Ecological evaluation of the nitrogen fertilizer application in the paddy fields
1999
Stoichev, D. | Stoicheva, D. | Angelov, G. | Dimitrova, K. | ( Poushkarov Institute for Soil Science and Agroecology, BG-1080 Sofia (Bulgaria))
The main criteries for the ecological evaluation in this research are: nitrogen balance in the paddy field, the content of nitrogen at the entrance and the exit of the system, the content of nitrogen in the soil solution and the nitrate migration through the soil profile. There are proven some variants of fertilization in which the level of the yields remains the same as in the practice and the nitrogen loses with the surface water are minimized. Under this conditions nitrogen content in the soil solution and nitrate accumulation and leaching through the soil profile is the nearly the same as in the non-fertilized plots.
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