Effect of zinc applications under different types of salinity in wheat
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Date
2014
Authors
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Journal ISSN
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Publisher
CCSHAU
Abstract
Two screen house experiments were conducted to study the relative tolerance of wheat (Var.
KRL-210) and interactive effect of zinc with different types of salinity on wheat crop. In first
experiment, the treatment consisted of two types (Cl- and SO4
-2 dominated) with the four levels 0, 4, 8
and 12 dS m-1 of salinity. In the second experiment, interactive effect of different zinc levels (0, 5, 10
and15 ppm) with chloride and sulphate dominated salinity was investigated on yield and uptake of
wheat. Both the experiments were replicated thrice in a factorial completely randomized design and the
desired types of salinity were created using chloride and sulphate salts of the Na+, Ca+ and Mg2+.
Germination of wheat delayed was more in chloride dominated salinity at 8 and 12 dS m-1 as compared
to sulphate dominated salinity. No effect at 0 and 4 dS m-1 in both types of salinity in germination.
With the increasing salinity levels from 0 to 12 dS m-1 there was a decrease in the biomass, grain and
straw yield of wheat. However, the magnitude of decrease in the wheat yield resulted from the increase
in salinity.
There was a decrease in mean grain yield of wheat from 9.12 to 6.41 g pot-1 and 9.41 to 7.17 g
pot-1 in chloride and sulphate dominated salinity, respectively, as salinity levels increased from 4 to 12
dS m-1. The reduction in grain yield, biomass and chlorophyll ‘a’ and chlorophyll ‘b’ was more in case
of chloride dominated salinity as compared to sulphate dominated salinity. The increased levels of Zn
from 0 to 15 ppm in soil resulted in increase of both grain and straw yield by 34.1and 36.7 per cent,
respectively, over non saline soil. The mean Zn uptake across all the salinity levels decreased from
93.95 to 68.05 μg pot-1 (27.6%) and 109.87 to 78.43 μg pot-1 (28.6%) in chloride and sulphate
dominated salinity, respectively, in wheat plant at boot stage. Similarly, in wheat straw at maturity it
decreased from 54.83 to 34.75 μg pot-1 (36.6%) and 61.89 to 43.81 μg pot-1 (29.2%) in chloride and
sulphate dominated salinity, respectively. The decrease was prominent in case of Cu, Fe and Mn also
across all the salinity levels.
The mean ECe, water soluble Na+, Ca+, Mg2+, Cl- and SO4
-2 increased with increase in the
salinity level from 0 to 12 dS m-1 across all the Zn levels and these increasing concentrations in soil
affect the wheat crop. Availability of DTPA extractable Zn, Cu, Fe and Mn was decreased as the
salinity levels increased from 0 to 12 dS m-1 and this affect can be reduced by increasing levels of Zn
from 0 to 15 ppm. Therefore, Zn mitigates the effect of salinity.
Description
Keywords
Zinc, Salinity, Chloride, Sulphate, Micronutrients, Wheat