*3.1. E*ff*ect of Nitrogen Fertilization on Morphological Features of Miscanthus* × *Giganteus*

Nitrogen fertilization had a significant influence on the number of leaves on the shoot (*p* = 0.0018) during the field experiment (Table 4). Both the number of shoots and the height of the plants increased significantly until the end of vegetation period (Figures 1 and 2). Without N fertilization, the shoots reached 3.34 m in height, whereas the height of plants after an application of 60 kg ha−<sup>1</sup> N was 3.31 m. The highest increases in height of shoots on unfertilized plots were found between June and July, while in fertilized plants they was found between July and August. The greatest increase in shoot diameter was found at the beginning of the vegetation period (Figure 3). A fast increase in the number of leaves on the shoot was observed in September. Between September and November, the differences were insignificant (Figure 4). The number of leaves on both fertilized and unfertilized shoots increased until November. After this period, it decreased.


**Table 4.** Morphological features of *Miscanthus* × *giganteus* (average for years 2014–2016).

**Figure 1.** The number of shoots during the vegetation period in the years 2014–2016 (average for years).

**Figure 2.** The height of plants during the vegetation period in the years 2014–2016 (average for years).

**Figure 3.** Diameter of shoots during the vegetation period in the years 2014–2016 (average for years).

**Figure 4.** Number of leaves on the shoots during the vegetation period in the years 2014–2016 (average for years).
