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The Cerrado ranks among the major biomes in Brazil and its vegetation can now be monitored through remote sensing, although environmental factors can affect the use of this technique. Thus, the possibility of conducting a study in a region with negligible anthropogenic intrusion may become a potential reference work in controlling the spatio-temporal alterations occurring in the Cerrado biome. This study aimed at assessing the spatio-temporal dynamics of the Brazilian Cerrado biome at different seasons of the year (wet and dry), employing various vegetation indices (NDVI, SAVI, EVI and LAI) drawn from the LANDSAT satellite images 8. The study itself was conducted in the Tadarimana Indigenous reserve situated in the State of Mato Grosso, Brazil. Extending across an area of 9952 hectares, the predominant vegetation cover in this reserve include the Savanna-Seasonal Contact (84.78%) and Savanna (15.22%). The data was analyzed using descriptive statistics and the best characterization of the vegetation was identified in the regions where higher variability was observed in the responses of the vegetation indices. The LAI revealed the best performance when the spatio-temporal dynamics of the Brazilian Cerrado biome was assessed. The wet season displayed the highest values among the different vegetation indices, despite the variances.

CRESCIMENTO DA AGRICULTURA IRRIGADA POR PIVÔ CENTRAL NA BACIA HIDROGRÁFICA DO ALTO RIO DAS MORTES - MT     JUAN VICENTE LIENDRO MONCADA1; JEFFERSON VIEIRA JOSÉ2; JÉFFERSON DE OLIVEIRA COSTA3; CARLOS ALBERTO QUILOANGO-CHIMARRO4; NICLENE PONCE RODRIGUES DE OLIVEIRA5 E TONNY JOSÉ DE ARAÚJO DA SILVA6   1 Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso (UFMT), Avenida dos Estudantes, 5055, Cidade Universitária, 78736-900, Rondonópolis, MT, Brasil. E-mail: liendroing@gmail.com. 2 Centro Multidisciplinar Campus Floresta, Universidade Federal do Acre (UFA), Estrada do Canela Fina, Km 12, Colônia São Francisco, 69980-000, Cruzeiro do Sul, AC, Brasil. E-mail: jfvieira@hotmail.com.br. 3 Departamento de Engenharia de Biossistemas, Universidade de São Paulo (USP/ESALQ), Avenida Pádua Dias, 235, Agronomia, 13418-900, Piracicaba, SP, Brasil. E-mail: costajo@alumni.usp.br. 4 Departamento de Engenharia de Biossistemas, Universidade de São Paulo (USP/ESALQ), Avenida Pádua Dias, 235, Agronomia, 13418-900, Piracicaba, SP, Brasil. E-mail: caquiloango@usp.br. 5 Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso (UFMT), Avenida dos Estudantes, 5055, Cidade Universitária, 78736-900, Rondonópolis, MT, Brasil. E-mail: niclene_ponce@hotmail.com. 6 Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso (UFMT), Avenida dos Estudantes, 5055, Cidade Universitária, 78736-900, Rondonópolis, MT, Brasil. E-mail: tonnyjasilva@hotmail.com.     1 RESUMO   O uso do solo e o seu tipo de cobertura tem sofrido modificações significativas nos últimos anos com o crescimento populacional e desenvolvimento da agricultura. Para obtenção de incrementos de produtividade agrícola uma das tecnologias mais empregadas no Brasil e no mundo é a irrigação. O objetivo dessa pesquisa foi identificar o número de equipamentos e as áreas equipadas com pivôs centrais na bacia hidrográfica do Alto Rio das Mortes no Estado de Mato Grosso, utilizando imagens de satélite de média resolução espacial. A bacia hidrográfica do Rio das Mortes está localizada no Centro-Oeste do Brasil, a qual está inserida na bacia do Rio Araguaia-Tocantins. Foram utilizadas imagens de satélite Landsat e a plataforma do Google Earth Engine (GEE). Foram construídas camadas de Índice de Vegetação por Diferença Normalizada (NDVI) e a partir desses dados procedeu-se a identificação e quantificação das áreas irrigadas por pivô central no local de estudo. Verificamos que a maior concentração de pivôs ocorre nas sub-bacias de Primavera do Leste (213 pivôs, 28 mil hectares) e Poxoréu (31 pivôs, 5 mil hectares). A bacia do Alto Rio das Mortes no ano de 2018 apresentava 271 pivôs centrais, ocupando uma área irrigada de aproximadamente 36,5 mil hectares.   Keywords: geotecnologias, índice de vegetação, irrigação, sensoriamento remoto.     MONCADA, J. V. L.; JOSÉ, J. V.; COSTA, J. O.; QUILOANGO-CHIMARRO, C. A.; OLIVEIRA, N. P. R.; SILVA, T. J. A. INCREASE IN CENTER PIVOT-IRRIGATED AGRICULTURE IN THE RIO DAS MORTES-MT RIVER BASIN     2 ABSTRACT   Land use and land cover have changed significantly in recent years with population growth and the development of agriculture. To obtain increases in agricultural productivity, one of the most used technologies in Brazil and around the world is irrigation. This research identified the amount of equipment and areas equipped by center pivots in the Rio das Mortes River basin in the State of Mato Grosso, using satellite images of medium spatial resolution. The Rio das Mortes River basin is located in center-western Brazil, which is inserted in the Araguaia-Tocantins River basin. Landsat satellite images and the Google Earth Engine (GEE) platform were used. Normalized Difference Vegetation Index (NDVI) layers were constructed, and then the identification and quantification of the areas irrigated by center pivot in the study area were performed. The highest concentration of pivots in the Rio das Mortes River basin is in the sub-basins of Primavera do Leste (213 pivots, 28 thousand hectares) and Poxoréu (31 pivots, 5 thousand hectares). The Rio das Mortes River basin in 2018 had 271 center pivots, occupying an irrigated area of approximately 36.5 thousand hectares.   Keywords: geotechnologies, vegetation index, irrigation, remote sensing.

Sesame is an oilseed, nutritionally important in the world, for its seeds are rich sources of protein and calcium. Fertilizer management is fundamental for the development of this crop and consequently to increase its productivity. In this context, this research aimed to evaluate the initial development of sesame under nutrient omission in the Cerrado of Mato Grosso, Brazil. The experiment was conducted under controlled conditions in a greenhouse, at the Federal University of Rondonópolis. The soil used was Oxisol and the crop used was black sesame. The design was in randomized blocks, with five treatments (absence of nitrogen, absence of phosphorus, absence of potassium, complete fertilization and control (absence of nutrients)) and four repetitions. The variables analyzed were pH, chlorophyll index, plant height, number of leaves, stem diameter, leaf area, aboveground dry mass, root volume, and root dry mass. The pH variable showed a statistical difference 45 days after emergence. The chlorophyll index showed a difference between 30 and 45 days after emergence. The stem diameter, leaf area, plant height, number of leaves, aboveground dry mass, root volume, and dry mass showed a difference among treatments. The absence of nitrogen, phosphorus, and potassium significantly affects the initial development of sesame.