Production of nutrients in dual-purpose wheat pastures managed with different doses of nitrogen as topdressing – exponential model
Document title: Production of nutrients in dual-purpose wheat pastures managed with different doses of nitrogen as topdressing – exponential model
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000435918
ISSN: 0001-3765
Authors: 1
2
3
4
5
1
6
2
Institutions: 1Universidade Federal de Santa Maria, Programa de Pos-graduacao em Agronegocios, Palmeira das Missoes, Rio Grande do Sul. Brasil
2Universidade Federal de Santa Maria, Departamento de Zootecnia e Ciencias Biologicas, Palmeira das Missoes, Rio Grande do Sul. Brasil
3Instituto Federal de Educacao, Ciencia e Tecnologia Sul-Rio-Grandense, Ciencia e Tecnologia Sul-Rio-Grandense, Pelotas, Rio Grande do Sul. Brasil
4Centro Universitario Leonardo da Vinci, Nucleo de Educacao a Distancia, Indaial, Santa Catarina. Brasil
5Universidade de Sao Paulo, Departamento de Zootecnia, Piracicaba, Sao Paulo. Brasil
6Universidade Federal de Santa Maria, Curso de Zootecnia, Palmeira das Missoes, Rio Grande do Sul. Brasil
Year:
Volumen: 92
Number: 3
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Aplicado, descriptivo
English abstract The aims of this study were to evaluate the yield and composition of dual-purpose wheat pasture BRS Tarumã managed with various urea nitrogen (N) doses and validate an exponential model and compare nutrient production costs. The completely randomized design had four replications per treatment (0, 150, 250, 350, and 450 kg N ha-1). For the 350 and 450 kg ha-1 treatments, the cycle was 212 d whereas that of the control was 167 d. The control accumulated 1,771 kg ha-1 dry matter. In contrast, the 450 kg ha-1 treatment accumulated 7,011 kg ha-1 DM. Topdressing nitrogen (150, 250, 350, and 450 kg ha-1) increased the traditional average daily accumulation rate by 586% relative to the control. However, the degree-days method determined a daily accumulation rate 652% higher than the control. The levels of dry matter and other nutrients in BRS Tarumã wheat pasture were influenced by the doses of nitrogen in the topdressing under the same environmental conditions (temperature and rainfall). An exponential model explained the dynamics of nutrient accumulation and was based on the thermal sum of each nitrogen dose impacting the cost per kilogram of pasture produced
Disciplines: Agrociencias
Keyword: Gramíneas,
Fertilización,
Nutrientes minerales,
Urea,
Composición química,
Suma térmica,
Rendimiento,
Triticum aestivum
Keyword: Gramineae,
Fertilization,
Mineral nutrients,
Urea,
Chemical composition,
Thermal sum,
Yield,
Triticum aestivum
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