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| Neves,Antonia Leila Rocha; Lacerda,Claudivan Feitosa de; Teixeira,Adunias dos Santos; Costa,Carlos Alexandre Gomes; Gheyi,Hans Raj. |
| Abstract Cowpea crop is of great importance for northeast Brazil. The objective of this work was to evaluate the application of saline water in different developing stages on plant growth and changes in soil characteristics, measured by soil coverage, and on yield of cowpea plants. The experiment was conducted under field conditions, during the dry season in a completely randomized block design with five treatments and five replications. Each experimental unit consisted of 4 lines of plants with 5.0 m long. The treatments evaluated were: 1. irrigation with groundwater with electrical conductivity (ECw) of 0.8 dS m-1 during the whole crop cycle; 2. saline water (5.0 dS m-1) during the whole crop cycle; 3, 4 and 5. saline water (5.0 dS m-1) up to 22nd,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Image classification; Salinity of the water; Salt tolerance. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000100059 |
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| Costa,Carlos Alexandre Gomes; Lopes,José Wellington Batista; Pinheiro,Everton Alves Rodrigues; Araújo,José Carlos de; Gomes Filho,Raimundo Rodrigues. |
| The purpose of this study was to represent the soil moisture in the profile corresponding to the root zone from TDR sensors in a preserved area of the Caatinga biome and analyze the spatialized moisture adjustment equations under different layers of the soil profile. For that, we analyzed three classes of soil (red yellow Ultisol; Hypochromic Luvisol; Udorthent) in the Aiuaba Experimental Watershed, located in the semiarid zone of northeastern Brazil. The hydro-physical parameters representing the soil water retention (field capacity, wilting point and residual moisture) were collected in four campaigns, in six points and in the profiles corresponding to the effective root depth, totaling 216 samples. For the evaluation of the regression models, we used... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caatinga; Soil; Time domain reflectometry. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400004 |
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| Guimarães,Claudinei Martins; Costa,Carlos Alexandre Gomes; Carneiro,Leandro Flávio; Assunção,Hildeu Ferreira da. |
| ABSTRACT The technique of Time Domain Reflectometry (TDR) is important in the evaluation of soil moisture due to being an instantaneous method, which is non-destructive, precise and little dependent on environmental factors. However, researchers have emphasised the need for continuous specific calibration for each soil-management situation. The aim of this work therefore, was to evaluate the response of a portable TDR sensor to soil moisture in a Dystroferric Red Latosol in the Cerrado, under three different systems of soil management and at three different depths in the soil profile. To do this, TDR equipment consisting of two rods, each 0.12 m in length, was used for instantaneous measurement of the volumetric water content of the soil. The depths of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil water content; Soil management; Dielectric permittivity; Cropping systems; Time domain reflectrometry.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100001 |
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