Intercropping and Nitrogen Fertilization Altered the Patterns of Leaf Senescence in Sorghum
Table 5
Maximum leaf greenness (SPADmax), minimum leaf greenness (SPADmin), time to loss of 50% SPADmax (EC50), and the rate of leaf senescence (RS) means of two sorghum varieties (Gadam and Serena) grown in sole and intercrop system with two varieties of cowpea (K80 and M66) and N rate at the KALRO research stations in Igoji and Katumani during 2018/2019 short rains season.
Treatments
Igoji
Katumani
SPADmax (SPAD units)
SPADmin (SPAD units)
EC50 (days)
RS (SPAD units day−1)
SPADmax (SPAD units)
SPADmin (SPAD units)
EC50 (days)
RS (SPAD units day−1)
Cropping systems (CS)
Sole Gadam
49.73a
10.08a
31.43a
6.39a
61.48ab
15.41a
23.95a
8.53a
Gadam + K80
40.77b
14.38a
29.49a
5.16a
64.18a
17.17a
22.72a
4.41b
Gadam + M66
42.30b
14.79a
27.08a
4.17a
55.90ab
15.40a
25.15a
4.55b
Sole Serena
42.70b
13.33a
31.38a
5.25a
57.04ab
16.32a
24.27a
4.96b
Serena + K80
42.36b
15.08a
30.14a
3.71a
51.60b
16.11a
22.82a
4.84b
Serena + M66
41.03b
12.73a
22.55a
4.04a
51.49b
16.93a
28.12a
5.03b
value
0.047
0.311
0.669
0.683
0.0148
0.992
0.347
0.006
N rates
0 kg·N·ha−1
41.52b
12.95a
26.21b
3.10b
49.17b
14.26a
17.62b
4.83a
40 kg·N·ha−1
41.25b
12.23a
26.03b
5.51a
62.35a
16.16a
26.64a
5.19a
80 kg·N·ha−1
46.67a
15.01a
33.80a
5.74a
59.33a
18.25a
29.25a
6.14a
value
<.001
0.408
0.023
0.044
0.004
0.132
<.001
0.49
value CS × N
0.003
0.606
0.332
0.127
0.043
0.094
0.252
0.142
The means within a column followed by the same alphabets are statistically similar, CS: cropping system, CS × N: interaction between cropping system and N rate, ns: not significant.
