STUDIES ON THE EFFECT OF URBAN SEWAGE WATER OF TIRUPATI ON THE SOIL PROPERTIES AND YIELD OF RICE
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Date
2018
Authors
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Acharya N.G. Ranga Agricultural University
Abstract
The present investigation was carried out to know the effect of
sewage water on soil properties, accumulation of heavy metals in rice straw
and grains and yield of rice crop in Guravarajupalle village of Renigunta
mandal in Chittoor district of Andhra Pradesh. For this purpose, 100 surface
soil samples, 12 sewage water samples, 100 each straw and grain samples of
rice crop and yield data of the rice crop were collected. Soil samples were
analyzed for physico-chemical and chemical properties and sewage water
samples were analyzed for physico-chemical and chemical properties and
straw and grains of rice crop were analysed for accumulation of heavy
metals.
The sewage water irrigated soils were slightly acidic to strongly
alkaline in reaction, non saline to slightly saline in nature and low to high in
organic carbon. The available nitrogen, P2O5 and K2O in sewage water
irrigated soils were low to high. The available calcium, magnesium and
sodium were found to be sufficient in sewage water irrigated soils.
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The micronutrients such as Fe, Mn, Cu and Zn were deficient to
sufficient in sewage irrigated soils of Guravarajapalle village. The heavy
metals such as Cr, Ni and Pb were within permissible limits except Cd,
which exceeded the permissible limit. The heavy metals in the sewage
waters irrigated soils were in the order of Pb > Ni > Cd > Cr in the study
area.
Sewage water samples were medium to high in pH, low to medium in
EC, high in organic carbon, low to medium in N, low to medium in P,
medium to high in K and low to medium in Ca, Mg and Na. However, the
micronutrients such as Fe, Zn, Mn and Cu were within the permissible limits
in sewage water samples. The heavy metals such as Cr, Ni and Pb were
within permissible limits except Cd, which exceeded the permissible limit in
the sewage water samples. The heavy metals in the sewage waters were in
the order of Cd > Pb > Ni > Cr.
The heavy metals such as Cr, Ni and Pb were within permissible
limits except Cd, which exceeded the permissible limit in straw and grain
samples of rice crop. The heavy metals in straw and grain samples were in
the order of Pb > Ni > Cd > Cr.
The yield of rice crop during kharif, 2016-17 was higher as compared
to that of yield of rice crop during kharif, 2017-18. The higher yields during
kharif, 2016-17 was due to irrigation of soils of Guravarajupalle village with
sewage water. However, the low yields in kharif, 2017-18 was due to the
fact that, more availability of irrigation water due to heavy rains which may
be lead to lower yields due to dilution of the sewage water, which
consequently decreased concentration of nutrients in sewage water causing
less accumulation of nutrients in rice fields.
Description
D5734
Keywords
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