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https://doi.org/10.5713/ab.21.0113    [Accepted] Published online June 23, 2021.
Effects of different nitrogen doses and cultivars on fermentation quality and nutritive value of Italian ryegrass (Lolium multiflorum Lam.) silages
Ibrahim Ertekin1,*  , Ibrahim Atis1  , Yusuf Ziya Aygun1  , Saban Yilmaz1  , Mustafa Kizilsimsek2 
1Department of Field Crops, Faculty of Agriculture, Hatay Mustafa Kemal University, Hatay, 31060, Turkey
2Deparment of Field Crops, Faculty of Agriculture, Kahramanmaras Sutcu Imam University, Kahramanmaraş, 46040, Turkey
Correspondence:  Ibrahim Ertekin, Tel: +905452590187, Fax: +903262455832, Email: ibrahimertekin@mku.edu.tr
Received: 12 March 2021   • Revised: 16 April 2021   • Accepted: 23 May 2021
Abstract
Objective
The fermentation profile and silage quality of 3 Italian ryegrass (Lolium multiflorum Lam.) cultivars (cvs. Devis, Hellen and Trinova) treated with 5 nitrogen doses (0, 50, 100, 150 and 200 kg ha-1) were evaluated.
Methods
The experiment was laid out in split plot in randomized complete block design with three replications. Annual ryegrass cultivars used in this study have been commonly grown in Turkey. Nitrogen doses were set in main plot and nitrogen doses in split plot in the field. Plants were harvested at full-flowering stage with DM content about 220 g kg-1 for first cutting and 260 g kg-1 for second cutting. Harvested plants were chopped theoretically into 2-3 cm lengths for ensiling. Chopped fresh materials were ensilaged by compressing in 2 L plastic jars about 3±0.1 kg.
Results
Effects of N doses on dry matter, neutral detergent fiber, acid detergent fiber, dry matter digestibility, relative feed value, crude protein, pH, ammonia nitrogen, lactic acid, acetic acid and lactic acid/acetic acid were statistically significant while water soluble carbohydrate, ash and organic matter were not statistically different. Ammonia nitrogen, crude protein, ash, organic matter, lactic acid, and lactic acid/acetic acid were affected by cultivars, but the other parameters were not. Increasing nitrogen applications positively affected the chemical composition of annual ryegrass silage. The significant increase in protein content was remarkable, however, silage fermentation properties were adversely affected by the increasing nitrogen dose.

Conclusion

150 kg ha-1 nitrogen dose can be recommended for annual ryegrass harvested at full blooming stage. Even though the silage fermentation properties of the used cultivars were similar, cv. Devis gave better results than the others in terms of silage pH and relative feed value.
Keywords: Annual Ryegrass; Nitrogen Fertilizer; Silage; Fermentation Quality; Nutritive Value


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