EFFECT OF WEED MANAGEMENT PRACTICES ON NUTRIENT REMOVAL BY WEEDS AND ITS RELATION TO YIELD OF CROPS IN EASTERN DRY ZONE OF KARNATAKA
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Date
2009-07-15
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University of Agricultural Sciences, Bangalore
Abstract
An investigation was under taken to study effect of weed
management practices on nutrient removal by weeds and its relation to
yield of crops in eastern dry zone of Karnataka at MRS, Hebbal,
Bangalore. Different weed management practices involving herbicides,
mechanical weeding, hand weeding and intercropping were imposed in
three major crops viz. finger millet, groundnut and maize. The results
revealed that in finger millet, weed nutrient uptake recorded lowest in
hand weeded plots compared to others, with 9.95, 1.08, 4.94, 3.65, 2.99,
1.74 kg ha-1 N, P, K, Ca, Mg, S respectively. In finger millet highest grain
and straw yield was obtained in butachlor applied plots (4436.15 kg ha-1
and 8295 kg ha-1). In groundnut, pendimethalin applied plots recorded
lowest nutrient uptake by weeds with 18.91, 2.15, 9.52, 3.32, 2.69, 3.07
kg/ha of N, P, K, Ca, Mg, S respectively. The yield in pendimethalin 1.00
kg a.i. ha-1 at 3 DAS and hand weeding at 20 and 40 DAS are on par
with each other with 1564 kgha-1 and 1668 kgha-1 respectively. In maize
crop weed uptake was reduced to minimum with 15.22kg N, 1.66 kg P,
7.26 kg K, 2.67 kg Ca, 2.23 kg Mg and 2.69 kgha-1 of S in hand weeded
plots. Because of better control of weeds, higher maize grain (7257kgha-1
grain and 9680 kg ha-1 straw yield) yield in maize with cowpea intercrop
and pendimethalin (30EC 0.5 kg a.i. ha-1 3 DAS) was obtained. Efficient
control of weeds is necessary to increase the yield. By controlling weeds
we can reduce the uptake of nutrients by them, there by making it
available to crops and reduce the cost on excess nutrients. We can go for
combination of chemical, mechanical and hand weeding, so that we can
achieve maximum weed control and higher yields.
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