Papers by Juliano Carlos Calonego
Agronomy
Forage grasses cultivation in production system with soybean and maize is an alternative to impro... more Forage grasses cultivation in production system with soybean and maize is an alternative to improve tropical weathered soils quality in Brazil. The aim of the study was to evaluate the effects in the production systems involving cultivation of Urochloa brizantha cv. Piatã, in monoculture or in succession with soybean and maize crops, on organic matter and structuring of soil in Brazilian savanna. The experiment was implemented in the 2010/2011 season. The treatments consisted of nine production systems and a native forest (savanna) as a reference area. In March 2017, soil sampling was carried out for C and N analysis, physical and chemical fractionation of SOM and aggregate stability. Production systems influenced total organic carbon (TOC) and aggregate stability, mainly in the surface layers, leading to changes in SOM quality. TOC was 31% lower in monoculture soybean production system, when compared to native savanna area, in the 0.00–0.20 m layer. The agricultural production syst...
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Agriculture
It has been shown that the joint application of phosphorus (P) and ammonium (N-NH+4) increases ma... more It has been shown that the joint application of phosphorus (P) and ammonium (N-NH+4) increases maize root proliferation and P acquisition by maize in alkaline soils, but this has not been shown in acidic soils for legumes. A greenhouse experiment was conducted to assess the effect of the joint application of P and NH4+ on soybean root growth and P acquisition. Soybean was grown in glass-walled pots without P, with monoammonium phosphate (MAP) and triple super phosphate (TSP) applied on the soil surface or localized. The soil P increased irrespective of the P source and localization. The rhizosphere pH was decreased by MAP, while the soil bulk pH was not affected. The TSP increased the root length by 55% and MAP by 76% over the control, and the number of root tips increased by 21% with TSP, 58% with MAP applied on the soil surface, and 78% with MAP localized. The soybean dry matter, N and P uptake, and P use efficiency were increased by P fertilization, mainly with MAP localized. The...
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Carbon Balance and Management, 2020
Background A field study with the same crop rotations was conducted to test the hypothesis that t... more Background A field study with the same crop rotations was conducted to test the hypothesis that the soil Carbon fluxes and balances could vary according to the crop species and also mitigate carbon dioxide (CO2) emission. This study aimed to assess the CO2 emission from crop rotations according to C and N inputs from crop residue, the influences on soil organic carbon (SOC) and total soil nitrogen (TN) stocks, identifying the soybean production systems with positive C balance. Triticale (x Triticosecale) or sunflower (Helianthus annuus) are grown in the fall/winter; sunn hemp (Crotalaria juncea), forage sorghum (Sorghum bicolor), pearl millet (Pennisetum glaucum), or fallow are the spring treatments, and soybean as a main crop in summer. Results We found that high C inputs from crop residues modify the C dynamics in crop rotations by reducing the C output (CO2) and increasing C sequestration in the soil. In general, the higher SOC, C stocks, and TN in soil surface were due to higher...
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Geoderma, 2019
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Frontiers in Plant Science, 2021
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COLLOQUIUM AGRARIAE, 2016
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Revista Brasileira de Ciência do Solo, 2008
Este trabalho teve por objetivo avaliar, comparativamente, a capacidade extratora de P da soja (G... more Este trabalho teve por objetivo avaliar, comparativamente, a capacidade extratora de P da soja (Glycine max), milho (Zea mays), braquiária brizantha (Brachiaria brizantha) e milheto (Pennisetum glaucum), submetidos a diferentes doses do fertilizante fosfatado natural fosforita Alvorada, em condições controladas. Utilizou-se um Argissolo Vermelho distroférrico de textura média, corrigido e adubado com N, K e micronutrientes. As espécies foram cultivadas em vasos de 18 dm³ por 50 dias em casa de vegetação, com aplicação de 0, 100, 200 e 400 kg ha-1 de P2O5. As quantidades de fosfato natural foram calculadas com base na teor total de P2O5. O milho, ao contrário da soja, respondeu positivamente ao aumento da dose de P2O5 via fosforita Alvorada. A Brachiaria brizantha cv. Marandu, apesar da menor produção de matéria seca em relação ao milheto, apresentou alta eficiência na absorção de P, mesmo com o fornecido deste nutriente por meio de fonte pouco solúvel. O milheto apresentou-se como i...
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Plant and Soil
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Agronomy Journal, 2022
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Agronomy, 2022
Soybeans [Glycine max (L.) Merrill] have great economic prominence in the world, and soil managem... more Soybeans [Glycine max (L.) Merrill] have great economic prominence in the world, and soil management systems can directly interfere with their yield through changes in soil physical-hydric properties. Thus, the aim of this research was to verify the relationship between yield components, physiological traits, root development, and soil physical-hydric properties in soybean yields grown under conventional tillage and no-tillage systems. The experiment was carried out in Botucatu, SP, Brazil, with two treatments: soybeans grown under conventional tillage and no tillage. It is a long-term experiment, conducted since 1986. The main variables that influenced soybean yield were plant height, relative leaf water content, root dry matter, soil penetration resistance, and soil accumulated water infiltration. Physiological components of the plant and soil water showed a significant and negative correlation with soybean yield. On the other hand, the root development and soil physical component...
