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Influence of leaching with gypsum and compost of rice straw on improvement of Salt Affected Soil and Rice Growth
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Abstract: A study was conducted to investigate the efficiency of leaching process with gypsum, and compost, and their combination on improvement an unproductive salt affected soil, the rice growth and nutrient uptake. Columns were packed with the salt affected soil collected from northern Nile Delta. The treatments were gypsum in rates of 0, 3, 6, and 9 Migagrame/feddan ( Mg fed.-1), compost in rates of 10 and 20 Mg fe.-1 and combination of 3 gypsum with compost 10 Mg fed.-1. The columns were saturated with tap water, and transplanted with rice. Successive leaching was done with same volume of irrigation water. The percolated water volume and its electrical conductivity (ECd) were measured. Soil physical and chemical properties and plant analysis were done.
The results indicated that absolute differences in leachate volumes, due to leaching process, were relatively small for no amended soil and increased with gypsum application rates. The percolation of water through the gypsum treated soil columns was much faster than control indicating that gypsum was the main factor to percolate process. Compost with gypsum was more effective than compost alone. Electrical conductivity of percolated water (ECd ) values had a sharply decreasing then after the third leaching a slight decreasing was recorded with gypsum treatments. However, the ECd values had the same trend, but the slight decreasing was retarded until the 4th leaching with compost treatments. The mean value of ECd in leachate was reduced from 32.83 to 4.63 dSm-1. This decrease was a function of the leaching numbers of the soil.
Consequently, leaching the soil treated with gypsum was more effective in removing the total soluble salts (TSS). Leaching with compost did not create a sodification hazard and ESP obtained values at the end of leaching were lower than the control. As expected the increasing gypsum rates decreased ESP. Moreover, a high degree of soil improvement was realized when leaching began with gypsum+ compost and ESP value was decreased to 11.49.
The results revealed that the rice shoot dry weight was increased from 9.29 to 29.01 g/column as gypsum rates increased from zero to 9 Mg fed-1. The corresponding value for compost was 25.03 g/column at 20 Mg fed.-1. The combined effect of compost and gypsum was greater than individual (40.05 g/column). Nitrogen and phosphorus content in rice dry matter was increased with compost application while they were not significantly affected by gypsum application rates. In addition K content was not significantly affected. The Na content was lower, however Ca and Mg content was higher in gypsum compared with compost treatments. Thus, it can be said that leaching the salt affected soil with gypsum plus compost was entirely safe. This treatment is more profitable than the leaching with water only
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| URL |
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| Publication year |
2006
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| Pages |
214-221
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| Availability location |
- 8 ش الجامعه - مركز البحوث الزراعية - الجيزه Soils, Water and Environment Research Institute, ARC
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| Availability number |
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| Organization Name |
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| City |
Alexandria
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| serial title |
Alexandria Science Exchange
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| ISSN |
1110-0176
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| Department |
Soil Salinity and Alkalinity Res. Lab.
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| Author(s) from ARC |
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| Agris Categories |
Soil erosion, conservation and reclamation
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AGROVOC
TERMS |
Composts.
Gypsum.
Leaching.
Rice.
Rice straw.
Saline soils.
Soil improvement.
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| Publication Type |
Journal
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