(1954) 'Diagnosis and improvement of saline and alkali soils.' (United States Department of Agriculture Salinity Laboratory Staff: Washington)
To convert retention data to the retention function parameter using the user-friendly software named RETC (RETention Curve), a computer program developed by USSL
Both groundwater and effluent from the WWTP-C are classed as a good physiochemical water quality for irrigation, with a moderate salinity hazard (C2S1) (USSL
Staff, 1954) and moderate sodicity hazard (C1S2) (Ayers & Westcot, FAO 1985).
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Yates, his USSL
colleagues, and other scientists have investigated several tactics for limiting the escape of fumigant gases.
A third explanation for the black materials is the formation of black alkali caused by the dissolution of organic matter at high pH (USSL
1954; Sou/Dakoure et al.
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Na instalacao do experimento foi utilizada uma amostra de Neossolo Fluvico salino-sodico do Perimetro Irrigado de Custodia, Sertao de Pernambuco, coletado na profundidade de 0-20 cm; apos a coleta a amostra de solo foi secada ao ar, destorroada e passada em peneira de 4 mm para a montagem do experimento e de 2 mm para as analises de caracterizacao quimica e fisica, conforme USSL
Staff (Tabelas 1 e 2).
In addition, the very high salinity water ([C.sub.5]) is not suitable for irrigation under ordinary conditions, but may be used occasionally under very special circumstances in order to ensure adequate drainage and good permeability of soils (USSL
Sodic soils are largely defined from the exchangeable sodium percentage (ESP) of the soil (USSL
Staff 1954; Northcote and Skene 1972; McIntyre 1979; Sposito 1989; Isbell 1996).
The CMB (USSL
1954) under perennial vegetation is assumed to be in a steady-state, with gain from the atmosphere and loss via leaching below the root-zone being equal over time.
Based on USSL
classification majority of the samples both during pre monsoon and post monsoon falls under [C.sub.2][S.sub.1] and [C.sub.3][S.sub.1] class which indicates water is safe for long term for irrigation purposes.