Results 31 to 40 of about 241,983 (189)

The temporal stability of the variability in apparent soil electrical conductivity

Bioscience Journal, 2016
Apparent soil electrical conductivity (ECa) measurements can be used for crop management in precision agriculture. However, ECa is a soil attribute that presents spatial and temporal variability.
Wilker Nunes Medeiros, Daniel Marçal de Queiroz, Domingos Sárvio Magalhães Valente, Francisco de Assis de Carvalho Pinto, Christiane Augusta Diniz Melo   +4 more
doaj   +3 more sources

Convergência de tecnologias emergentes na área agronômica e engenharia agrícola. [PDF]

, 2020
O objetivo do artigo é propor uma metodologia para estudos de convergência de tecnologias emergentes na área agronômica e de engenharia agrícola, utilizando conceitos como os mapas tecnológicos.
ARAUJO, M. de, MANTOVANI, E. C., YEGANIANTZ, L.   +2 more
core  

Use of water from small alluvial aquifers for irrigation in semi-arid regions. [PDF]

, 2011
Water from small alluvial aquifers constitutes an attractive and low-cost option for irrigation and rural development in Northeastern Brazil. Based on piezometric measurements, geochemical analyses and electrical conductivity estimates, the present case ...
Burte, Julien Daniel Pierre, Coudrain, Anne, Marlet, Serge   +2 more
core   +4 more sources

Growth, Development, and Water Consumption of Irrigated Bean Crop Related to Growing Degree‐Days on Different Soil Tillage Systems in Southeast Brazil

International Journal of Agronomy, Volume 2016, Issue 1, 2016., 2016
Degree‐days may be an alternative for predicting the influence of temperature on physiological aspects of plants in a changing climate. The objective of this research was to evaluate the relation between cumulative degree‐days index (∑G) and the development, growth, and water consumption of irrigated bean under different soil tillage systems (STS).
Gerson Araujo de Medeiros, Luiz Antonio Daniel, Felipe Hashimoto Fengler, David Clay   +3 more
wiley   +1 more source

Spatial Dependence of Physical Attributes and Mechanical Properties of Ultisol in a Sugarcane Field

The Scientific World Journal, Volume 2015, Issue 1, 2015., 2015
This study investigates the effect of conventional tillage and application of the monoculture of sugar cane on soil health. Variables like density, moisture, texture, consistency limits, and preconsolidation stress were taken as indicators of soil quality.
Uilka Elisa Tavares, Mário Monteiro Rolim, Veronildo Souza de Oliveira, Elvira Maria Regis Pedrosa, Glécio Machado Siqueira, Adriana Guedes Magalhães, Jorge E. Gonzalez   +6 more
wiley   +1 more source

USO DE FERRAMENTAS DA INTERNET NO ENSINO DO SENSORIAMENTO REMOTO NO CURSO DE GRADUAÇÃO EM ENGENHARIA AGRÍCOLA

Revista Brasileira de Engenharia Agrícola e Ambiental
RESUMO Esta pesquisa consistiu no desenvolvimento de uma metodologia de ensino, a partir da utilização de ferramentas da INTERNET, para a disciplina de Sensoriamento Remoto I, ministrada no DEAg (Departamento de Engenharia Agrícola) da UFPB (Universidade
Edilberto Bezerra de Sousa, Ana Lúcia Bezerra Candeias   +1 more
doaj   +1 more source

Using Soil Apparent Electrical Conductivity to Optimize Sampling of Soil Penetration Resistance and to Improve the Estimations of Spatial Patterns of Soil Compaction

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
This study presents a combined application of an EM38DD for assessing soil apparent electrical conductivity (ECa) and a dual‐sensor vertical penetrometer Veris‐3000 for measuring soil electrical conductivity (ECveris) and soil resistance to penetration (PR).
Glécio Machado Siqueira, Jorge Dafonte Dafonte, Javier Bueno Lema, Montserrat Valcárcel Armesto, Ênio Farias França e Silva, Antonio Paz González   +5 more
wiley   +1 more source

Chemical Attributes of Soil Fertilized with Cassava Mill Wastewater and Cultivated with Sunflower

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
The use of waste arising from agroindustrial activities, such as cassava wastewater, has been steadily implemented in order to reduce environmental pollution and nutrient utilization. The aim of this study is that the changes in chemical properties of dystrophic red‐yellow latosol (oxisol) were evaluated at different sampling times after reuse of ...
Mara Suyane Marques Dantas, Mário Monteiro Rolim, Anamaria de Sousa Duarte, Ênio Farias de França de Silva, Elvira Maria Regis Pedrosa, Daniel da Costa Dantas, Susana Rodríguez-Couto   +6 more
wiley   +1 more source

Using Multivariate Geostatistics to Assess Patterns of Spatial Dependence of Apparent Soil Electrical Conductivity and Selected Soil Properties

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
The apparent soil electrical conductivity (ECa) was continuously recorded in three successive dates using electromagnetic induction in horizontal (ECa‐H) and vertical (ECa‐V) dipole modes at a 6 ha plot located in Northwestern Spain. One of the ECa data sets was used to devise an optimized sampling scheme consisting of 40 points.
Glécio Machado Siqueira, Jorge Dafonte Dafonte, Montserrat Valcárcel Armesto, Ênio Farias França e Silva, Ana Maria Tarquis   +4 more
wiley   +1 more source

Influence of Corn (Zea mays L.) Cultivar Development on Grain Nutrient Concentration

International Journal of Agronomy, Volume 2012, Issue 1, 2012., 2012
While corn productivity has been increased by the adoption of high‐yield hybrids, there are concerns that increased grain potential may be associated with diminished grain nutrient concentration. Ten corn (Zea mays L.) cultivars representing five technological levels (landrace variety, commercial variety, and double, triple, and single cross‐hybrids ...
Carla Fernanda Ferreira, Antônio Carlos Vargas Motta, Stephen A. Prior, Carlos Bruno Reissman, Nicolas Z. dos Santos, Juarez Gabardo, David Clay   +6 more
wiley   +1 more source