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All publications of “Paulo Guilherme Salvador Wadt”

8 results

The Use of DRIS for Nutritional Diagnosis in Oil Palm in the State of Pará

Gilson Sergio Bastos de Matos, Antonio Rodrigues Fernandes, Paulo Guilherme Salvador Wadt, Antônio José de Abreu Pina, Vinícius Ide Franzini, Helen Monique Nascimento Ramos

09/Mar/2017

ABSTRACT The oil palm crop has expanded significantly in the state of Pará, which has not been followed in a proportional manner by studies aiming at increasing yield through plant nutrition. The objective of this study was to evaluate general and specific norms of the Diagnosis and Recommendation Integrated System (DRIS) for genetic materials of oil palm (African and interspecific hybrid) at two ages (young and adult plants) and evaluate possible deficiencies in fertilization and soil correction practices. The DRIS […]

Nutritional assessment of the irrigated common bean crop by the CND, DRIS, and sufficiency range methods

Fábio Luiz Partelli, Jairo Rafael Machado Dias, Henrique Duarte Vieira, Paulo Guilherme Salvador Wadt, Edmar Paiva Júnior

01/Jun/2014

The common bean crop is of great importance for the State of Goiás, Brazil. However, information on its nutritional requirements is lacking for irrigated conditions. The aim of this study was to establish standard levels of leaf nutrients and assess the nutritional status of irrigated common bean in the Vale do Rio dos Bois region of the State of Goiás through the methods of sufficiency range (SR), compositional nutrient diagnosis (CND), and diagnosis and recommendation integrated system (DRIS), as well […]

Quantification of aluminium in soil of the Solimões Formation, Acre State, Brazil

Thiago Andrade Bernini, Marcos Gervasio Pereira, Lúcia Helena Cunha dos Anjos, Daniel Vidal Perez, Ademir Fontana, Sebastião Barreiros Calderano, [...]

01/Dec/2013

The variety of soils in the State of Acre is wide and their chemical profiles are still not fully understood. The nature of the material of origin of these soils is indicated by the high aluminium (Al) content, commonly associated with high calcium (Ca) and magnesium (Mg) contents. The study objective was to use different methods to quantify Al in soils from toposequences formed from material of a sedimentary nature originating from the Solimões Formation, in Acre, Brazil. Trenches were […]

Nutrition standards for flooded rice by the methods compositional nutrient diagnosis and mathematical chance

Paulo Guilherme Salvador Wadt, Ibanor Anghinoni, Raquel Hermann Pötter Guindani, André Suêldo Tavares de Lima, Aline Peregrina Puga, Gilson Silvério da Silva, [...]

01/Feb/2013

For rice, few studies use foliar analysis methods developed for local conditions of climate, soil or cultivars. The purpose of this study was to evaluate the methods of Compositional Nutrient Diagnosis and of Mathematical Chance to define nutritional standards for rice fields in Rio Grande do Sul state, Brazil. Data of 356 irrigated rice fields for grain yield and foliar contents (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn, and Mo) were used to calculate the sufficiency […]

Dris interpretation criteria for cupuassu orchards

Paulo Guilherme Salvador Wadt, Jairo Rafael Machado Dias, Daniel Vidal Perez, Cleigiane de Oliveira Lemos

01/Feb/2012

The productivity of cupuassu orchards in the Amazon region has been gradually declining, probably due to the reduction in soil fertility, calling for fertilization. In the absence of technical recommendations to calculate the nutrient demand of an orchard, the use of the Integrated Diagnosis and Recommendation (DRIS) may represent an alternative to fill this gap. The purpose of this study was to evaluate the diagnoses based on different formulas and criteria of interpretation of DRIS indices of cupuassu orchards. The […]

Evaluation of agricultural suitability of soils in Acre by different experts

Elaine Almeida Delarmelinda, Paulo Guilherme Salvador Wadt, Lúcia Helena Cunha dos Anjos, Carmem Sueze Miranda Masutti, Ênio Fraga da Silva, Marlen Barros e Silva, [...]

01/Dec/2011

Evaluation systems of agricultural land suitability are being used in different regions of Brazil, by distinct teams and with multiple applications. The objective of this study was to evaluate, for soils in the State of Acre, how different experts evaluate the relative importance of indicators of a land suitability system, and how they interpret properties that can define land suitability classes. Ten soil profiles analyzed for the IX Brazilian Soil Classification and Correlation Workshop were used. These soil profiles are […]

DRIS formulas for evaluation of nutritional status of cupuaçu trees

Jairo Rafael Machado Dias, Paulo Guilherme Salvador Wadt, Daniel Vidal Perez, Lucielio Manoel da Silva, Cleigiane de Oliveira Lemos

01/Dec/2011

DRIS, an Diagnosis and Recommendation Integrated System, is a tool to evaluate the nutritional status of plants. Different DRIS formulas have been proposed to improve the efficiency of the crop nutrition diagnoses. The objective of this study was to compare the nutritional diagnosis of the formulas of Beaufils (1973), of Jones (1981) and of Elwali and Gascho (1984), based on the degree of agreement in commercial orchards of Theobrama grandiflorum trees. Leaf samples of 5 to 18 year-old cupuaçu trees […]

Relationships between soil class and nutritional status of coffee plantations

Paulo Guilherme Salvador Wadt

01/Apr/2005

Farm planning requires an assessment of the soil class. Research suggest that the Diagnosis and Recommendation Integrated System (DRIS) has the capacity to evaluate the nutritional status of coffee plantations, regardless of environmental conditions. Additionally, the use of DRIS could reduce the costs for farm planning. This study evaluated the relationship between the soil class and nutritional status of coffee plants (Coffea canephora Pierre) using the Critical Level (CL) and DRIS methods, based on two multivariate statistical methods (discriminant and […]