RESPONSE OF MAIZE-COWPEA SEQUENCE TO TREATED SUGAR MILL EFFLUENT IRRIGATION UNDER DIFFERENT NUTRIENT AND MOISTURE REGIMES IN CAUVERY COMMAND AREA
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Date
2018-11-20
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University of Agricultural Sciences, GKVK Bengaluru
Abstract
A field experiment was conducted on the “Response of maize-cowpea sequence
to treated sugar mill effluent irrigation under different nutrient and moisture regimes in
Cauvery command area” in the premises of Research and Development Farm of M/s Sri
Chamundeshwari Sugars Limited, K.M. Doddi, Maddur taluk, Mandya District during
Kharif and Rabi/Summer 2016-17 and 2017-18. The experiment had twelve treatments
with three replications. The results revealed that significantly higher grain (124.4 q ha-1)
and stover (193.0 q ha-1) yield of maize was obtained with application of treated sugar
mill effluent (TSME) with amendment (gypsum) + SSNM for targeted yield of 120 q ha-
1. Nutrient uptake and soil properties viz., available soil nutrients N, P2O5 and K2O after
harvest of maize significantly differed with treatments receiving treated sugar mill
effluent with amendment (gypsum) + SSNM for targeted yield of 120 q ha-1 (T12),
Whereas lower uptake of N, P, K was noticed with fresh water + RDF. With respect to
residual effect of the treatments on the succeeding cowpea, higher seed yield (955kg
ha-1), nutrients uptake and soil available nutrients was recorded with TSME with
amendment (gypsum) + SSNM for targeted yield of 120 q ha-1 as compared to all the
other treatments in maize-cowpea sequence. The second experiment was laid out in split
plot design with 12 treatments combinations and replicated thrice. The experiment
consisted of six main plot treatments of IW/CPE and two sub plot treatments (mulching
and without mulching). Kernel and stover yield of maize was recorded higher with the
treatment receiving 0.9 IW/CPE ratio with treated sugar mill effluent with sugarcane
trash mulching (79.8 and 162.7 q ha-1, respectively) compared to other treatment
combinations. Treatment with 0.5 IW/CPE ratio with fresh water (59.6 and 100.1 q ha-1,
respectively) across all the treatments resulted in lower kernel and stover yield. Similar
trend was observed in growth and yield parameters, economics, nutrient uptake and soil
properties.