Changes of nitrogen regime of cinnamonic-podzolic soil in South Bulgaria as affected by long-term mineral and organic-mineral fertilization
1999
Ikonomova, E. | Koutev, V. | Balabanova-Georgieva, R. (N. Poushkarov Institute for Soil Science and Agroecology, BG-1080 Sofia (Bulgaria))
Research on changes of the main characteristics of nitrogen regime of a cinnamonic-podzolic soil has been carred out with incubation and field experiments. The soil samples were collected from treatments of a long-term field experiment with maize and wheat, grown in 27-year rotation: 1. Unfertilized, 2. PK, 3. NPK, 4. NPK+farmyard manure. The data obtained show the following changes in 0-30 cm soil layer: acidification of the soil in NPK-fertilized treatments; increase of total nitrogen from 0.06% to 0.09% and of organic matter content from 0.89% to 0.95% in NPK+farmyard manure treatment in comparison with unfertilized soil; C:N ratio decrease from 8.4 to 6.1.
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