Ecological aspects of the high intensity of fertilization of perennial grass stands by nitrogen

Masaryk, S.

Ekologia-CSSR 1(2): 143-156


Accession: 005209776

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Experiments were performed under different soil-ecological conditions during the fertilization of perennial grass stands (TTP) at doses 0-(1)-120, (II)-240, (III)-480 kg N/ha. At the dose III-N the soil pH decreased on the average by 0.47 pH/KCl, the botanical composition (degradation) of perennial grass stands also changed, especially in higher positions. Changes of soil saturation (S,nH1) were correlated with the changes of pH/KCl. The content of NO3, NH4, Ca2, Mg and K ions in surface floated and leachate waters increased mainly with highest dose of N. The content of NO3-N in soils increased markedly at the dose III-N in dependence on rainfall and ecological conditions at the end of vegetation period, with a decrease in winter. With increasing doses of N, the coefficient of the utilization of N by the stand decreased in dependence on the territory and the height above sea level to 34%, in extreme conditions to 21%. NO3 content in hay sometimes exceeded 0.2% in dry matter.