 0-90 cm layer of each field were monitored during the period October-March. A coupled N mineralization-leaching model was used to simulate NO3- leaching over this period. Calculated NO3- leaching was in the same range on most fields, between 66 and 87 kg NO3--N ha(-1), except for the conventional pasture, which had smaller losses (35 kg NO3--N ha(-1)), and the conventional cauliflower, which had very large losses (293 kg NO3--N ha(-1)). The contribution of N mineralization during autumn and winter to NO3- leaching was important, and could only be taken into account explicitly using simulation models. The most remarkable difference with respect to N leaching was observed between the conventional cauliflower and organic red cabbage field, both with very high N fertilization rates. This was attributed to the differences in type of fertilizer applied, with N fertilization on the conventional fields much more conducive to N losses. The average NH4+-N concentrations during the field experiment were larger on the organic fields than on the conventional fields. This indication for a retardation or inhibition of nitrification in the organic fields is an important observation, which obviously could have important implications for NO3- leaching, but needs to be further investigated and quantified before it could be incorporated into simulation models.
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页码:217 / 229
页数:13
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