Evaluation of different integrated weed control methods in spring maize (Zea mays L.)
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Date
2016
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Publisher
CCSHAU
Abstract
A field experiment was conducted at Regional Research Station, Uchani, Karnal of CCS Haryana
Agricultural University, Hisar, Haryana (India) during spring 2016. The experiment was laid out in
Randomized Block Design (RBD) which was replicated three times and comprising eighteen
weed control treatments viz. atrazine 750 g ha-1 PRE (T1), atrazine 750 g ha-1 fb 2,4 D 500 g ha-1 at 30
DAS (T2), atrazine 750 g ha-1 fb 1 hoeing at 30 DAS (T3), One hoeing at 20 DAS fb atrazine 750 g ha-1
at 30 DAS (T4), alachlor 2.0 kg ha-1 PRE (T5), alachlor 2000 g ha-1 fb hoeing (T6), alachlor 1.0 kg ha-1
PRE fb 2,4 D 500 g ha-1 at 30 DAS (T7), atrazine 375g ha-1 + alachlor 1.0 kg ha-1 PRE (T8), tembotrione
120 g ha-1 + surfactant 1000 ml ha-1 (T9), tembotrione 140 g ha-1 + surfactant 1000 ml ha-1 (T10),
alachlor 2000 g ha-1 as PRE fb tembotrione 120 g ha-1 + S (T11), metribuzin 400 g ha-1 PRE (T12),
metribuzin 500 g ha-1 PRE (T13), atrazine 750 g ha-1 as PRE fb tembotrione 120 g ha-1 + S (T14), manual
hoeing (T15), mechanical hoeing at 20 & 40 DAS (T16), weedy check (T17) and weed free (T18).
Important weed species observed in the experimental plots were Cyperus rotundus (sedges), Anagallis
arvensis, Eclipta alba, Ageratum conyzodies, Coronopus didymus (broad leaf weeds), Brachiaria
reptans and Dactyloctenium aegyptium (grassy weeds). All weed control treatments significantly
reduced the total weed population and dry matter accumulation by weeds as compared to weedy check.
Application of alachlor 2000 g ha-1 as PRE fb tembotrione 120 g ha-1 + S (T11), atrazine 750 g ha-1 as
PRE fb tembotrione 120 g ha-1 + S (T14), tembotrione 140 g ha-1 + surfactant 1000 ml ha-1 (T10),
tembotrione 120 g ha-1 + surfactant 1000 ml ha-1 (T9) provided excellent control of all types of weeds at
all stages of the crop growth. Maximum weed control efficiency (99.7%) was observed with
application of alachlor 2000 g ha-1as PRE fb tembotrione 120 g ha-1 at 25 DAS + S at all stages of the
observation. Higher growth, yield, yield attributes and return over variable cost were recorded with
alachlor 2000 g ha-1 as PRE fb tembotrione 120 g ha-1 + S (T11), being at par with atrazine 750 g ha-1 as
PRE fb tembotrione 120 g ha-1 + S (T14), tembotrione 140 g ha-1 + surfactant 1000 ml ha-1 (T10),
tembotrione 120 g ha-1 + surfactant 1000 ml ha-1 (T9) over weedy check. None of the herbicide except
metribuzin PRE (400 & 500 g ha-1) caused toxicity to green maize crop. Higher doses of metribuzin
caused 20-45% toxicity to maize crop which mitigated within 10-15 days after spray. Higher B: C ratio
(2.41) was obtained in alachlor 2000 g ha-1 as PRE fb tembotrione 120 g ha-1 + S followed by
tembotrione 120 g ha-1 + surfactant 1000 ml ha-1 (2.38), atrazine 750 g ha-1 as PRE fb tembotrione 120 g
ha-1 + S (2.37), tembotrione 140 g ha-1 + surfactant 1000 ml ha-1 (2.37) and lowest in weedy check
(1.54).