STATUS AND NUTRITION OF ZINC AND IRON IN RICE AND SOILS OF DIFFERENT AGRO-CLIMATIC ZONES OF KARNATAKA
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Date
2014-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
An investigation was conducted to study the status of Zn and Fe content in
rice genotypes and soils across different agro climatic zones (ACZ) of Karnataka
and for Zn and Fe content and its uptake in rice following soil and / foliar
application of their different sources under aerobic and wetland cultivation. The
grain and straw Zn content across 64 rice genotypes ranged from 7.8 to 51.3 mg
kg-1 and 16.6 to 284.0 mg kg-1, respectively. The grain and straw Fe content
ranged from 9.6 to 88.8 mg kg-1 and 39.7 to 437.5 mg kg-1, respectively. In
general, 36 per cent of soil samples collected representing eight ACZ were below
the critical limit of 0.6 mg kg-1 Zn in soil. All the soil samples were above the
critical limit of 4.5 mg kg-1 Fe in soil.
The Zn and Fe content and its uptake by rice grain and straw in field
experiment and grain, straw and root in PVC pipe experiment was higher in
aerobic and wetland rice cultivation, respectively. Rasi genotype recorded higher
Zn and Fe content and their uptake by grain, straw and root under both aerobic and
wetland cultivation.
Application of different sources of Zn and Fe to soil and foliar combination
recorded higher content of Zn and Fe in grain and straw compared to soil
application alone. Zn-EDTA and Fe-EDTA performed better than ZnSO4 and
FeSO4 based on per unit of Zn/Fe application in achieving higher Zn and Fe
content, respectively in grain and straw in all the experiments.
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