Carlos Manoel Pedro Vaz

Brazilian Agricultural Research Corporation

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Sı́lvio Crestana

Brazilian Agricultural Research Corporation

Ricardo Yassushi Inamasu

Brazilian Agricultural Research Corporation

J. C. Franchini

Brazilian Agricultural Research Corporation

J. de M. Naime

Brazilian Agricultural Research Corporation

Eduardo Antônio Speranza

Brazilian Agricultural Research Corporation

L. H. Bassoi

Brazilian Agricultural Research Corporation

J. W. Hopmans

University of California, Davis

Rafael Galbieri

Universidade Federal de Mato Grosso

Renata Alves de Toledo

University of Macau

Sérgio Antônio Spínola Machado

National University of the Littoral

Cooperative Institutions

Brazilian Agricultural Research Corporation

117

Universidade de São Paulo

Universidade Federal de São Carlos

Agricultural Research Corporation

Universidade Estadual Paulista (Unesp)

Methodist University of Piracicaba

Universidade Brasil

University of Nebraska–Lincoln

National Council for Scientific and Technological Development

Cotton (United States)

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Áreas de produção de algodão em Mato Grosso: nematoides, murcha de fusarium, sistemas de cultivo, fertilidade e física de solo.

Rafael Galbieri J. F. V. Silva G. L. Asmus Carlos Manoel Pedro Vaz F. M. Lamas

A producao de algodao no estado de Mato Grosso e comprovadamente eficiente e rentavel. A cada safra aumentam a tecnificacao da cultura e o conhecimento acumulado. Reflexo disso e o crescimento da area ocupada por essa cultura em Mato Grosso, que representa mais de 50% do algodao plantado no pais. No entanto, problemas relacionados a ocorrencia de nematoides e doencas a eles associadas vem crescendo e preocupando os produtores. Existem varios exemplos de inviabilidade de areas em funcao desses parasitas, principalmente em locais que foram tradicionais no cultivo do algodoeiro. Praticas de manejo deverao ser incentivadas para reduzir ou pelo menos manter estavel o problema. Para que a melhor estrategia possa ser utilizada, alem de quantificar quais sao as especies presentes, e fundamental conhecer o sistema de producao no qual atua o produtor, o historico da area, bem como as condicoes fisicas e quimicas do solo. O trabalho aqui relatado enfoca um esforco nesta direcao, realizado em parceria entre o Instituto Mato-grossense do Algodao (IMAmt), a Associacao Mato-grossense dos Produtores de Algodao (AMPA), o Instituto Brasileiro do Algodao (IBA), a Associacao dos Produtores de Sementes de Mato Grosso (Aprosmat) e quatro unidades da Empresa Brasileira de Pesquisa Agropecuaria (Embrapa): a Embrapa Agrossilvipastoril, Embrapa Algodao, Embrapa Instrumentacao e Embrapa Agropecuaria Oeste.

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Predicting bulk density in Brazilian soils for carbon stocks calculation: a comparative study of multiple linear regression and Random Forest models using continuous and categorical variables

Discover Soil. (2025)

Wharley Pereira dos Santos Carlos Manoel Pedro Vaz Ladislau Martin‐Neto Adriano Anselmi Javier Tomasella

Categorical variable

10.1007/s44378-025-00035-6

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INSTRUMENTED CITRUS PRODUCTION

Acta Horticulturae (2009)

André Torre-Neto Carlos Manoel Pedro Vaz D. M. B. P. Milori Lúcio André de Castro Jorge L. M. Rabello

Despite the notable technological support that has made the Precision Agriculture feasible around the world, there are still opportunities for the development of instrumentation and automation in this area.These opportunities are more plentiful considering perennial crops and the traceability of agricultural products.The Precision Agriculture has been developed more intensively for grains what gives chances for the development of technological tools for site-specific management of perennial crops, like citrus.Besides, the traceability of fruits is an immediate and strategic necessity in order to face non-economical issues for exporting, like phytosanitary measures.Therefore, for developing countries like Brazil it is very important the development of technologies to identify the origin and the history of fruits, that can potentially figure among its major exporting products.For the last five years, at the Embrapa Agricultural Instrumentation Center, in Brazil, some of these opportunities have been explored, in order to start the development of an information system and associated tools to make possible the integration of traceability and the site-specific management system for perennial crops.The use of sensors, fixed and on-board instrumentation, wired and wireless network and advanced methodologies have been accomplished to implement precision agriculture and traceability for citrus.The main problems that have been faced are: phytosanitary control, spraying control, automation of fertirrigation and evaluation of product quality.

