Intercropping and Nitrogen Fertilization Altered the Patterns of Leaf Senescence in Sorghum
Table 4
Number of green leaves at 10, 20, 30, 40, and 50 days after flowering (DAF) of two sorghum varieties (Gadam and Serena) grown in sole and intercrop system with two varieties of cowpea (K80 and M66) and three N rates at the KALRO, Igoji, and Katumani research station during 2018/2019 short rains season.
Treatment
Igoji
Katumani
10
20
30
40
50
10
20
30
40
50
Cropping system (CS)
Sole Gadam
5.8c
6.1b
6.0b
3.6b
2.3c
4.4bc
4.3b
3.4ab
3.0bc
2.1b
Gadam + K80
6.6ab
6.7ab
7.4a
4.4a
3.4a
4.9a
4.4b
3.2b
2.7cd
2.0b
Gadam + M66
6.4ab
6.7ab
7.7a
4.7a
3.7a
5.0a
4.9a
3.8a
3.6a
2.8a
Sole Serena
6.0bc
6.7ab
6.0b
4.3a
2.7bc
4.3c
3.7c
2.9c
2.3d
1.4c
Serena + K80
6.1bc
6.7ab
7.8a
4.6a
2.9b
4.9a
4.8a
3.8a
3.2ab
2.3b
Serena + M66
6.8a
7.2a
6.8ab
4.8a
3.6a
4.8ab
4.4b
3.7a
2.7cd
2.0b
value
<0.001
0.020
0.007
0.010
0.009
0.043
0.019
0.050
0.05
0.031
N rate
0 kg·N·ha−1
3.8b
4.3b
5.5b
2.0b
0.9b
2.9b
2.6b
1.5b
1.0b
0.2b
40 kg·N·ha−1
7.6a
8.0a
7.7a
5.6a
4.1a
5.7a
5.3a
4.4a
3.9a
3.1a
80 kg·N·ha−1
7.4a
7.7a
7.6a
5.6a
4.3a
5.6a
5.4a
4.4a
3.8a
3.1a
value
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
value CS × N
0.046
0.021
0.329
0.046
0.001
0.034
0.042
0.363
0.024
0.031
The means within a column followed by the same alphabets are statistically similar, CS × N: interaction between cropping system and N rate; ns is not significant.
