Banca de DEFESA: MARIA TELMA DE AQUINO RODRIGUES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA TELMA DE AQUINO RODRIGUES
DATE: 21/02/2025
TIME: 09:00
LOCAL: Online e presencial
TITLE:

Impact of the distance from Sabiá trees (Mimosa caesalpiniifolia Benth.) on Urochloa decumbens (Stapf) R.D. Webster in a silvopastoral system

KEY WORDS:

Shading, sustainability, forage mass, tiller population density

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

The use of silvopastoral systems (SPS) can bring various ecosystem benefits and contribute to Brazil achieving sustainable development goals and reducing greenhouse gas emissions from livestock activities, which contribute to climate change. The objective of this study was to evaluate and explain the impact of the distance from Sabiá trees (Mimosa caesalpiniifolia Benth.) in SPS on soil moisture, total nitrogen, forage mass, and morphological and structural characteristics of Urochloa decumbens (Stapf) R.D. Webster in SPS after seven years of establishing the tree component. The experiment was conducted at the Prof. Antônio de Pádua Maranhão Fernandes Experimental Farm of the Federal Rural University of Pernambuco (UFRPE), in the municipality of Garanhuns, PE. The treatments were distributed in a randomized block design with three replicates and consisted of: (i) Urochloa decumbens in monoculture and (ii) SPS formed by U. decumbens (Stapf) R.D. Webster + Sabiá. Samples of Urochloa decumbens were collected at five different distances (2.5, 5, 7.5, 10, 12.5 m) from the native leguminous Sabiá tree in SPS every 21 days over one year (2023-2024). The following variables were evaluated: canopy height, tiller population density, average tiller weight, forage density, forage mass, apical meristem height, leaf:stem ratio, proportion of leaf, stem, and senescent material, soil moisture, SPAD index, and nitrogen concentration. Data were analyzed using SAS OnDemand for Academics. The design used was a randomized block with split plots, where the periods (dry and rainy) were considered as main plots, and the treatments were allocated in the subplots. The means of the periods were compared using the Tukey test. Specific comparisons between each distance and the control (monoculture) were performed using multiple controls with simulated adjustment. Polynomial contrasts (linear, quadratic, and cubic) were used to characterize the effect of tree distances on U. decumbens. The significance level adopted was 5%. Forage mass was higher in SPS at a distance of 7.5 m from the tree line compared to monoculture (4,213 kg ha⁻¹ vs. 3,819 kg ha⁻¹, respectively), and forage density was higher in SPS at a distance of 12.5 m compared to monoculture. The proportion of senescent material in SPS was lower at distances of 2.5 and 5 m compared to monoculture, while the nitrogen content of U. decumbens was higher in SPS at distances of 2.5 and 5 m compared to monoculture. Distances less than 5.0 m affected the density and forage mass of U. decumbens in SPS. M. caesalpiniifolia contributed to an increase in total nitrogen in the forage up to 5.0 m from the tree rows. It is important to implement management strategies, including fertilization starting at 7.5 m from the trees, to ensure the persistence of U. decumbens.

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COMMITTEE MEMBERS:
Presidente - VALDSON JOSE DA SILVA
Interno - ALEXANDRE CARNEIRO LEAO DE MELLO
Externa à Instituição - LILIANE SEVERINO DA SILVA