Agricultural answers and chemical composition of Massai grass under different nitrogen doses and urea sources
| Autor: | Alex Junio dos Santos, Danilo Antonio Morenz, Aline Barros da Silva, Fábio Costa dos Santos, Pedro Henrique Ferreira da Silva, Carlos Augusto Brandão de Carvalho |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Adubação nitrogenada Estações do ano Randomized block design chemistry.chemical_element Tiller (botany) Forage Biology 01 natural sciences chemistry.chemical_compound Animal science Dry weight Ureia revestida lcsh:Agriculture (General) Panicum maximum 0402 animal and dairy science 04 agricultural and veterinary sciences biology.organism_classification 040201 dairy & animal science Nitrogen lcsh:S1-972 chemistry Coated urea Urea General Agricultural and Biological Sciences Panicum 010606 plant biology & botany |
| Zdroj: | Semina: Ciências Agrárias, Vol 39, Iss 3, Pp 1225-1238 (2018) |
| ISSN: | 1679-0359 |
| Popis: | Under the hypothesis that modifying nitrogen sources and doses could increase nitrogen fertilization efficiency and productivity and improve forage quality, this study aimed to evaluate the morphological composition, structural characteristics and chemical composition of Panicum maximum cv. Massai forage cultivated under different urea sources (common and coated with Policote®) and nitrogen doses (200, 400 and 600 kg ha-1 year-1) during the autumn, winter and spring of 2014 and the summer and autumn of 2015. The experiment was carried out in Seropédica, RJ, under a randomized complete block design in a factorial arrangement (3x2) + 1 with four replications. High nitrogen rates promoted higher percentages of leaf blade dry mass and lower percentages of dead material dry mass in the forage mass and provided higher tiller population density and forage accumulation rate of Massai grass during the studied seasons. The use of coated urea promoted higher levels of crude protein in the forage than did the use of common urea in all seasons. The intensification of nitrogen fertilization reduced the nitrogen use efficiency but benefitted the structural characteristics, forage accumulation and chemical composition of Massai grass forage. The use of coated urea promoted greater of nitrogen use efficiency during all seasons of the year. |
| Databáze: | OpenAIRE |
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