Banca de DEFESA: KARINA THAIS LIMA BURITY

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KARINA THAIS LIMA BURITY
DATE: 03/12/2021
TIME: 09:00
LOCAL: videoconferência
TITLE:

Soil quality indicators in different cultivation practices and tillage in Amazon

KEY WORDS:

Physical attributes. Soil management. Crop succession.

PAGES: 47
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Gênese, Morfologia e Classificação dos Solos
SUMMARY:

One of the main problems related to the loss of soil physical quality in consolidated no-tillage (DP) areas is related to subsurface soil densification. This process provides resistance to deep penetration of roots, limiting the search for water and nutrients and, in the long term, reducing productivity in these areas. Thus, our objective was to characterize the physical attributes of the soil and evaluate the influence of different integrated tillage and cropping systems on soybean grain yield in a no-tillage area in the South-Western Amazon region. The experiment was carried out in the Experimental Field of Embrapa Rondônia, in Porto Velho, implemented in the 2013/14 agricultural year without reapplication of soil preparations. The experimental design used for randomized blocks in strips with eight replications. The treatments consisted of monoculture: (Soybean / Fallow); Legume / Grass Succession: (Soybean / Corn / Fallow); Legume Succession / Grasses in Intercropping (Soybeans / Corn + U. brizantha cv. Marandu), which are combined with four soil preparation systems: Direct Tillage, Direct Tillage with Scarification, Direct Tillage with Plaster Application and Direct Tillage with Scarification and Plaster application. These treatments were arranged in vertical strips, where each block was composed of horizontal strips, corresponding to the three cultivation systems, and vertical strips, with the four tillage systems in the vertical. Aggregate stability (EA), weighted mean diameter (DMP), geometric (DMG), mechanical resistance to penetration (RP), soil density (Ds), macroporosity (Macro), microporosity (Micro), total porosity (PT) and determined the granulometric fractions of the soil and Total Organic Carbon of the soil (TOC). The hypothesis of normality of the data was tested by the Shapiro-Wilk test, and in the absence of normality, transformed by Box Cox and evaluation by analysis of variation (ANOVA), when significance was found, through the F test, as means were compared by the Test Tukey. The best soil aggregation indices occurred in areas with grass cover and intercropping and associated with soil scarification. The effects on Ds and RP were not observed, as treatment methods were below the defined limits. Crop systems demonstrate only consistent effects on improving macroporosity with positive interaction as combinations of soil preparation treatments on physical attributes. The values of soil granulometry, demonstrate correlation with Ds and with the other parameters showed the importance of this attribute as an indicator of soil quality. The influences of treatments on the yield performance of soybean crop were not identified.

BANKING MEMBERS:
Externo à Instituição - JOSE ELOIR DENARDIN - EMBRAPA
Presidente - 387335 - LUCIA HELENA CUNHA DOS ANJOS
Interno - 1060711 - MARCOS GERVASIO PEREIRA