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Authors
Advisor(s)
Abstract(s)
Foi realizado um ensaio experimental numa zona de altitude média da ilha de São
Miguel, com o objetivo de estudar a influência do intervalo de crescimento e do ano de
instalação da pastagem na produtividade e qualidade do azevém perene (Lolium
perenne L.). O ensaio decorreu em duas parcelas situadas a uma altitude média de 520
metros: a parcela A foi semeada em 2020 (P20) e a parcela B em 2021 (P21), ambas
com azevém perene. Os cortes foram realizados com dois intervalos de crescimento: 4
e 6 semanas (4s, 6s).
Ao longo do ensaio, observou-se que o desenvolvimento vegetativo (altura) e o arranque
inicial foram sempre superiores na parcela B (P21), em comparação com a parcela A
(P20). No corte 4sP21, a altura máxima atingida foi de 58,8 cm, enquanto no 4sP20 foi
de 57,4 cm. A mesma tendência verificou-se nos cortes de 6 semanas: 83,2 cm em
6sP21 e 79,8 cm em 6sP20.
Na parcela A, a produção total de matéria verde (MV) acumulada entre abril e junho foi
de 46 455 kg/ha com cortes a cada 4 semanas (4sP20) e de 48 988 kg/ha com cortes a
cada 6 semanas (6sP20). Na parcela B, os valores aumentaram significativamente, com
66 805 kg/ha em 4sP21 e 55 868 kg/ha em 6sP21.
Em termos nutricionais, os cortes 4sP20 e 4sP21 apresentaram menor teor de matéria
seca (19,0% e 17,4%, respetivamente) e maior teor proteico (10% e 11,5%). Já os cortes
6sP20 e 6sP21 evidenciaram maiores teores de matéria seca (26,9% e 26,3%), mas
menor teor de proteína (8,2% e 8,3%)
” Abstract An experimental trial was conducted in a mid-altitude area of São Miguel Island to study the influence of growth interval and year of pasture establishment on the yield and quality of perennial ryegrass (Lolium perenne L.). The trial took place in two plots located at an average altitude of 520 meters: Plot A was sown in 2020 (P20), and Plot B in 2021 (P21), both with perennial ryegrass. Harvests were carried out at two growth intervals: 4 and 6 weeks (4s, 6s). Throughout the trial, vegetative growth (height) and initial establishment were consistently greater in Plot B compared to Plot A. In the 4sP21 cut, the maximum height reached was 58.8 cm, while in 4sP20 it was 57.4 cm. A similar trend was observed in the 6-week cuts: 83.2 cm in 6sP21 and 79.8 cm in 6sP20. In Plot A, the total fresh matter (FM) yield accumulated between April and June was 46,455 kg/ha for the 4-week interval (4sP20) and 48,988 kg/ha for the 6-week interval (6sP20). In Plot B, the values increased significantly, reaching 66,805 kg/ha in 4sP21 and 55,868 kg/ha in 6sP21. In terms of nutritional content, the 4sP20 and 4sP21 cuts showed lower dry matter (DM) content (19.0% and 17.4%, respectively) and higher crude protein content (10% and 11.5%). In contrast, the 6sP20 and 6sP21 cuts had higher dry matter content (26.9% and 26.3%) but lower protein content (8.2% and 8.3%)
” Abstract An experimental trial was conducted in a mid-altitude area of São Miguel Island to study the influence of growth interval and year of pasture establishment on the yield and quality of perennial ryegrass (Lolium perenne L.). The trial took place in two plots located at an average altitude of 520 meters: Plot A was sown in 2020 (P20), and Plot B in 2021 (P21), both with perennial ryegrass. Harvests were carried out at two growth intervals: 4 and 6 weeks (4s, 6s). Throughout the trial, vegetative growth (height) and initial establishment were consistently greater in Plot B compared to Plot A. In the 4sP21 cut, the maximum height reached was 58.8 cm, while in 4sP20 it was 57.4 cm. A similar trend was observed in the 6-week cuts: 83.2 cm in 6sP21 and 79.8 cm in 6sP20. In Plot A, the total fresh matter (FM) yield accumulated between April and June was 46,455 kg/ha for the 4-week interval (4sP20) and 48,988 kg/ha for the 6-week interval (6sP20). In Plot B, the values increased significantly, reaching 66,805 kg/ha in 4sP21 and 55,868 kg/ha in 6sP21. In terms of nutritional content, the 4sP20 and 4sP21 cuts showed lower dry matter (DM) content (19.0% and 17.4%, respectively) and higher crude protein content (10% and 11.5%). In contrast, the 6sP20 and 6sP21 cuts had higher dry matter content (26.9% and 26.3%) but lower protein content (8.2% and 8.3%)
Description
Dissertação, Mestrado, Engenharia Agronómica, Instituto Politécnico de Santarém, Escola Superior Agrária, 2025
Keywords
Lolium perenne intervalo crescimento matéria verde pastagem establishment year perennial ryegrass growth interval green matter
Pedagogical Context
Citation
Araújo, F.B. (2025). Efeito do intervalo de crescimento e do tempo de instalação de pastagem, na produtividade e qualidade de azevém perene (Lolium perenne L.) na região Autónoma dos Açores. Dissertação de Mestrado na área da Engenharia Agronómica, apresentada na Escola Superior Agrária de Santarém.