Effects of Cultivar, Nitrogen Rate and Harvest Time on the Content of Carbohydrates and Protein in the Biomass of Perennial Ryegrass

The aim of this study was to determine the effects cultivar, nitrogen (N) rate and harvest time on content water-soluble carbohydrates (WSC), crude protein (CP) WSC:CP ratio in aboveground biomass perennial ryegrass (Lolium perenne L.). A small-area field experiment conducted Agricultural Experiment Station Tomaszkowo (53°42′40.8″ N 20°26′04.7″ E, north-eastern Poland). Data were presented for three years full utilization (2013–2015). experimental factors as follows: (i) cultivar: Bajka Baronka, (ii) (kg ha−1): 0, 120, 240, (iii) time: 8.00–10.00 a.m., 12.00–2.00 p.m., 4.00–6.00 p.m. tetraploid cultivar Baronka had higher WSC lower CP a dry matter (DM) basis than diploid (by approx. 3% average). An increase fertilizer 240 kg ha−1 contributed decrease concentrations by 23% cv. 19% an 32% 23%, respectively. Both cultivars accumulated significantly amounts when harvested at noon afternoon morning. also affected time, it harvesting carried out analyzed within optimal range ruminants, (1:1.11). Nitrogen applied negative influence ratio, decreasing its value around 36% (relative 120 ha−1) 35% unfertilized treatment). In both cultivars, morning characterized lowest ratio.