Calibração da Reflectometria no Domínio do Tempo (TDR) para a estimativa da concentração da solução no solo

Souza, Claudinei Fonseca; Folegatti, Marcos Vinícius; Matsura, Edson Eiji; Or, Dani

doi:10.1590/s0100-69162006000100030

Cited by 38 publications

(31 citation statements)

References 13 publications

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“…In order to find the relationship between ECTDR and ECS, it was used the equation (3), described below by Souza et al (2006), where the concentration of soil solution should be estimated as a function of volumetric soil water content, which makes possible the relation between the measured electrical conductivity (ECTDR) and the electrical conductivity of the soil solution (ECS). …”

Section: Methodsmentioning

confidence: 99%

“…According to Souza et al (2006), the equation (4) In order to evaluate the macronutrient quantity in the plants leaf from different treatments leaves were sampled according to the Trani and Raij (1997) recommendations. Newly developed leaves were collected from the flowering to the half of the plant cycle totalizing 25 leaves per treatment.…”

Section: Methodsmentioning

confidence: 99%

“…For the latter, Souza et al (2006) suggests the existence of a strong correlation between wet surface area and the saturated disk for sandy soils. From surface wet area in soil estimates the authors observed an expansion of the wet surface area correlated to the evolution of the saturated disk (small amount of water that accumulates on the soil surface during the process of infiltration) for the different flow rates studied, 2, 4 and 8 L h -1 .…”

Section: Distribution Of Soil Solutionmentioning

confidence: 97%

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Soil Solution Dynamics for Drip Fertigation Management in Bell Pepper Crop

Santoro¹,

Pires²,

Peres³

et al. 2018

R_I

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The success of drip irrigation compared to various other irrigation systems is attributed primarily to its superior water delivery to plant root zones and high efficiency in water use. This work aimed at studying the distribution and storage of soil solution in the soil profile, and the uptake of nutrients through the roots of pepper plants, irrigated through a drip fertigation system at two flow rates, 2 and 4 L h -1 . The experiment was conducted within a greenhouse with plants grown in a medium-textured Oxisol for 120 days. Water and ionic concentration were concurrently measured using TDR probes in the soil profile (at depths ranging from 0.1 to 0.6 m). The root system of plants irrigated with drippers of 4 L h -1 had an area of 69.3 cm 2 while plants irrigated with drippers of 2 L h -1 presented an area of 45.2 cm 2 . The yield of pepper plants were 0.19 kg m -2 and 0.27 kg m -2 for treatments with 2 L h -1 and 4 L h -1 , respectively, supporting the results obtained for nutrients distribution and root development. There was higher tendency for nutrient loss in the treatment with 2 L h -1 , increasing risks of groundwater contamination. The dripper with flow rate of 4 L h -1 was more efficient at distributing and storing water and nutrients in the soil profile, which improved the crop yield. RESUMOA irrigação por gotejamento possibilita a aplicação de água e nutrientes na região das raízes da planta e tem contribuído para obtenção de elevada eficiência no consumo da água e dos nutrientes. Essa vantagem tem contribuído pelo aumento no interesse na adoção deste método de irrigação em relação a outros, no entanto, adequado manejo da água e dos nutrientes deve ser adotado. Neste contexto, o objetivo foi avaliar a distribuição e armazenamento de solução do solo e a absorção de nutrientes de raízes de plantas de pimentão aplicados por fertirrigação em irrigação por gotejamento com emissores com vazões distintas, 2 e 4 L h -1 . O experimento

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Distribution Of Soil Solutionmentioning

confidence: 97%

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Soil Solution Dynamics for Drip Fertigation Management in Bell Pepper Crop

Santoro¹,

Pires²,

Peres³

et al. 2018

R_I

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“…According to Embrapa (1997), the usual saturation-extract method for evaluating soil salinity is time and space-limited since its results represent the soil conditions at the sampling moment and for the tested soil volume. Time-domain reflectometry (TDR) may be a suitable procedure for the indirect determination of apparent soil electrical conductivity (EC soil ) under field conditions, not only in view of the real time readings but also of the minimal disturbance of the soil structure (Robinson et al, 2003;Nadler, 2004;Coelho et al, 2005;Souza et al, 2006). However, TDR devices must be calibrated to the specific characteristics of each soil (Hamed et al, 2003), by collecting equipment data and reference values and relating them (Cichota, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…However, to estimate this parameter, the characteristic probe impedance must be determined (Souza et al, 2006), which can be done when it is wrapped in a uniform dielectric material .…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity of soil irrigated with swine wastewater estimated by time-domain reflectometry¹

Soncela¹,

Sampaio

Boas

et al. 2011

Rev. Bras. Ciênc. Solo

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Decreasing Nitrate Leaching in Vegetable Crops with Better N Management

Agostini¹,

Tei

Silgram

et al. 2010

Genetic Engineering, Biofertilisation, Soil Quality and Organic Farming

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The relatively low cost of fertiliser and the increasing demand and competition for cheap food have encouraged the over-fertilisation of field vegetables over the past few decades. However, more recent scientific and public concern over eutrophication of water and the accumulation of nitrates in vegetables for human consumption requires a more effective use of nitrogen fertilisers in a more sustainable manner, which minimises the potential risk of negative effects on the environment and human health. In this review, we present the current state of the art in knowledge of N dynamic in vegetable crops and the latest advances in nutrient management, which could be used to mitigate nitrate losses from vegetables fields to the wider environment. Findings are based on published data and personal communications with researchers and consultants across Europe. Areas of research where further work is required are identified and described. A conclusive chapter reports on the economic and environmental impact of technology transfer of improved nitrogen management in three south European states and in the Netherlands.

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Calibração da Reflectometria no Domínio do Tempo (TDR) para a estimativa da concentração da solução no solo

Cited by 38 publications

References 13 publications

Soil Solution Dynamics for Drip Fertigation Management in Bell Pepper Crop

Soil Solution Dynamics for Drip Fertigation Management in Bell Pepper Crop

Electrical conductivity of soil irrigated with swine wastewater estimated by time-domain reflectometry¹

Decreasing Nitrate Leaching in Vegetable Crops with Better N Management

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