Morphogenetic, structural and productive traits of buffel grass under different irrigation regimes

The water restriction conditions in the Brazilian semiarid region are one of the most limiting factors to the establishment and yield of forage grasses. This study aimed to evaluate the effect of different irrigation regimes on morphogenetic, structural and productive traits of buffel grass. Arandomized blocks design, with five treatments and six replications, was used. Treatments consisted of five irrigation regimes, corresponding to the intervals of 2, 4, 6, 8 and 10 days. The traits analyzed were: leaf emergence rate, phyllochron, leaf and stem elongation rate, leaf senescence rate, final leaf length, number of green leaves per tiller, number of tillers, stem height, leaf/stem ratio, leaf area index, dry mass of green leaf and stem, dry mass of green, dead and total forage, root dry mass, dry mass and green dry mass/dead dry mass ratio. The final leaf length and dead forage dry mass were not affected by the irrigation regimes. The leaf/stem ratio followed a quadratic model, maintaining the value of 0.51 up to the irrigation regime of four days. The other morphological, structural and productive traits decreased linearly with increasing irrigation frequencies. The irrigation intervals promoted reductions in the morphological, structural and productive parameters of buffel grass, when grown under greenhouse conditions. The irrigation regime of 2 days stands out as the least restrictive to the development of buffel grass

Crescimento e produção do capim massai sob déficit hídrico / Growth and production of grass massai under water deficit

Objetivou-se avaliar os efeitos de diferentes turnos de rega sobre as características de crescimento e produção do capim massai. A pesquisa foi realizada em casa de vegetação da Universidade Federal do Ceará-UFC, Campus do Pici, Fortaleza, CE. Utilizou-se delineamento em blocos casualizados, com cinco tratamentos constituídos dos intervalos de irrigação de 2, 4, 6, 8 e 10 dias, com quatro repetições. Foram avaliados: o número de folhas vivas por perfilho (NFV), taxa de alongamento de folhas (TAlF), taxa de alongamento de colmo (TAlH), taxa de aparecimento de folhas (TApF), taxa de senescência foliar (TSF), filocrono, altura, índice de área foliar (IAF), razão folha/colmo (F/C), número de perfilhos vivos (NPV), relação matéria viva/matéria morta (MV/MM), matéria seca (MS), produção de massa verde (PMVF) e seca (PMSF) de forragem e peso seco da raiz (PSR). Observou-se efeito linear (p<0,05) decrescente para o NFV, TAlF, TAlH e para a TApF. Notou-se que a partir do quarto dia sem irrigação o capim massai teve queda na produção de 10,68 g vaso-1 para 2,66 g vaso-1 para os tratamentos de 4 e 10 dias respectivamente, indicando que essa espécie tem sua produção comprometida em curto período de déficit hídrico. Intervalos de irrigação superiores há quatro dias influenciam as características de crescimento e produção do capim massai

Evaluation of the chemical composition of woody forage silages of the Brazilian semiarid

Avaliou-se a composição químico-bromatológica de silagens de forrageiras lenhosas em delineamento experimental inteiramente casualizado com seis tratamentos e quatro repetições. Os tratamentos foram compostos pelas espécies forrageiras: Prosopis juliflora, Mimosa tenuiflora, Mimosa caesalpiniifolia, Gliricidia sepium e Leucaena leucocephala. Verificou-se que as silagens de jurema preta, jucá e sabiá, apresentaram altos teores de MS, acima de 35%. A silagem de leucena apresentou maior teor de PB (22,40%) e maior pH (5,5), enquanto que a silagem de algaroba apresentou o menor teor de EE (2,83%). A silagem de gliricídia resultou em maior teor de N-NH3 (10,93%) e de NDT (66,94%) e menor teor (3,79%) de lignina. A silagem de sabiá apresentou maior teor de FDN (64,09%), enquanto seu teor de FDA (35,54%) foi semelhante à da silagem de jurema preta (35,76%). As silagens de algaroba e gliricídia apresentaram os maiores teores de CNF (28,32 e 26,86%, respectivamente) e menores teores de hemicelulose (13,39 e 12,65%, respectivamente). As silagens de leucena e gliricídia apresentaram menores teores de celulose com 14,77% e 15,53%, respectivamente. As silagens das forrageiras lenhosas estudadas nesse trabalho apresentam boa qualidade e podem ser fontes de alimento animal.The aim of this work was to evaluate the chemical composition of the woody forage silage in the completely randomized design with six treatments and four replications. The treatments consisted of forage species: Prosopis juliflora, Mimosa tenuiflora, Mimosa caesalpiniifolia, Gliricidia sepium and Leucaena leucocephala. It was found that the silages jurema preta, jucá and sabiá, showed higher levels of DM more than 35 %. Leucena silage presented a higher content of CP (22.40 %) and higher pH (5.5), while the algaroba silage presented lowest level of EE (2.83 %). Higher levels of N-NH3 (10.93 %) and TDN (66.94 %) and lowest content of lignin (3.79 %) were found for gliricidia silage. Sabia silage presented a higher content of NDF (64.09%), while its ADF valor (35.54%) was similar to jurema preta silage (35.76 %). Algaroba and gliricidia silages presented highest levels of NFC (28.32 and 26.86%, respectively) and lower hemicellulose (13.39 and 12.65%, respectively). Leucena and gliricidia silages showed lower levels of cellulose with 14.77 and 15.53%, respectively. The woody forage silages studied in this work shown a good quality and can be used as sources in animal feed

Evaluation of the chemical composition of woody forage silages of the Brazilian semiarid

The aim of this work was to evaluate the chemical composition of the woody forage silage in the completely randomized design with six treatments and four replications. The treatments consisted of forage species: Prosopis juliflora, Mimosa tenuiflora, Mimosa caesalpiniifolia, Gliricidia sepium and Leucaena leucocephala. It was found that the silages jurema preta, jucá and sabiá, showed higher levels of DM more than 35 %. Leucena silage presented a higher content of CP (22.40 %) and higher pH (5.5), while the algaroba silage presented lowest level of EE (2.83 %). Higher levels of N-NH3 (10.93 %) and TDN (66.94 %) and lowest content of lignin (3.79 %) were found for gliricidia silage. Sabia silage presented a higher content of NDF (64.09%), while its ADF valor (35.54%) was similar to jurema preta silage (35.76 %). Algaroba and gliricidia silages presented highest levels of NFC (28.32 and 26.86%, respectively) and lower hemicellulose (13.39 and 12.65%, respectively). Leucena and gliricidia silages showed lower levels of cellulose with 14.77 and 15.53%, respectively. The woody forage silages studied in this work shown a good quality and can be used as sources in animal feed