Pressure response of the soil water sampler and possibilities for simultaneous soil solution sampling and tensiometry

1993 ◽  
Vol 30 (4) ◽  
pp. A233
Keyword(s):  
Soil Water ◽  
Soil Solution ◽  
Pressure Response ◽  
Water Sampler

SOIL WATER CONTENT AFFECTS THE AVAILABILITY OF PHOSPHATE

1985 ◽  
pp. 185-189
Author(s):  
M.C.H.Mouat Pieter Nes
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Solution ◽  
Equivalent Reduction

Reduction in water content of a soil increased the concentration of ammonium and nitrate in solution, but had no effect on the concentration of phosphate. The corresponding reduction in the quantity of phosphate in solution caused an equivalent reduction in the response of ryegrass to applied phosphate. Keywords: soil solution, soil water content, phosphate, ryegrass, nutrition.

A Constant-Potential Soil Water Sampler

1983 ◽  
Vol 47 (3) ◽  
pp. 606-608 ◽  
Author(s):  
H. Riekerk ◽  
L. A. Morris
Keyword(s):  
Soil Water ◽  
Water Sampler ◽  
Constant Potential

A system for obtaining soil solution extracts and soil water retention curves using a bench centrifuge with fixed angle rotors

Geoderma ◽  
2020 ◽  
Vol 361 ◽  
pp. 114063
Author(s):  
J.C. Lozano ◽  
P. Blanco Rodríguez ◽  
F. Vera Tomé ◽  
R. Maldonado ◽  
A.S. Medeiros ◽  
...  
Keyword(s):  
Soil Water ◽  
Soil Solution ◽  
Water Retention ◽  
Soil Water Retention ◽  
Fixed Angle

Solution concentrations of nutrient ions below the rooting zone of a sugar maple stand: relations to soil moisture, temperature, and season

1993 ◽  
Vol 23 (4) ◽  
pp. 617-624 ◽  
Author(s):  
Xiwei Yin ◽  
Neil W. Foster ◽  
Paul A. Arp
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Solution ◽  
Sugar Maple ◽  
Temporal Variations ◽  
Solution Chemistry ◽  
Rooting Zone ◽  
Temperature Solution ◽  
Turkey Lakes Watershed

Temporal variations of ion concentrations in soil solution were analyzed in relation to soil percolate volume, soil water content, soil temperature, solution chemistry, and season. The study site was an uneven-aged, mature northern tolerant hardwoods dominated by sugar maple (Acersaccharum Marsh.) within the Turkey Lakes Watershed, Ontario. Six ions were investigated: nitrate (NO3−), sulfate (SO42−), calcium (Ca2+), magnesium (Mg2+), potassium (K+), and ammonium (NH4+). Nitrate concentrations in the soil solution depended on season during the nonfoliage period and responded directly to forest floor percolation, soil water content, and season during the foliage period. Variations of SO42−, Ca2+, and Mg2+ concentrations were mostly attributable to NO3− concentration, and to season to a lesser extent. Concentrations of K+ and NH4+ correlated only weakly to any of the "independent" variables included in the analysis, reflecting a high affinity between these ions and the soil colloids.

Nitrate leaching under different levels of irrigation for three turfgrasses in southern Puerto Rico.

1969 ◽  
Vol 92 (3-4) ◽  
pp. 135-152
Author(s):  
José Paulino-Paulino ◽  
Eric W. Harmsen ◽  
David Sotomayor-Ramírez ◽  
Luis E. Rivera
Keyword(s):  
Puerto Rico ◽  
Soil Water ◽  
Soil Solution ◽  
Color Index ◽  
Root Zone ◽  
Irrigation Management ◽  
Bermuda Grass ◽  
N Leaching ◽  
Irrigation Level ◽  
Irrigation Levels