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Soil Science Society of America Journal, 2021
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Agrarian, 2013
A cana-de-açúcar é atualmente uma das culturas mais importantes no cenário socioeconômico brasile... more A cana-de-açúcar é atualmente uma das culturas mais importantes no cenário socioeconômico brasileiro, por ser a principal matéria-prima utilizada pela indústria sucroalcooleira para a produção de açúcar e etanol, com poucos estudos dedicados a cana soca. O trabalho foi conduzido com objetivo de avaliar o desenvolvimento e a produtividade da cana-soca, plantada em espaçamentos entrelinhas de 1,0 e 1,5 m, submetida a diferentes doses de adubação nitrogenada de cobertura. O experimento foi conduzido em campo, no município de Presidente Prudente, SP. Utilizou-se o delineamento experimental em blocos completos ao acaso, com quatro repetições, no esquema fatorial 4x2, com parcelas sub-divididas, em que nas parcelas foram instalados os espaçamentos entre sulcos de 1,0 e 1,5 m e nas sub-parcelas a adubação nitrogenada de cobertura na cana-soca com 0, 50, 100 e 200 kg ha-1 de nitrogênio sendo aplicado aos 60 dias após o corte (DAC). Foram realizadas análises de produtividade e oBrix aos nove...
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Agrarian, 2011
A população e o arranjo de plantas afetam a produtividade de milho por interferirem na radiação f... more A população e o arranjo de plantas afetam a produtividade de milho por interferirem na radiação fotossintética ativa e na disponibilidade de água e nutrientes. Objetivou-se avaliar o efeito da população de plantas e do espaçamento entre linhas no crescimento e na produtividade do milho. O experimento foi conduzido em Indiana (SP), no período de 7 de janeiro a 2 de junho de 2008. Os tratamentos foram constituídos por populações de plantas de milho (45, 60 e 75 mil plantas ha-1), combinadas em dois espaçamentos entre linhas (0,45m e 0,90m). O delineamento experimental foi o de blocos ao acaso com quatro repetições em esquema fatorial 3x2. Foram avaliados os parâmetros altura de planta, diâmetro de caule, inserção de espiga, produtividade de grãos e componentes de produção. Os resultados foram submetidos à análise de variância e ao teste de Tukey a 5%. Houve aumento da produtividade de grãos com o aumento da população de plantas de 45 mil para 75 mil plantas ha-1, mesmo havendo sintoma...
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Revista Ceres, 2013
A adubação boratada foliar, na cultura do amendoim, pode ser uma estratégia viável para fornecime... more A adubação boratada foliar, na cultura do amendoim, pode ser uma estratégia viável para fornecimento desse elemento à planta; porém, são poucos os conhecimentos sobre dosagens, épocas e efeitos de parcelamento das doses. O objetivo deste trabalho foi avaliar as características de produção e a composição mineral foliar em diferentes doses, épocas de aplicação e parcelamentos da adubação boratada. O experimento foi conduzido na safra de verão 2010/2011, em Latossolo Vermelho distroférrico, em Rubiácea (SP). Foram estudadas as doses de zero; 0,5; 1,0; 1,5 e 2,0 kg ha-1 de boro (B), aplicadas por via foliar, utilizando-se como fonte o ácido bórico. Os efeitos da adubação boratada foram testados em doses únicas nos estádios V1 ou R5, além do parcelamento da dose de 1,0 kg ha-1 (0,5 kg ha-1 em V1 e R5), de 1,5 (0,75 kg ha-1 em V1 e R5; 0,5 kg ha-1 em V1, R1 e R5) e de 2,0 kg ha-1 (1,0 kg ha-1 em V1 e R5; 0,5 kg ha-1 em V1, R1, R3 e R5). O aumento na produtividade de amendoim em casca ocor...
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Additional file 1: Table S1. Crop sequences used in the experiment since 2003.
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Additional file 2: Table S2. TN, SOC, and stocks at 0-0.1 m, relative and cumulative C-CO2 emissi... more Additional file 2: Table S2. TN, SOC, and stocks at 0-0.1 m, relative and cumulative C-CO2 emissions.
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COLLOQUIUM AGRARIAE, 2020
The expansion of silvipastoral system could be achieved through reform of forage grass monocultur... more The expansion of silvipastoral system could be achieved through reform of forage grass monoculture system in soil with a sandy surface layer, but ranchers are concerned that there may be competition for soil water between the pasture and eucalyptus.The objective of this study was to evaluate the moisture and water available in silvipastoral system and forage grass monoculture in different seasons, distance of eucalyptus trunks or terracesat 1 m depth ina Hapludox soil.Reclamation forage grass monoculture was held with cassava (2008-2010), being the eucalyptus seedlings planted simultaneously to the planting of cassava in August 2008. Two systems of terraces spaced 20 m were evaluated: a) forage grass monoculture stargrass (Cynodon nlemfuensis) system and b) silvipastoral system (2x3) +20 with stargrass forage and eucalypttree(Eucalyptus grandis).The soil water content(θ) was determined in four seasons for eucalyptus tree had 2-3-year-old, from July/2010 to March/2011. Use the follow...
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Nutrient Cycling in Agroecosystems, 2021
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Papers by Juliano Carlos Calonego