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Physiology Pgr’s Nitrogen on Crop Growth Rate, Indole Acetic Acid Oxidase Activity Black Gram
17
presented in Table 4. The unoxidised auxin content
was significantly increased by the foliar application of
nutrients and growth regulators. Application of N 25
kg/ha + urea 2% + 0.1 ppm BR (T
7
) proved to be
superior (65.8, 98.5, 105.6 and 74.8 µg of unoxidised
auxin
·
g
-1
·
hr
-1
) in its activity compared to all other
treatments. It is also known that all the treatments
were significantly superior over the control (88.1,
121.4, 147.2 and 116.0 µg of unoxidised auxin
·
g
-1
·
hr
-1
)
at all the stages of growth.
Table 2 Effect of nitrogen nutrition and growth regulators on net assimilation rate (mg·m
-2
·day
-1
) in black gram at different growth
stages
Treatment
30~45 DAS
45~60 DAS
60~75 DAS
T
1
0.54
0.50
0.48
T
2
0.60
0.58
0.57
T
3
0.65
0.64
0.61
T
4
0.64
0.60
0.59
T
5
0.59
0.57
0.55
T
6
0.57
0.54
0.52
T
7
0.66
0.65
0.63
T
8
0.62
0.59
0.56
T
9
0.56
0.52
0.50
Mean
0.61
0.58
0.56
SEd
0.026
0.025
0.024
CD (P=0.05)
0.055
0.054
0.052
Note: T
1
: Control; T
2
: N 25 kg/ha + Urea 2% + NAA 40 ppm; T
3
: N 50 kg/ha + CCC 200 ppm; T
4
: N 25 kg/ha + Urea 2% + CCC 200
ppm; T
5
: N 25 kg/ha + Urea 2% + Humic acid 0.1%; T
6
: N 25 k/ha + Urea 2% + Salicylic acid 100 ppm; T
7
: N 25 kg/ha + Urea
2% + Brassinosteriod 0.1 ppm; T
8
: N 25 kg/ha + Urea 2% + ZnSO4 0.5% + FeSO4 0.5% + Borax 0.2%; T
9
: N 25 kg/ha +
Water spray
Table 3 Effect of nitrogen nutrition and growth regulators on NRase activity (µg NO
2
·g
-1
·hr
-1
) in black gram at different growth stages
Treatments
30 DAS
45 DAS
60 DAS
Harvest stage
T
1
14.4
19.4
28.1
9.8
T
2
16.2
22.8
41.7
11.9
T
3
18.3
28.6
49.8
10.6
T
4
19.9
34.6
52.8
17.3
T
5
16.7
22.9
42.8
10.7
T
6
17.6
26.4
46.5
10.8
T
7
21.2
36.3
56.2
18.3
T
8
15.8
22.4
38.4
15.4
T
9
15.1
21.0
30.4
11.6
Mean
17.21
26.09
43.58
12.91
SEd
0.72
1.10
1.82
0.54
CD (0.05)
1.54
2.34
3.87
1.15
Note: T
1
: Control; T
2
: N 25 kg/ha + Urea 2% + NAA 40 ppm; T
3
: N 50 kg/ha + CCC 200 ppm; T
4
: N 25 kg/ha + Urea 2% + CCC 200
ppm; T
5
: N 25 kg/ha + Urea 2% + Humic acid 0.1%; T
6
: N 25 k/ha + Urea 2% + Salicylic acid 100 ppm; T
7
: N 25 kg/ha + Urea
2% + Brassinosteriod 0.1 ppm; T
8
: N 25 kg/ha + Urea 2% + ZnSO4 0.5% + FeSO4 0.5% + Borax 0.2%; T
9
: N 25 kg/ha +
Water spray