Inadequate nutrient and irrigation management of turfgrass may result in nitrate (N03) losses by leaching, and may contribute to elevated N03-N concentrations in groundwater. A field study was conducted to evaluate the effect of three irrigation levels on the N03-N concentration in soil solution and the mass of total N03-N lost by leaching for three grasses: Bermuda [Cynodon dactylon (L.) Pers.], Centipede [Eremochloa ophiuroides (Munro.) Hack], and Zoysia manila [Zoysia matrella (L.) Merr.]. The study was conducted at Juana Díaz, Puerto Rico, on a San Antón soil (fine-clayey, montmorillonitic, isohyperthermic Cumulic Haplustolls) from June 2001 until September 2002. Soil water N03-N concentrations below the root zone were obtained from water samples collected from suction lysimeters. The levels of irrigation applied were 75,100 and 125% of the daily evapotranspiration (ET), calculated by using the pan evaporation method. Grass was fertilized with 165 kg N/ha/yr, split into four applications. The Bermuda grass exhibited the highest rate of horizontal growth (cover), reaching maximum cover in 45 days, whereas the others reached maximum cover in 120 days. Bermuda grass was the most efficient in reducing the loss of N03-N, with a mean annual soil water concentration below the root zone of 3.24 mg/L, whereas Zoysia and Centipede grasses were less efficient with mean annual soil water concentrations below the root zone of 17.4 and 17.8 mg/L, respectively. The soil solution concentration of N03-N did not change significantly for the Bermuda grass with increases in the level of irrigation. However, lower mean annual N03-N concentrations were observed for the Centipede and Zoysia grasses at the irrigation levels of 100% and 75% ET, with mean values of 14.0 and 11.1 mg/L, respectively. The Bermuda grass had an acceptable color index at the 100% ET, and resulted in decreased N03-N concentrations and mass losses. On the other hand, Zoysia and Centipede grasses presented a commercially acceptable color index and minimal N03-N leaching at the 75% ET irrigation level. The results from this study provide valuable information related to water and nutrient management for the turfgrass industry in southern Puerto Rico.

An alternative method for determination of cations in solution of small soil samples

1969 ◽  
Vol 75 (3) ◽  
pp. 223-231
Author(s):  
Gustavo A. Martínez ◽  
David R. Bouldin
Keyword(s):  
Soil Water ◽  
Soil Solution ◽  
Soil Samples ◽  
Alternative Method ◽  
Water Ratio

A series of equations based on relations between exchangeable and soil solution ions were evaluated to find an appropriate procedure to determine the activity of cations in soil solution of small soil samples. The effectiveness of the developed equations was maintained even when the sample was submitted to variations in the type of salt added to the soil in the soil water ratio (SWR) used to extract the ions in solution.

scholarly journals TEOR DE POTÁSSIO NA SOLUÇÃO DO SOLO COM USO DA TÉCNICA DE REFLECTOMETRIA NO DOMÍNIO DO TEMPO

Irriga ◽  
2005 ◽  
Vol 10 (4) ◽  
pp. 409-418
Author(s):  
Tibério Santos Martins da Silva ◽  
Eugênio Ferreira Coelho ◽  
Vital Pedro da Silva Paz ◽  
Lucas Melo Vellame ◽  
Gessionei Da Silva Santana
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Soil Solution ◽  
Time Domain ◽  
Potassium Concentration ◽  
Soil Disturbance ◽  
Time Domain Reflectometry ◽  
Ion Concentration ◽  
Bulk Electrical Conductivity ◽  
Water Sampler

TEOR DE POTÁSSIO NA SOLUÇÃO DO SOLO COM USO DA TÉCNICA DE REFLECTOMETRIA NO DOMÍNIO DO TEMPO  Tibério Santos Martins da Silva1; Eugênio Ferreira Coelho2; Vital Pedro da Silva Paz3; Lucas Melo Vellame1; Gessionei da Silva Santana41Universidade Federal da Bahia, Cruz das Almas, BA tibé[email protected] Mandioca e Fruticultura, Cruz das Almas, BA3Departamento de Engenharia Agrícola, Universidade Federal da Bahia, Cruz das Almas, BA4Universidade Federal de Viçosa, Viçosa, MG  1 RESUMO A avaliação do teor de íons no solo no manejo da fertirrigação é complexa devido a dificuldade de obtenção em tempo real e com o mínimo de alterações na estrutura do solo. Este trabalho teve como objetivo estimar o teor de potássio na solução do solo, a partir de modelos matemáticos ajustados, em função da condutividade elétrica da solução do solo (CEw) coletada por extrator de solução, da umidade (q) e da condutividade elétrica aparente do solo (CEa) obtidas por um equipamento de reflectometria no domínio do tempo (TDR). Os modelos estimaram razoavelmente a Cew e a reflectometria no domínio do tempo mostrou-se adequada para o monitoramento da concentração de potássio na solução do volume de solo molhado. UNITERMOS: TDR.  SILVA, T. S. M. da.; COELHO, E. F.; PAZ, V. P. da. S.; VELLAME, L. M.; SANTANA, G. da. S.; POTASSIUM CONCENTRATION IN SOIL SOLUTION USING TIME DOMAIN REFLECTOMETRY TECHNIQUE  2 ABSTRACT The evaluation of ion concentration in the soil under fertirrigation is complex due to the difficulty of obtaining it in real time, with a minimum of soil disturbance. This work aimed to estimate potassium concentration in soil solution as a function of soil solution electrical conductivity (CEw) collected by using water sampler, soil water content (q) and bulk electrical conductivity (CEa) obtained using a time domain reflectometry equipment (TDR). The models estimated reasonably CEw and time domain reflectometry was suitable for potassium concentration monitoring of wet soil volume solution. KEYWORDS: TDR. 

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