Influence of nitrogen fertilization on soil available nutrients and yield of crops
1990
Ciecko, Z. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Zaklad Przyrodniczych Podstaw i Skutkow Nawozenia)
Field experiments were conducted on good wheat, good rye and very weak rye soil complex to study the effect of increasing nitrogen rates on mineral N and available P, K and Mg of the soils as well as yield of farm crops. The following crops were grown: potatoes, spring barley, rye as catchcrop + leguminous mixture as second crop. Nitrogen was applied for potatoes, spring barley and rye (catchcrop) at the following rates: 0, 40, 80, 120, 160, 200 and 240 kg/ha. The soil analysis performed in the third year of the experiment showed a highly positive correlation between increasing nitrogen rates and the content of mineral N in the soil of all complexes studied. There was a tendency for high nitrogen rates to decrease the content of available soil P, K and Mg. Increasing nitrogen rates significantly increased
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