Theme 4-2: Wildlife, Tourism and Multi-Facets of Rangelands/Grasslands--Poster Sessions

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Vegetation type can affect soil microbiology in agroforestry systems. Plants release different organic exudates in the rhizosphere, affecting microbial growth. This study evaluated the effect of forage cactus intercropped with different tree legumes on soil microbial biomass. The research was performed in a tropical semiarid Regosol at Caruaru Experimental Station, Agronomic Institute of Pernambuco, Northeast Brazil. Treatments included: i) Gliricidia sepium (Jacq.) Steud and forage cactus IPA-Sertânia (Nopalea cochenillifera Salm Dyck); and ii) Leucaena leucocephala [Lam.] de Wit.) and forage cactus IPA-Sertânia. Treatments were allocated in a randomized complete block design in a split-split-plot scheme, with four replications. Main plots consisted of agroforestry system, split-plot was the distance from tree rows, and split-split-plot soil depths. Organic fertilization with cattle manure was applied aiming a rate of 200 kg N ha-1. Tree legumes were planted in double rows spaced 9 x 1 x 0.5 m and cactus planted between double rows spaced by 1 x 0.25 m. Plot size measured 960 m2. Soil collection occurred in the rainy period (April 2019). Samples were collected at depths of 0-10 cm and 10-20 cm at 0, 1.5, 3.0, and 4.5 m away from legume rows. Response variables included soil basal respiration (SBR), microbial biomass C (C-mic), and metabolic quotient (qCO2). Data were subjected to analysis of variance using SAS. Means were compared by Tukey test at 5% significance. No significant difference was observed for SBR, MBC, and qCO2, with average values of 9.36, 202.98, and 0.05, and standard error 1.16, 10.90 and 0.01, respectively, in the different distances away from tree legumes. Introduction of arboreal legumes did not cause changes in microbial biomass. Microbial activity was similar in soils under forage cactus intercropped with Leucaena or Gliricidia.

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Evaluation of Microbial Biomass in Agroforestry Systems Using Forage Cactus and Leucaena leucocephala and Gliricidia sepium

Vegetation type can affect soil microbiology in agroforestry systems. Plants release different organic exudates in the rhizosphere, affecting microbial growth. This study evaluated the effect of forage cactus intercropped with different tree legumes on soil microbial biomass. The research was performed in a tropical semiarid Regosol at Caruaru Experimental Station, Agronomic Institute of Pernambuco, Northeast Brazil. Treatments included: i) Gliricidia sepium (Jacq.) Steud and forage cactus IPA-Sertânia (Nopalea cochenillifera Salm Dyck); and ii) Leucaena leucocephala [Lam.] de Wit.) and forage cactus IPA-Sertânia. Treatments were allocated in a randomized complete block design in a split-split-plot scheme, with four replications. Main plots consisted of agroforestry system, split-plot was the distance from tree rows, and split-split-plot soil depths. Organic fertilization with cattle manure was applied aiming a rate of 200 kg N ha-1. Tree legumes were planted in double rows spaced 9 x 1 x 0.5 m and cactus planted between double rows spaced by 1 x 0.25 m. Plot size measured 960 m2. Soil collection occurred in the rainy period (April 2019). Samples were collected at depths of 0-10 cm and 10-20 cm at 0, 1.5, 3.0, and 4.5 m away from legume rows. Response variables included soil basal respiration (SBR), microbial biomass C (C-mic), and metabolic quotient (qCO2). Data were subjected to analysis of variance using SAS. Means were compared by Tukey test at 5% significance. No significant difference was observed for SBR, MBC, and qCO2, with average values of 9.36, 202.98, and 0.05, and standard error 1.16, 10.90 and 0.01, respectively, in the different distances away from tree legumes. Introduction of arboreal legumes did not cause changes in microbial biomass. Microbial activity was similar in soils under forage cactus intercropped with Leucaena or Gliricidia.