CHARACTERIZATION AND UTILIZATION OF DIFFERENT SILICON SOURCES FOR RICE (Oryza sativa L.)
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Date
2016-04-04
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Different Si sources used in this study varied greatly in their physico - chemical properties and behavior in acidic, neutral and alkaline soils. Total Si content of the Si sources ranged from 2.20 - 34.84 per cent and alkalinity to Si ratio (A/Si) ranged from 1.29- 9.08. The relative Si extracted by various extractants irrespective of Si sources was in the order of HCl + HF (112.13 %) > 0.5 M HCl (79.22 %) > 5 % citric acid (55.51 %) > 0.5 M acetic acid (51.95 %) >0.005 M H2S04 (42.56 %) > NaOAc (33.58 %) > 0.5 M N&OAc (29.30 %) > 40mM P buffer (28.34 %) > Na2C03 + N& N03 - l (21.98 %) > Na2C03 + NH4 N03 - 2 (19.32 %) > distilled water - 2 (11.94 %) > 0.01M CaCh (4.80 %) > distilled water - 1 (3.52 %). Si extracted from different Si sources with Na2C03+ N&NOr 2 method noticed higher correlation with total Si uptake by rice treated with Si @ 250 and 500 kg Si ha-1 in all the three soils. Application of Si sources significantly increased both CaCh and acetic acid extractable Si in all the three soils. 0.01M CaCh extractable Si was found to be the ideal measure for plant available Si in soils treated with different Si sources. In acidic and neutral soil, significant correlation was obtained between R- PASc (relative increase in plant available Si) and RUSic (relative uptake of Si) at 60 DAI (r = 0.660** and 0.693** respectively). In alkaline soil, significantly high correlation was obtained at 120 DAI (r = 0.732**). Similar trend was obtained with R- PASc and relative uptake in these soils. Application of calcium silicate and rice hull @ 500 kg Si ha-1 in field experiments recorded the highest grain and straw yield in acidic and alkaline soils respectively.
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