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)