Long-term experiments are very important in studying the changes of soil fertility and environmental conditions as well as in analyzing the stability and quality of crop production. Such experiments give us more information how to use the good agronomic practices and how to protect the nature. Probably the oldest still-running arable crop fertilizer experiment is the Broadbalk Experiment established by John B. Lawes in Rothamsted (UK) in 1843 (Goulding et al., 2000). Thanks to this experiment many other long-term fertilizer experiments were established worldwide (

No abstract

The genotype specificity in the uptake of the main nutrients according to the fertilization rate was investigated in Triticum aestivum L. varieties under conditions of a vegetation experiment. Four fertilization rates were tested: N 0 P 0 K 0 , N 200 P 200 K 200 , N 400 P 200 K 200 and N 600 P 200 K 200 . The response of the varieties to the nutrition conditions provided was studied during several stages of growth and development. The different nutrition regimes used lead to manifestation of the specific abilities of the varieties to take up nutrients. Genotype and mineral fertilization had a higher effect on nutrients uptake than stage of development. During the initial stage of wheat development, the differences established in the uptake of macro elements were greater between the varieties than between the individual fertilization rates. The differences were most evident at maturation. This specificity was well expressed in nitrogen and phosphorus uptake in total biomass and to a lesser extends -in potassium uptake. Varieties Slaveya and Milena had highest amounts of nitrogen uptake in grain.

No abstract