 ISSN 0235-7224 ISSN 2029-0586 (online) |
2008 m. Nr. 4 Nitrate variation in drainage water under degradation of peat soils
In 1997–2007, a research on the variation of nitrate concentration in peat soil drainage water and its dependence on annual precipitation, average air temperature, discharge and groundwater level were carried out. Tilling of mull fluvisol while cultivating cereals stimulated nitrate accumulation in the soil and leaching via drains. The average nitrate concentrations in meadow drainage water were 5.95 and in tillage land 16.94 mg · l–1, those of the leakage being 8.5 and 26.2 kg · ha–1, respectively. Nitrate concentration in the water of mineral soil, which had 5–7 times less organic materials compared with peat soil, was about 2.5 times lower. A stronger functional link was found between the content of nitrates in soil and water with drainage discharge and the groundwater level; a weaker link was observed with precipitation, air temperature and soil humidity. The highest tendency of nitrate increase was established in the drainage water from meadows in May: 15.2% from meadows and 8.9% from tillage land per year. The nitrate concentrations in drainage water increased less in October: 5.5% from meadows and 6.7% from tillage land per year. Keywords: nitrate nitrogen, concentration, peat soil, drainage, water |
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