To study the comparative efficiency of different amendments alone and in com- bination with Zn on the progressive chemical changes of an alkali soil, a pot study was conducted with rice as test crop. Application cf amendments and Zm individually and in combinations reudced the soil pH considerably to a significant level. Submergence of soil also contributed to the reduction in soil pH. Electrical conductivity of the soil increased by the application of amendments and Zn. Com- bined application of gypsum at 50% requirement and pressmud reduced the E. S. P. significantly.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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