*2.1. Site Description*

The primary sources of data are two series of field experiments with winter oilseed rape (*Brassica napus* L.), which were carried out during the 2015/2016 and 2016/2017 seasons in Baniewice (53◦05 N; 14◦36 E), Poland. The field experiment was conducted on soil with texture loamy sand in the top-soil over sandy loam, classified as Albic Luvisol (World Refernce Base -WRB, 2016) [38]. The content of the available nutrients was measured each year just after a fore-crop harvesting from three soil depths of 0.0–0.3, 0.3–0.6, and 0.3–0.9 m. The content of available nutrients was favorable for high-yielding WOSR (Table 1).

The local climate, classified as intermediate between atlantic and continental, is seasonally variable (Table 2). Precipitation during the period extending from January to July amounted to 332 mm in 2016 and to 622 mm in 2017 (237 in July). In June, a critical month with respect to pods and seed growth [39], the amount of rainfall was extremely low. Air temperatures were in both years higher in comparison to the long-term average.


**Table 1.** Soil characteristics of the experimental plots in the consecutive growing seasons 1, mg kg−<sup>1</sup> soil.

1 Mehlich 3 extraction solution [40]; 2 average ± standard deviation; 3 fertility class: VL—very low; L—low; M—medium; H—high; VH—very high [41].
