Nutrient production in pastures of Triticale BRS Saturno submitted to different levels of nitrogen in topdressing / Produção de nutrientes em pastagens de Triticale BRS Saturno submetidas a diferentes doses de adubação nitrogenada em cobertura

Pastures are a primary source of feed for ruminants, which convert fibrous plants into nutritionally valuable foods for humans, such as meat and milk. However, it is important to understand the nutrient content of different fodder crops for ruminants and its effect on meat, milk, and milk products. We aimed to evaluate the effect of nitrogen fertilizer doses in topdressing on nutrient production in pastures of Triticale BRS Saturno. The experimental design was a randomized block with five replications. Descriptive statistics of yields per hectare were determined, and a simple linear regression was carried out at the level of 5% significance. The different nitrogen topdressing rates (0, 50, and 100 kg N ha-1) influenced the production (P < 0.05) of dry matter, total carbohydrates, neutral detergent fiber, acid detergent fiber, crude protein, soluble protein, insoluble protein in neutral and acid detergent, protein degradability, ether extract, linoleic and linolenic fatty acids, neutral detergent fiber digestibility after incubation for 24, 30, and 48 h, and the neutral detergent fiber degradation rate. The different doses of nitrogen fertilizer in topdressing in the form of urea increased nutrient production in pastures of Triticale BRS Saturno, mainly in relation to total carbohydrates and neutral and acid detergent fiber. To a lesser extent, it also significantly interfered with the production of nitrogenous constituents and fatty acids.(AU)

As pastagens são a principal fonte de alimentação dos ruminantes, que convertem as plantas fibrosas em alimentos nutricionalmente valiosos para os humanos, como carne e leite. No entanto, é importante compreender o teor de nutrientes de diferentes espécies forrageiras para ruminantes e seus efeitos na carne, leite e derivados lácteos. Objetivou-se avaliar os efeitos das doses de adubação nitrogenada em cobertura sobre a produção de nutrientes em pastagens de Triticale BRS Saturno. O delineamento experimental utilizado foi de blocos casualizados com cinco repetições. Os tratamentos aplicados foram doses de nitrogênio em cobertura (0, 50, e 100 kg N ha-1), utilizando ureia comum. Foram calculadas as produções por hectare de cada nutriente da pastagem. Foram determinadas as estatísticas descritivas das produções por hectare e realizado estudo por regressão linear simples ao nível de 5% de significância. As diferentes doses de nitrogênio em cobertura influenciaram as produções (P < 0,05) de: matéria seca, carboidratos totais, fibra em detergente neutro, fibra em detergente ácido, proteína bruta, proteína solúvel, proteína insolúvel em detergente neutro e ácido, a degradabilidade da proteína, extrato etéreo, ácidos graxos linoléico e linolênico, digestibilidade da fibra em detergente neutro com incubação por 24, 30, e 48h, e taxa de degradação da fibra em detergente neutro. As diferentes doses de adubação nitrogenada em cobertura na forma de ureia incrementam a produção de nutrientes em pastagens de Triticale BRS Saturno, principalmente sobre os carboidratos totais e a fibra em detergente neutro e ácido. Também interferem sobre a produção dos constituintes nitrogenados e ácidos graxos.(AU)

Nutrient production in pastures of Triticale BRS Saturno submitted to different levels of nitrogen in topdressing / Produção de nutrientes em pastagens de Triticale BRS Saturno submetidas a diferentes doses de adubação nitrogenada em cobertura

Pastures are a primary source of feed for ruminants, which convert fibrous plants into nutritionally valuable foods for humans, such as meat and milk. However, it is important to understand the nutrient content of different fodder crops for ruminants and its effect on meat, milk, and milk products. We aimed to evaluate the effect of nitrogen fertilizer doses in topdressing on nutrient production in pastures of Triticale BRS Saturno. The experimental design was a randomized block with five replications. Descriptive statistics of yields per hectare were determined, and a simple linear regression was carried out at the level of 5% significance. The different nitrogen topdressing rates (0, 50, and 100 kg N ha-1) influenced the production (P < 0.05) of dry matter, total carbohydrates, neutral detergent fiber, acid detergent fiber, crude protein, soluble protein, insoluble protein in neutral and acid detergent, protein degradability, ether extract, linoleic and linolenic fatty acids, neutral detergent fiber digestibility after incubation for 24, 30, and 48 h, and the neutral detergent fiber degradation rate. The different doses of nitrogen fertilizer in topdressing in the form of urea increased nutrient production in pastures of Triticale BRS Saturno, mainly in relation to total carbohydrates and neutral and acid detergent fiber. To a lesser extent, it also significantly interfered with the production of nitrogenous constituents and fatty acids.

