Data/hora: 05/06/2024 08:00:11

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 09/02/1996
Data da última atualização: | 09/02/1996
Autoria: | WANG, P. L.; YANG, P. C.; CHANG, Y. T.; YAO, T. P.
Título: | Leaching of a saline-sodic soil.
Ano de publicação: | 1985
Fonte/Imprenta: | Taiwan Sugar, v.32, n.3, p.12-18, 1985.
Idioma: | Inglês
Conteúdo: | Leaching experiments were conducted on saline sodic soils at Chiku Plantation, Chiali Sugar Factory. The test was carried out with concentric cylinders having diameters of 40 cm, as used for infiltration rate measurements. The cylinders were pressed into the soil for about 10 cm and filled with water to a depth of 16 cm. Desalinization proceeds rapidly under leaching. After four months of leaching, the electric conductivity of saturation extract was decreased from above 56,25 mmhos/cm to below 4 mmhos/cm. Changes in soil pH values during the leaching period were small. They fluctuated between 7,8 and 8,4 but were never higher than 8,5. Although the sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) of soils before leaching were very high, the soils were still saline in nature because they contained a large amount of lime. For this reason, both SAR and ESP decreased simutaneously with salt content during the leaching process. From the desotification leaching curve, it is concluded that  in reclamation of these soils there is no need of the application of any amendment such as gypsum or lime, mainly because Ca++ and Mg++ present in soils are adequate to replace the initially high exchangeable sodium during leaching. Different theoretical models were tested by comparing the calculated and experimental leaching fractions. The results indicated that theoretical leaching fractions were well correlated with field data actually observed.
Palavras-Chave: | Desalinization; Lime; Saline soil.
Thesagro: | Calcário; Dessalinização; Gesso; Lixiviação; Ph; Sódio; Solo Salino.
Thesaurus Nal: | gypsum; leaching; sodium.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (5006-1) - ADC - SP - -- -  -  - 1993.04832 - DIS