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摘要
Estudaram-se caracter赤sticas morfog那nicas e estruturais de azev谷m (Lolium multiflorum Lam.) sob intensidades de pastejo. O delineamento experimental foi inteiramente casualizado, com quatro repeti es (transectas) e tr那s tratamentos constitu赤dos por intensidades de pastejo: ※Alta§, ※M谷dia§, ※Baixa§, correspondentes ao desaparecimento de 61,0; 43,3 e 21,1% do valor da massa de forragem inicial, respectivamente. O pastejo foi intermitente, com borregas, e o intervalo entre pastejos correspondeu 角 soma t谷rmica de 313 graus-dia. As intensidades de pastejo afetaram a morfog那nese e estrutura de azev谷m apenas no primeiro per赤odo de avalia o, quando o azev谷m na intensidade ※M谷dia§ apresentou as menores taxas de aparecimento e elonga o foliar e os maiores valores de dura o de vida das folhas. A altura do pseudocolmo, o comprimento de lamina intacta e desfolhada, o n迆mero de folhas intactas e em senesc那ncia foram superiores na intensidade ※Baixa§, sem diferir entre ※M谷dia§ e ※Alta§. A ado o das intensidades de pastejo de 43,3 e 61,0% do desaparecimento do valor da massa de forragem inicial possibilitaestender o est芍dio vegetativo do azev谷m anual. Para o manejo de azev谷m anual, recomenda-se o uso da intensidade de pastejo de 61,0%, que apresenta caracter赤sticas estruturais semelhantes 角s observadas na intensidade 43,3% e proporciona taxa de lota o 24,1% superior. Morphogenetic and structural characteristics of Italian ryegrass (Lolium multiflorum Lam) under grazing intensities were studied. The experimental design was completely randomized, with four repetitions (transects) and three treatments consisting of grazing intensities: ＆High＊, ＆Mean＊ and ＆Low＊, corresponding to the disappearance of 61.0, 43.3 and 21.1% the value of initial forage mass, respectively. Intermittent grazing was used, with ewe lambs, and the interval among grazing corresponded to thermal sum of 313 degree-days. Grazing intensities affected the morphogenesis and structure of Italian ryegrass only in the first evaluation period; when Italian ryegrass in the ＆Mean＊ intensity had the lowest leaf appearance rate and leafelongation rate and it had the highest values of leaf life span. Pseudostem height, length of the intact and defoliated blades, number of intact and senescent leaves were higher in ＆Low＊, and did not differ between ＆Mean＊ and ＆High＊. Adoption of grazing intensities equivalent to 43.3 and 61.0% of the disappearance of the initial forage mass allows extending the Italian ryegrass vegetative stage. For management of Italian ryegrass, the use of 61.0% grazing intensity is recommen