As pastagens são a principal fonte de alimentação dos ruminantes, que convertem as plantas fibrosas em alimentos nutricionalmente valiosos para os humanos, como carne e leite. No entanto, é importante compreender o teor de nutrientes de diferentes espécies forrageiras para ruminantes e seus efeitos na carne, leite e derivados lácteos. Objetivou-se avaliar os efeitos das doses de adubação nitrogenada em cobertura sobre a produção de nutrientes em pastagens de Triticale BRS Saturno. O delineamento experimental utilizado foi de blocos casualizados com cinco repetições. Os tratamentos aplicados foram doses de nitrogênio em cobertura (0, 50, e 100 kg N ha-1), utilizando ureia comum. Foram calculadas as produções por hectare de cada nutriente da pastagem. Foram determinadas as estatísticas descritivas das produções por hectare e realizado estudo por regressão linear simples ao nível de 5% de significância. As diferentes doses de nitrogênio em cobertura influenciaram as produções (P < 0,05) de: matéria seca, carboidratos totais, fibra em detergente neutro, fibra em detergente ácido, proteína bruta, proteína solúvel, proteína insolúvel em detergente neutro e ácido, a degradabilidade da proteína, extrato etéreo, ácidos graxos linoléico e linolênico, digestibilidade da fibra em detergente neutro com incubação por 24, 30, e 48h, e taxa de degradação da fibra em detergente neutro. As diferentes doses de adubação nitrogenada em cobertura na forma de ureia incrementam a produção de nutrientes em pastagens de Triticale BRS Saturno, principalmente sobre os carboidratos totais e a fibra em detergente neutro e ácido. Também interferem sobre a produção dos constituintes nitrogenados e ácidos graxos.

Ryegrass (Lolium multiflorum) BRS Ponteio and wheat (Triticum aestivum) BRS Tarumã pasture with different doses of ammonium sulfate as topdressing

This study analyzed the behavior of the annual ryegrass (Lolium multiflorum) BRS Ponteio and dual-purpose wheat (Triticum aestivum) BRS Tarumã with different doses of ammonium sulfate as topdressing and evaluated the exponential growth model to explain the physiological development of both species. For each species, a completely randomized design was used with four replications per treatment with 9m2 area, in which the following treatments were distributed: 0, 150, 250, 350 and 450 kg nitrogen per hectare applied as ammonium sulfate. The cumulative and adjusted productions to the exponential growth model at the end of the cycle were, respectively: BRS Ponteio 150 = 5,620; 250 = 5,920; 350 = 7,585 and 450 = 8,491 and BRS Tarumã 150 = 3,922; 250 = 5,060; 350 = 7,024 and 450 = 7,491 kg dry matter per hectare. The cultivars analyzed without nitrogen application had limited growth and showed no adjustment even to the first order linear model. The application of nitrogen decreased the interval between cuts and increased dry matter production per hectare following the exponential growth model.

Ryegrass (Lolium multiflorum) BRS Ponteio and wheat (Triticum aestivum) BRS Tarumã pasture with different doses of ammonium sulfate as topdressing

This study analyzed the behavior of the annual ryegrass (Lolium multiflorum) BRS Ponteio and dual-purpose wheat (Triticum aestivum) BRS Tarumã with different doses of ammonium sulfate as topdressing and evaluated the exponential growth model to explain the physiological development of both species. For each species, a completely randomized design was used with four replications per treatment with 9m2 area, in which the following treatments were distributed: 0, 150, 250, 350 and 450 kg nitrogen per hectare applied as ammonium sulfate. The cumulative and adjusted productions to the exponential growth model at the end of the cycle were, respectively: BRS Ponteio 150 = 5,620; 250 = 5,920; 350 = 7,585 and 450 = 8,491 and BRS Tarumã 150 = 3,922; 250 = 5,060; 350 = 7,024 and 450 = 7,491 kg dry matter per hectare. The cultivars analyzed without nitrogen application had limited growth and showed no adjustment even to the first order linear model. The application of nitrogen decreased the interval between cuts and increased dry matter production per hectare following the exponential growth model.(AU)