STUDIES ON WEED MANAGEMENT IN RAINFED CHILLI + COTTON INTERCROPPING SYSTEM
Loading...
Date
2001-08-02
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A field experiment was conducted during 1991-92 and 1992-93 under rainfed conditions
at Main Research Station, University of Agricultural Sciences, Dharwad. In this experiment, the
effect of weed management treatments on the growth, yield and quality of cotton (DCH-32) and
chilli (Byadagi kaddi) under chilli + cotton intercropping system was studied. Randomized
conylete block design was adopted with four replications.
Among different weed management treatments, higher weed density at all the stages of
crop growth during both the years was observed with weedy check and pendimethalin +
ojqdluorfen (tank mix). Owing to the season long weed-fioe conditions, cent per cent weed
control efficiency (WCE) was recorded with weed-free check. The weed control efiBciency
showed an increased trend with two hand weeding -t- two hoeings (30, 60, 90 and 120 DAT) and
oxyfluorfen (0.2 kg a.L ha-1) foUowed by glyphosate (1.0 kg a.L ha-1) up to 120 DAT and
thereafter it declined. The WCE at 30 and 60 DAT was comparatively lower with pendimethalin
or fluchloralin each at 1.0 kg al ha-1 or oxyfluorfen at 0.1 kg aL ha-1 supplemented with one
hoeing and it was effectively brought up at 90 DAT due to hoeing at 75 DAT. The dry matter
production and nutrient depletion by weeds also followed a similar trend. Number of weeds, dry
matter production and iqrtake of nutrients by weeds were negatively correlated with chilli and
seed cotton yield.
Significantly higher dry chilli yield was obtained from the plots which were kept
weed-free through out the crop growth period (907 kg ha-1) that received two hand weedings and
two hoeings (870 kg ha-1) than in all other treatments except oxyfluorfen followed by glyphosate.
Similarly, weed-free check plots that received multiple Lntercuhivations and hand weedings out
yielded all other treatments in seed cotton yield. Seed cotton yield per ha obtained with two
hand weedings and two hoeings (1284 kg ha-1) was on par with oxyfluorfen followed by
glyphosate (1188 kg ha-1). However these treatments were superior to all other treatments in
seed cotton yield. The increase in the dry chilli and seed cotton yield with oxyfluorfen followed
by glyphosate or conventional method than other treatments may be ascribed to the increase in
growth and yield attributing characters of both chilli and cotton due to effective control of weeds.
Due to higher economic yield and market price of chilli and seed cotton, higher net
income and benefit to cost ratio v»as obtained with weed free check, two hand weedings + two
hoeings and oxyfluorfen followed by glyphosate.
Description
Keywords
null