**2. Materials and Methods**

*2.1. Site Description*

The long-term field trial was located on the western border of the city of Prague (the Czech Republic, Central Europe, temperate climate zone, 50◦0515 N, 14◦1728 E). The trial was established to study the effect of different fertilizer treatments and crop rotations on yield and quality of arable crops and soil chemical properties. The year the trial was established was 1954. The annual mean precipitation and mean temperature from the establishment of the trial is shown in Figure 1. The standard climatological long-term average (1954–2019) precipitation and temperature was 490.4 mm and 8.65 ◦C, respectively. The standard climatological normal (1961–1990) of the precipitation and temperature was 472.8 mm and 7.97 ◦C, respectively. The average annual precipitation for the years 2016, 2017, and 2018 was 382.1, 470.0, and 345.3 mm, respectively. The average annual temperature for the same years was 10.0, 9.9, and 11.1 ◦C, respectively. The average temperature at the site had an increasing trend, and total precipitation also increased slightly (Figure 1). According to Kožnarová and Klabzuba [30], all three years were characterized by different weather conditions. The year 2016 was very warm and very dry, with conditions relatively good for sugar beet. The year 2017 was warm with normal precipitation, providing optimal conditions for sugar beet. The year 2018 was extraordinary warm and very dry, significantly reducing beetroot and top yields. The altitude of the trial site is 370 m a.s.l. According to the World Reference Base [31], the soil type is haplic Luvisol.

**Figure 1.** The mean annual precipitation (mm) and temperature (◦C) at the experimental site in Prague (1954–2019). Blue and red squares indicate analysed years, blue is the linear regression equation for temperature and red is thelinear regression equation for precipitation.
