USSLUnited States Salinity Laboratory
USSLUnita Socio Sanitarie Locali (Italian: Local Social Health Authority)
USSLUnited Steel Structures Ltd. (Guangzhou, Guangdong, China)
References in periodicals archive ?
A agua destilada aplicada na lixiviacao diluiu os sais no solo, diminuindo sua salinidade, expressa pela CEes (Tabela 3); no entanto, os valores de PST, mesmo sendo inferiores ao limite de solos sodicos, conforme o USSL (1954), ainda permaneceram elevados para o solo em questao comprometendo, nele, a infiltracao de agua.
He and his USSL colleagues have shown, time and time again, that when seeking certain types of volatilization data, the lab can yield the same results as those painstakingly obtained from complex field studies.
1]) (1) Condutividade eletrica do extrato 1:1; (2) Capacidade de troca de cations; (3) Percentagem de sodio trocavel; (4) Condutividade eletrica do extrato de saturagao; Analises realizadas conforme metodologia recomendada por USSL Staff (1954) Tabela 3.
In some soils, the relationship described by the USSL SAR-ESP model has been shown to vary in response to changes in ionic strength, clay mineralogy, and pH (Lieffering and McLay 1996; Kopittke et al.
From the same soils used to develop the SAR-ESP model, the USSL reported a similar relationship between PAR and exchangeable potassium percentage (EPP), which is described by the PAR-EPP model equation (Richards 1954):
it seems necessary to ascertain whether the widely accepted USSL SAR-ESP model is adequate in predicting sodicity hazard in soils irrigated with winery wastewater with high concentrations of both [K.
The data in our study were incorporated into the USSL SAR-ESP model, whereupon the curve of measured ESP had a greater asymptote relative to the curve of predicted values.
Again, predicted EPP provided by the USSL PAR-EPP model is also presented and is significantly (t(11)=9.
Similar observations were reported by Levy and Feigenbaum (1996), who reported an overestimation of ESP when using the USSL SAR--ESP model in a ternary Na-K--Ca system.
The results of the water samples were tabulated based on USSL classification (Table: 4).
According to USSL classification and Piper's trilinear diagram most of the samples fall under salinity condition.
Sodium Adsorption Ratio Effects Class 0-10 Excellent Low 10-18 Good Moderate 18-26 Fair Medium-High >26 Poor High Table 4: Classification of water samples based on USSL diagram [7].