UTILIZATION OF DISTILLERY SPENTWASH FOR RECLAMATION OF SODIC SOIL AND FERTIIRRIGATION STUDIES IN RICE
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Date
2009-09-22
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University of Agricultural Sciences GKVK, Bangalore
Abstract
The raw distillery spentwash samples from M/s Chamundeshwari Distilleries
Private Limited, K.M.Doddi, Maddur Taluk, Mandya district revealed that it was highly
acidic (pH 4.11), with the electrical conductivity of 17.70 dS m-1. The concentration of
nitrogen, phosphorus and potassium were 0.19, 0.03, and 0.88 per cent respectively and
also has good amount of calcium and magnesium content of 2600 and 1700 mg L-1
respectively.
In the green house experiment I, raw spentwash application @5.0 lakh liters ha-1
significantly reduced the pH, exchangeable sodium and ESP of soil at 30 and 60 days
after application and the reduction was marginal there after upto 120 days. Application of
gypsum @ 100% GR had similar effect in reducing the soil pH and ESP as that with raw
spentwash application @ 2.5 lakh liters ha-1.
In the field experiment highest grain and straw yield and nutrient uptake were
recorded in raw spentwash @ 5.0 lakh liters ha-1 and 7.5 lakh liter ha-1, gypsum amended
plots and control recorded lowest yield. Reduction in soil pH ,exchangeable sodium and
ESP was maximum in plots receiving 5.0 lakh liters ha-1 followed by 7.5 lakh liters ha-1
and highest exchangeable calcium and magnesium content was recorded in plots
receiving 5.0 lakh liters ha-1 followed by 7.5 lakh liters ha-1 which was significantly
superior over plots receiving gypsum and control.
In the green house ferti-irrigation experiment II, highest yield and nutrient uptake
were noticed with application of DSW 150% RDN (in 33% in each irrigation) followed
by 150% N through urea in (33% in each irrigation) and RDF (NPK) + FYM.
In the field experiment II ferti-irrigation of primary spentwash on reclaimed sodic
soil highest grain, straw yield and nutrient uptake were recorded in RSW @ 100%
GR+100% RDN through SW (3splits) and lowest was recorded in T1 which received
gypsum @50% GR + Recommended NPK. Reduction in soil pH, sodium and ESP was
maximum in T9 (RSW @ 100% GR+100% RDN through SW (3splits)) and minimum in
T1 (Gypsum@50% GR+ Rec.NPK).
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