Evaluation of marandu palisadegrass regrowth intervals in silvopastoral and monoculture systems

Regina Pereira Lages, Antônio Clementino dos Santos, Raphael Pavesi Araújo, Juliana Silva de Oliveira, Mirelle Magalhães Souza, N. Alencar
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Abstract

Silvopastoral systems (SPS) offer a sustainable alternative for animal production in tropical ecosystems. This study aimed to evaluate the effects of deferment days on herbage accumulation, plant-part composition, and canopy structural characteristics of Marandu palisadegrass (Urochloa brizantha Hochst. ex A. Rich.) in SPS with Eucalyptus urophylla and monoculture (MC). The experiment was conducted using a randomized block design, with each system individually allocated at the center of each plot in a 3 x 4 factorial arrangement, consisting of three systems: monoculture, and silvopastoral systems with tree row spacings of 12 m and 18 m, and tree intra-row spacing of 2 m, across four regrowth periods (60, 90, 120, and 150 days), each with three replications. Increasing deferment days reduced the proportion of green components in the forage, affecting tiller population density (TPD), leaf dry mass (LDM), and leaf/stem ratio. Maximum LDM production occurred at approximately 88 days with 0.63 Mg ha-1, while peak green dry mass (GDM) was at 94 days, reaching 1.11 Mg ha-1. Both dead material dry mass (DMDM) and total dry mass (TDM) increased linearly with regrowth periods, although TDM comprised about 47% dead forage. A regrowth period of 94 days from March is feasible for Marandu palisadegrass in SPS with 12 m and 18 m between tree rows, demonstrating that this spacing does not hinder forage production.
评估马兰都糙叶草在林牧系统和单一种植系统中的再生间隔时间
林牧系统(SPS)为热带生态系统的动物生产提供了一种可持续的替代方法。本研究旨在评估延迟天数对马兰杜棕榈草(Urochloa brizantha Hochst.试验采用随机区组设计,每个系统单独分配在每个小区的中心,呈 3 x 4 因式排列,包括三个系统:单一栽培和林牧系统,树行距分别为 12 米和 18 米,树内行距为 2 米,跨越四个再生期(60、90、120 和 150 天),每个再生期有三次重复。延迟天数的增加降低了牧草中绿色成分的比例,影响了分蘖群密度(TPD)、叶干重(LDM)和叶/茎比。最大叶干质量(LDM)产生于大约 88 天,为 0.63 兆克/公顷-1,而最大绿干质量(GDM)产生于 94 天,达到 1.11 兆克/公顷-1。死物干重(DMDM)和总干重(TDM)均随生长期的延长而线性增加,但总干重中约 47% 为死草。在树行之间间隔为 12 米和 18 米的 SPS 中,从 3 月份起 94 天的再生长期对马兰都糙叶草来说是可行的,这表明这种间距不会妨碍牧草生产。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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