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International Journal of Horticulture. 2015, Vol. 5, No. 2, 1-8
http://ijh.biopublisher.ca
6
Table 6 Effect of integrated weed management practices on dry matter production (kg
·ha
-1
) in turmeric-
kharif
, 2012
Treatment
60
DAP
120
DAP
180
DAP
240
DAP
T
1
PE metribuzin 0.7 kg·ha
-1
+ HW on 45 and 75 DAP
2387
5167
9561
11518
T
2
PE metribuzin 0.7 kg·ha
-1
+ POE fenoxaprop 67 g·ha
-1
+ metsulfuron 4 g·ha
-1
(Tank
mix) on 45 DAP
1296
2351
5195
6785
T
3
PE metribuzin 0.7 kg·ha
-1
+ straw mulch 10 t·ha
-1
on 10 DAP + HW on 75 DAP
1580
3083
6330
8423
T
4
PE pendimethalin 1.0 kg·ha
-1
+ HW on 45 and 75 DAP
2271
4906
9156
11172
T
5
PE pendimethalin 1.0 kg·ha
-1
+ POE fenoxaprop 67 g·ha
-1
+ metsulfuron 4 g·ha
-1
(Tank mix) on 45 DAP
1242
2209
4976
6406
T
6
PE pendimethalin 1.0 kg·ha
-1
+ straw mulch 10 t·ha
-1
on 10 DAP + HW on 75 DAP
1912
3939
7658
10006
T
7
PE atrazine 0.75 kg·ha
-1
+ HW on 45 and 75 DAP
1673
3324
6704
8796
T
8
PE atrazine 0.75 kg·ha
-1
+ POE fenoxaprop 67 g·ha
-1
+ metsulfuron 4 g·ha
-1
(Tank
mix) on 45 DAP
1207
2119
4836
6229
T
9
PE atrazine 0.75 kg·ha
-1
+ straw mulch 10 t ha-1 on 10 DAP + HW on 75 DAP
1851
3783
7416
9852
T
10
PE oxyfluorfen 0.30 kg•ha-1 + HW on 45 and 75 DAP
2162
4586
8661
10610
T
11
PE oxadiargyl 0.25 kg·ha
-1
+ HW on 45 and 75 DAP
1612
3165
6457
8384
T
12
POE glyphosate 1.03 kg·ha
-1
on 25 DAP + HW on 45 and 75 DAP
1537
3832
7492
9895
T
13
POE glyphosate 1.54 kg·ha
-1
on 25 DAP + HW on 45 and 75 DAP
1549
3004
6208
8368
T
14
HW on 25, 45 and 75 DAP
2238
4784
8967
10799
T
15
Unweeded check
1110
1868
4413
5635
SEd
86
147
301
439
CD (P=0.05)
177
301
616
899
and it was at par with PE pendimethalin 1.0 kg·ha
-1
+
HW on 45 and 75 DAP (T4) and hand weeding at 25,
45 and 75 DAP (T14). More plant dry matter
production with pre-emergence application of
metribuzin 0.7 kg·ha
-1
+ HW on 45 and 75 DAP might
be due to lesser weed competition, as weeds might
have been killed from their germination phase and
keeping weeds at lower density. Superiority of
metribuzin in controlling board spectrum of weeds
reduced the weed density and thus weed dry weight
resulted in higher plant dry matter was earlier reported by
Suryanarayana Reddy (1993). In general reduction in
nutrient removal by weeds through suitable weed
management practices enhanced the nutrient uptake and
dry matter production of the crops (Kaur et al., 2008).
2.3 Number of tillers
The treat mental effects on the number of tillers
plant-1observed at various stages are presented in
Table 7. In general, the tiller production continued up
to 180 DAP. The formation of tiller was highly
influenced by different weed management treatments.
During kharif 2012, in all the stages of observation,
pre-emergence application of metribuzin 0.7 kg·ha
-1
+
HW on 45 and 75 DAP recorded (T1) significantly
higher number of tillers plant-1. This was comparable
with PE pendimethalin 1.0 kg·ha
-1
+ HW on 45 and 75
DAP (T4) and hand weeding at 25, 45 and 75 DAP
(T14). The number of tillers plant-1 was moderate in
PE oxyfluorfen 0.30 kg·ha
-1
+ HW on 45 and 75 DAP
(T10) and PE metribuzin 0.7 kg·ha
-1
+ straw mulch 10
t·ha
-1
on 10 DAP + HW on 75 DAP (T3). Pre-
emergence application of metribuzin 0.7 kg·ha
-1
+ HW
on 45 and 75 DAP recorded significantly higher number
of tillers plant-1 than other treatments at all the stages in
both the years (Table 5). This might be due to very
effective suppression of weed flora by the herbicide at
early stage of the crop and subsequent removal of late
emerging weeds by hand weeding at 45 and 75 DAP and
eventually resulted in higher number of tillers in turmeric.
This finding is in conformity with the results of
Channappagoudar et al. (2007).
Acknowledgement
The research have been supported and facilitated by Tamil
Nadu Agriculture University. Tamil Nadu. India. I extend my