Screening of Weed Competitive Cultivars
difformis (sedges); and Croton bonplandianum, Physalis
significantly the highest number of grassy weeds
minima, Cleome viscosa, Amaranthus spinosus, Solanum
and of total weeds which was statistically at par
nigrum, Euphorbia hirta, Heliotropium indicum and
with that of ‘B 105’ and ‘B 1’ under weedy situation.
Ludwigia parviflora (broadleaved) were recorded.
Similar results were observed in case of sedge and
Croton bonplandianum among broadleaved , Digitaria
broadleaved population. When one hand weeding
sanguinalis among grasses and Cyperus rotundus
was applied at 30 DAS, weed density at 45 DAS did
among sedges were most predominant weeds
not vary significantly among the cultivars. Weed
throughout the crop season.
dry weight also varied significantly with different
treatments. The lowest dry weight of grasses, sedges,
Effect on Weeds
broadleaved and total weeds under weedy situation
Weed density in green gram field i.e. number of
was recorded in the plots of ‘PDM 54’, followed
grasses, sedges, broadleaved and total weeds/m 2
by ‘WBM 04-5’ and ‘WBM 34-1-1’. The highest dry
differed significantly with different cultivars under
weightoftotalweedsandgrasseswasobservedunder
weedy as well as hand weeded plots. Grassy weed
‘PDM 84-139’, which was statistically at par with ‘B
population at 45 DAS was significantly minimum
1’ under weedy situation. No significant difference
in the plots of ‘PDM 54 ’ under weedy as well as
was observed at 45 DAS in respect to dry weight of
with hand weeding, which was followed by ‘WBM
grasses, sedges, broadleaved and total weeds among
04-5’ (Table 1). It clearly indicated the grassy weed
different cultivars when hand weeding was applied
suppressing ability of these cultivars. The cultivar
at 30 DAS.
‘PDM 84-139’ under weedy situation registered
Table 1. Weed density and weed dry weight at 45 DAS as influenced by different treatments (Pooled data)
Weed density (No./m 2 )
Weed dry weight (g/m 2 )
Treatments
Grass
Sedge
BLW
Total
Grass
Sedge
BLW
Total
B 1 - weedy
75.34
23.47
86.67
185.48
122.28
7.62
41.33
171.23
B 105 - weedy
76.80
32.00
77.60
186.40
131.74
10.35
75.15
217.23
PDM 84-139 - weedy
85.74
23.47
77.34
186.55
186.26
5.14
46.82
238.22
WBM 34-1-1 - weedy
64.40
24.00
68.54
156.94
82.47
4.77
24.95
112.19
PDM 54 - weedy
60.40
13.47
53.87
127.74
58.90
3.40
11.64
73.94
WBM 04-5 - weedy
74.80
14.40
61.60
150.80
82.47
6.41
22.17
111.05
B 1 - HW
12.80
5.60
11.47
29.87
3.52
1.35
2.04
6.91
B 105 - HW
9.20
5.60
9.87
24.67
1.57
1.32
1.35
4.24
PDM 84-139 - HW
10.80
4.27
9.60
24.67
3.45
1.29
2.15
6.88
WBM 34-1-1 - HW
9.07
6.14
10.67
25.88
2.27
1.24
3.08
6.59
PDM 54 - HW
10.40
5.60
9.60
25.60
4.07
1.27
1.69
7.02
WBM 04-5 - HW
8.94
2.40
8.27
19.61
3.38
1.13
1.65
6.15
LSD (0.05)
5.27
2.46
5.36
8.83
10.51
0.56
3.15
11.95
(BLW) Broadleaved weed, (DAS) Days after sowing, (HW) Hand weeding at 30 DAS
807