10.17660/actahortic.2009.824.11

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Microstructural Assessment of Cancellous Bone Using 3D Microtomography

Journal of Physics Conference Series (2011)

A M H Silva José Marcos Alves O L Da Silva Nathalia Felicio da Silva Mário Gazziro

Cancellous bones have a porous microstructure and can be modeled as linear elastic solid, heterogeneous and anisotropic. Few studies regarding the morphometric analysis of trabecular bone samples with 3D microtomography have been published so far. The technique has spread worldwide for the characterization of trabecular structures in studies related to bone quality and its relationship with metabolic diseases bone like osteoporosis. In our study cancellous bone samples with cubic and cylindrical geometry were extracted from bovine femur were used to investigate the structural arrangement of bone through high resolution x-ray 3D microtomography (μCT). Four trabecular microstructural parameters (tissue volume, bone volume, bone volume fraction and tissue surface) were measured by 2D (stereological method) and 3D morphometric analysis using the software CTan Analyser supplied by the manufacturer of the microtomograph (SkyScan, model 1172, Belgium). The measurements were done in three main directions (superior-inferior, medial-lateral and anterior-posterior) to investigate the correlation between the 2D and 3D morphometric analysis. The results show a high correlation between the analysis. The x-ray 3D microtomography technique has a great potential for the assessment of bone quality.

X-ray microtomography

Cancellous bone

10.1088/1742-6596/313/1/012008

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Soil carbon stocks and stability across an altitudinal gradient in southern Peru

Journal of Soil and Water Conservation (2011)

A. Segnini Adolfo Posadas Roberto Quiroz D. M. B. P. Milori Carlos Manoel Pedro Vaz

Carbon accumulation and sequestration in Andean soils are scarcely documented. Carbon contents, carbon stocks, and stability were determined in five Peruvian agroecologies, along a 1,000 km (621 mi) transect covering the arid Pacific coast, the Andean high plateau, and the tropical highland rainforest in the eastern flank of the Andes. It was hypothesized that the carbon stocks and stability varied with land use and altitudinal gradient. Results showed that the soils in the tropical highland rainforest site presented the higher (p > 0.05) carbon contents (134 g kg⁻¹ [13.4%]). Coffee plantations in the tropical highland rainforest and alfalfa under irrigation in the dry valleys presented larger (p > 0.05) carbon stocks (83 Mg ha⁻¹ [37 tn ac⁻¹]) than primary rainforests. The dry lowlands showed the lowest carbon contents (51 g kg⁻¹ [5.1%]) and carbon stocks (40 Mg ha⁻¹ [18 tn ac⁻¹]). Soil organic carbon increased with elevation in the arid environments. In the high plateau potato systems, low carbon contents (68 g kg⁻¹ [6.8%]) and carbon stocks (47 Mg ha⁻¹ [21 tn ac⁻¹]) were found. The soils in both the tropical highland rainforest and the dry valleys presented lower humification index, when compared to other agroecologies. Humification increased with soil depth due to the presence of recalcitrant carbon, while at the surface the presence of labile carbon dominates as a result of a constant input of plant residues. Results suggest that diversified production systems with crops and livestock are more stable for carbon stocks, which might be essential to help farmers adapting to the effects of climate change. Therefore, viable land uses, from the carbon economy perspective, must be promoted to support sustainable agricultural practices for most important ecological conditions.

Carbon fibers

Soil carbon

Humus

Tropical rain forest

10.2489/jswc.66.4.213

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Lime movement through highly weathered soil profiles

Environmental Research Communications (2019)

Márcio Renato Nunes J. E. Denardin Carlos Manoel Pedro Vaz Douglas L. Karlen Cynthia A. Cambardella

