Atividade biológica em um latossolo sob pastagem de Brachiaria brizantha adubada com cinza vegetal
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Data
2021-08-26
Autores
Reis, Christian Matheus Alves
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Universidade Federal de Mato Grosso
Resumo
In the state of Mato Grosso, agriculture is the main economic activity,
as it contributes strongly to the development of the region. The agricultural sector
continues to expand and the use of new technologies to promote a balance
between production and soil quality becomes increasingly necessary. Thus, the
objective was to evaluate the biological and enzymatic activity in a soil under a
pasture area in the process of implantation and fertilized with wood ash. The
experiment was installed in the experimental field of the Federal University of
Rondonópolis, Rondonópolis-MT, under pasture that was established in 2018,
with a randomized block design, 5x2 factorial scheme, consisting of 5 doses of
wood ash (0, 8, 16, 24 and 32 t ha-1
), two forms of application of wood ash
(incorporated and non-incorporated), arranged in strips, totaling 10 treatments,
with four replications. Soil samples, classified as Dystrophic Red Latosol, were
collected at a depth of 0-0,10 m and in two periods (dry and rainy), in the first
year of pasture implantation. Four soil samples referring to the native forest were
collected to use as a reference, as it is a preserved environment. The evaluation
of microbial activity and soil quality were measured using biological attributes
such as: carbon and nitrogen from microbial biomass, basal respiration,
metabolic quotient, diazotrophic bacteria and the enzyme acid phosphatase.
Data were subjected to statistical analysis using the R computer program, with F
test for analysis of variance, regression test for gray doses and Tukey test for
application management at 1%, 5% and 10% significance levels. The results
showed a significant interaction for the metabolic quotient in both periods,
showing better results with the doses of ash corresponding to 0 and 8 t ha-1 with
non-incorporated management, and diazotrophic bacteria, specifically the NFb
and JNFb mediums for the dry period, with the dose of 8 t ha-1 of ash incorporated
into the soil. The acid phosphatase showed better results for non-incorporated
management, with doses below 24 t ha-1 of ash. Biomass carbon and
diazotrophic bacteria present in the the JMV culture medium showed an isolated
effect for the doses of wood ash, while biomass nitrogen and basal respiration
showed an isolated effect for the applied management. The use of wood ash
showed a positive effect on soil quality, increasing soil microbial biomass and
acid phosphatase enzyme activity.
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REIS, Christian Matheus Alves. Atividade biológica em um latossolo sob pastagem de Brachiaria brizantha adubada com cinza vegetal. 2021. 94 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2021.