Abstract:
:A three-year-long field experiment was conducted in a continuous grazing system with a variable stocking rate to evaluate effects of increasing nitrogen levels in Marandu grass (Brachiaria brizantha Hochst ex A. Rich Stapf "marandu") on herbage mass, forage accumulation rate (FAR), forage quality, stocking rate (SR), average daily gain (ADG), gain per hectare (GPH), and gain per kg of applied N. The experimental design was completely randomized with four treatments (control without application of N, and 90, 180, and 270 kg N ha-1 year-1) and three replicates (paddocks per treatment); nitrogen was applied in the form of urea. Herbage mass, crude protein (CP), FAR, SR, GPH, and the nitrogen nutrition index increased with increasing nitrogen level (P < 0.05), whereas the neutral detergent fibre (NDF), acid detergent fibre, and nitrogen usage efficiency decreased with increasing nitrogen level (P < 0.01). Crude protein was higher than 12% and NDF lower than 60% in all treatments. Nitrogen application rate affected ADG (P < 0.05) but did not fit any equation. The highest ADG was 90 kg N ha-1 year-1 (985 g animal-1 day-1). Increasing the nitrogen level is a promising way to improve Marandu grass production, nutritive value, and animal production.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Delevatti LM,Cardoso AS,Barbero RP,Leite RG,Romanzini EP,Ruggieri AC,Reis RAdoi
10.1038/s41598-019-44138-xsubject
Has Abstractpub_date
2019-05-20 00:00:00pages
7596issue
1issn
2045-2322pii
10.1038/s41598-019-44138-xjournal_volume
9pub_type
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