LAUSR

Barley is one of the most important cereals growing in the Czech Republic. In this paper, we have evaluated how different fertilizer treatments (Control, N1—30 kg ha−1 N, N2—60 kg ha−1 N, NPK1—30, 60, 80 kg ha−1, respectively, NPK2—60, 60, 80, and NPK3—90, 60, 80) affected spring barley grain yield under different soil-climate conditions (Caslav-degraded Chernozem, Ivanovice-Chernozem, Lukavec-Cambisol) between the years 2013 and 2016. The agronomic efficiency (AE) and the effect of the fertilizer treatments (Control, N2, NPK2) on soil properties (pH, P, K, Ca, Mg, Cox, Nt) were also evaluated. The spring barley grain yield was significantly affected by the fertilizer treatment and soil-climate conditions. Two different models (quadratic and linear-plateau) provided the maximum and reasonable doses of N, according to the soil-climate conditions. Application of mineral P and K slightly increased the AE. The regular application of mineral P and K fertilizers led to an increase in the P and K concentration in the soil, which maintains soil fertility and prevents soil depletion.