Table 4: Summary of nitrous oxide flux means among fertilizer-nitrogen (N) [i.e., optimum plus one split (OPOS), half optimum plus two splits (HOPTS), optimum plus two splits (OPTS), and unamended control (UC)] and days after planting (DAP) treatment combinations from rice grown in a silt-loam soil under furrow-irrigation in the greenhouse.
DAP |
Fertilizer-N treatments |
|||
OPOS |
HOPTS |
OPTS |
UC |
|
|
_______________________ mg m-2 hr-1 ______________________ |
|||
22 |
0.53a-h†* |
0.24c-h* |
1.26a-d* |
0.09hi |
29 |
0.61a-h* |
0.61a-h* |
0.78a-f* |
0.18d-i |
36 |
1.66a-c* |
0.33a-h* |
2.11ab* |
0.19d-i |
43 |
0.50a-h* |
0.59a-h* |
0.55a-h* |
0.22c-i |
50 |
0.42a-h* |
0.23c-i |
1.35a-d* |
0.33a-h* |
57 |
0.18d-i |
0.94a-e* |
0.54a-h* |
0.51a-h* |
63 |
2.33a* |
1.90ab* |
0.67a-g* |
0.28b-h* |
69 |
0.73a-g* |
2.15ab* |
0.13e-i |
0.03i |
78 |
1.06a-d* |
0.78a-f* |
1.20a-d* |
0.38a-h* |
85 |
0.62a-h* |
0.31a-h* |
0.03i |
0.39a-h* |
92 |
0.38a-h* |
0.25c-h* |
0.22c-i |
1.48a-c* |
99 |
0.29b-h* |
0.34a-h* |
< 0.01j |
0.54a-h* |
106 |
0.10f-i |
0.42a-h* |
0.13e-i |
< 0.01j |
113 |
0.48a-h* |
0.24c-h* |
0.19d-i |
0.74a-g* |
120 |
< 0.01j |
0.10g-i |
< 0.01j |
1.35a-d* |
*An asterisk denotes a mean nitrous oxide flux that differed from zero (P < 0.05)
†Means followed by a letter with the same case do not differ (P > 0.05)