The effect of prolonged mineral fertilization of a mountain meadow on some chemical properties of the soil
Mazur, K.; Mazur, T.; Mazgaj, M.
Acta Agraria et Silvestria Series Agraria 20: 189-202
On a natural mountain meadow (altitude 700 m) investigations were made in a 12-yr experiment on the effect of differentiated mineral fertilization on the dynamics of changes of some soil properties. The first 6-yr period of the experiment was separated from the 2nd one by an interval of 2 yr without fertilizers. The experiment was made on a light loam acid brown soil. The annual mean amount of precipitation in the region is about 900 mm and the mean temperature about + 6.degree. C. Fertilization affected actual acidity and pH to a lesser degree, while it considerably differentiated the soil potential acidity. The greatest increase of the latter was caused by 1-sided fertilization with ammonium nitrate or NPK fertilization with a double dose of N (180 kg N/ha). The application of superphosphate instead of calcined phosphate in the 2nd part of the experiment (since 1976) caused a further increase of soil acidity. As an effect of a positive balance of P the available form of this nutrient increased in the soil, more distinctly in the objects with ammonium nitrate than in those with urea. The balance of K was equilibrated only in the object PK. In the other fetrilizer combinations there occurred a decrease of K content in the soil, although smaller than the difference in the balance of this nutrient. Fertilization differentiated the values of equivalent ratios Ca : Mg and Mg : K in the soil. In the period with no fertilization potential acidity decreased and the contents of available P and K in the soil decreased.