National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A long-term field experiment was carried out with green manuring to see the impact on Zinc transformations in calcareous soil under rice-wheat cropping system. After completion of 5th cycle, Soil samples were collected from each plot and Zinc transformation process was executed. The distribution of native and applied Zn into different fractions indicated that most of the total-Zn remains in residual form and the quantity in plant usable forms like water soluble + exchangeable, complexed and organic form were very low which were about 0.34 to 0.91, 1.00 to 1.46 and 1.17 to 1.91 per cent, respectively of the total Zn. The order of dominancy of different fractions in soil was : residual Zn > crystalline sesquioxide Zn > organically complexed Zn > inorganically complexed Zn > amorphous sesquioxide Zn > water soluble + exchangeable Zn. Mutual transformation of water soluble + exchangeable Zn, organically Zn, crystalline sesquioxide Zn and residual Zn, seem to be dominant for maintaining Zn- equilibria in soil. The correlation and multiple regression were very well explained the importance of water soluble + exchangeable, organically complexed Zn and crystalline sesquioxide bound Zn in providing sustainable crop production by maintaining Zn-nutrition to crops under rice-wheat system. The existence of dynamic equilibria among different Zn-fractions as evident from significant correlation among themselves indicated that there is mutual transformation of Zn fractions to maintain Zn equilibria in soil. In conclusions, Dhaincha as well as Green gram plus FYM enhances WSE and ORG-Zn, which are most important for Zn nutrition to Rice-wheat.
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