Long-term effects of five ameliorants on a saline-sodic soil of South Africa

Rooyen, P. C. Van; Weber, Herbert

doi:10.1016/0016-7061(77)90029-5

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Rainy season: i) prevent the destruction of aggregates on the soil surface (surface mulching) (Mclntyre 1958;Chen et al 1980;Agassi et al 1981); 2) Prevent the dispersion of Na-type clay mineral (formation of Ca-type clay mineral and/or stabilization of aggregates by organic material application) (Pak and Tsuyurupa 1976;Van Rooyen and Weber 1977;Prather et al 1978;Oster and Frenkel 1980;Gobran et al 1982;Shainberg and Gal 1982;; 3) promote salt leaching and removal of Na salt (formation of aggregates to accelerate infiltration and active removal of Na salt with Ca materials) (Pak and Tsuyurupa 1976;Van Rooyen and Weber 1977;Prather et al I978;Oster and Frenkel 1980;Gobran et al 1982;Shainberg and Gal 1982;; 4) enhance the soil buffering capacity (application of organic materials) (Pak and Tsuyurupa 1976;Van Rooyen and Weber 1977).…”

Section: Effects Of Amelioration Treatments On Physical and Chemmentioning

confidence: 99%

Studies on saline soils in Khon Kaen Region, Northeast Thailand

Patcharapreecha

Topark-Ngarm

Goto

et al. 1990

Soil Science and Plant Nutrition

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The effects of several amelioration treatments on the physical and chemical properties of the saline soils (Paleustult) in the Khon Kaen Region, Northeast Thailand, were studied. The application of CaS04, CaCOa, converter slag, or compost into the plow layer, the placement of crude oil or rice husks below the plow layer and rice straw mulching were compared.The plots with these treatments were constructed in the field and the moisture content, pH, EC, permeability, clay dispersion, NH4-N and NO~-N contents were determined. The evaluation of each amelioration treatment was as follows. Compost application was the most effective, followed by mulching. The addition of adequate, but not excessive amounts of calcium materials was necessary to increase the soil buffering capacity. The crude oil and rice husk plots showed very wide seasonal pH fluctuations as in the case of the control plot.To simulate rainfall infiltration, a leaching experiment was conducted using soils collected periodically from the above plots. The turbidity level (clay dispersion) of the leachate of CaS04 and CaCOa plot soils was much lower than that of the other plot soils. Compost application also had a suppressive effect on clay dispersion. Clay was dispersed easily in soils from the rice husk and crude oil plots and a high turbidity level of the leachate was observed for the rainy season samples of these plots. By mulching, dispersion was strongly suppressed, which may be due to the stability of the soil aggregates.Leaching speed was negatively correlated with the clay dispersion and it remained high throughout the experimental period (2 years) in the CaS04, CaC03, converter slag, and compost plots.Therefore, the combination of compost and calcium application to the soil with mulching was considered to be a suitable procedure for the amelioration of this kind of soil.

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Section: Effects Of Amelioration Treatments On Physical and Chemmentioning

confidence: 99%

Studies on saline soils in Khon Kaen Region, Northeast Thailand

Patcharapreecha

Topark-Ngarm

Goto

et al. 1990

Soil Science and Plant Nutrition

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Long‐term changes in the floristic composition and soil characteristics of reclaimed sodic land during eco‐restoration

Srivastava

Baleshwar

Behera

et al. 2011

Z. Pflanzenernähr. Bodenk.

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The study was conducted under the “Uttar Pradesh Sodic Lands Reclamation Project” to examine changes that occurred in the reclaimed sodic land in two districts of Uttar Pradesh, India. The study focuses on long‐term seasonal changes in the floral diversity and soil characteristics of the reclaimed sodic land over a period of 10 y. The changes in the floristic composition, plant density, and soil characteristics (microbial biomass carbon [MBC], pH, exchangeable‐sodium percentage (ESP), and electrical conductivity) were compared among the different study plots after different years of sodic‐land reclamation. The study plots comprised reclaimed land with rice–wheat cultivation; semireclaimed land under rice cultivation only and nonreclaimed barren sodic land. There was a significant variation in the floristic composition of the three study plots. Dominance in the floristic composition was shifted from monocotyledonous weeds in the nonreclaimed sodic land to dicotyledonous weeds in the reclaimed land after 10 y of reclamation. Among the soil characteristics, the most remarkable changes were observed in soil MBC and ESP during the course of sodic‐land reclamation. Soil MBC increased up to 480% and ESP values decreased up to 79% in the reclaimed plots with reference to the nonreclaimed plots. The soil amelioration was more pronounced in the upper layer (0–30 cm) as compared to the lower layer (below 30 cm depth). A positive significant correlation was revealed between soil MBC and floristic composition of the reclaimed plots. These changes in floristic composition and soil characteristics could be used as good indicators of the eco‐restoration of the sodic lands. The present study provides useful insights in understanding the temporal progress of eco‐restoration in the reclaimed sodic lands.

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