Abstract Applying lime is a fundamental practice for abating acidity in highly weathered soil, but better management strategies for no-till systems are needed to prevent surface pH elevation with little to no subsurface effects. This study was conducted to quantify chemical changes within the soil profile in response to lime and straw applications under both greenhouse and field conditions. Four controlled environment experiments (soil columns) and one field study were conducted on soils classified as Rhodic Hapludox and Rhodic Eutrodox. The soil column experiments evaluated four lime rates (0, 3.9, 7.8, or 15.6 Mg ha −1 ) and four straw rates (0, 4, 12 and 16 Mg ha −1 ) either individually or in combination. Lime treatments were surface applied or incorporated in the top 5-cm, while straw treatments were incorporated in the top 5-cm. In the field, lime rates of 0, 8.3 and 33.2 Mg ha −1 were incorporated into the 0 to 10-cm depth in both a soybean [ Glycine max] monoculture and diversified cropping system with white oat ( Avena sativa ), soybean, black oats ( Avena strigosa ), corn ( Zea mays ) and wheat ( Triticum aestivum ). Both field and soil columns studies showed minimal lime movement into the soil profile with chemical changes being limited to 2.5-cm below where it was applied or incorporated regardless of cropping system. Surface application of high lime rates promoted chemical stratification resulting in dramatic increases in topsoil pH and exchangeable Ca and Mg levels with minimal mitigation of subsurface soil acidity. Other studies also suggest that lime movement into the soil profile can vary depending on the experimental condition. Therefore, additional investigations across a wider geographic area, greater range of weather and climatic conditions, methods and rates of lime application need to be conducted to improve lime recommendation for high weathered soil managed using no-till practices.

Soil horizon

Avena

Topsoil

10.1088/2515-7620/ab4eba

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Extração em larga escala do resíduo de construção e demolição reciclados para correção da acidez dos solos

F. H. L. Brandao Paulo Renato Orlandi Lasso C. R. de Oliveira A. C. de C. Bernardi W. T. L. da Silva

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Comparative study of determining methods of soil water retention curve.

IRRIGA (2010)

Paulo Nascimento L. H. Bassoi Vital Pedro da Silva Paz Carlos Manoel Pedro Vaz J. de M. Naime

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Estimation of Water Retention Curve for Soils of Bahia, Brazil, Based on Soil Particle-Size Analysis

Journal of Agricultural Science (2018)

Felipe Gomes Frederico da Silveira Luciano da Silva Souza L. D. Souza J. de M. Naime Carlos Manoel Pedro Vaz

Soil water retention curve (SWRC) is an important soil attribute because it is a soil quality indicator and is fundamental to study water dynamics in the soil-plant-atmosphere system. Since the conventional SWRC determination is laborious and time-consuming, making it difficult to process a large volume of samples, pedotransfer functions have been used to estimate it by using other soil physical attributes easily determined. Thus, this study aimed to apply Arya-Paris model to SWRC estimation for soils of Bahia state, Brazil, based on soil particle-size analysis, and to compare estimated and determined data of SWRC. Samples were collected from horizons A and AB and/or B and/or C, for a total of 15 soils and 62 horizons. Particle-size was determined by automatic soil particle-size analyzer (PSA) based on g-ray attenuation and traditional Bouyoucos’ hydrometer (BH) method. Arya-Paris model showed better SWRC predictions for sandy soils, followed by clayey, loamy, and very clayey soils. Good model performance was observed for all soils together. The α 1 scaling factor provided better predictions, followed by α 3, and α 2 showed unsatisfactory behavior. BH method, using only 7 soil particle-size fractions, gave slightly higher predictions than PSA using 30 soil particle-size fractions.

Pedotransfer function

Soil test

Soil texture

Particle (ecology)

10.5539/jas.v10n12p126

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Application of Standard EPC/GEN2 UHF RFID Tags as Soil Moisture Sensors

Rafael Vidal Aroca André Carmona Hernandes Daniel Varela Magalhães Marcelo Becker Carlos Manoel Pedro Vaz

This paper presents a system to estimate soil moisture through the reading of standard Ultra High Frequency (UHF) passive Radio Frequency Identification (RFID) tags that can be buried in the soil, allowing wireless moisture measurement without the need of using batteries in the field for long periods. In the proposed system, one or more passive EPC/GEN2 tags acts as sensors buried in the soil. The system dispenses external cables and antennas and may be composed of a single RFID tag buried in a specific soil depth or by several RFID tags buried at different depths. An antenna coupled to a RFID reader can be pointed to the place of installation of these tags, and by measuring the received signal strength indicator (RSSI) and other variables, direct estimation of the water content can be done. In addition to its simplified installation procedure, the system allows manual and automatic robotic reading through irrigation systems or other systems for irrigation scheduling.

SIGNAL (programming language)

10.3390/ecsa-3-s5001

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Citations (11)