Week 
Measurements 
Treatments 
N chambers 
0 
Odor concentration in headspace air 
U and SDSMSH†

6 
 Concentration of VOC's‡ in headspace air 


 Concentration of NH_{3} and H_{2}S in headspace air 


 Thickness of the straw cover 


 Physicochemical characteristics of the slurry 


2, 4, 6, 8 
Concentration of NH_{3} and H_{2}S 
U, SD, SM, SH and SD_{new} §

15 
9 
Odor concentration in headspace air 
U, SD, SM, SH and SD_{new}

15 
 Concentration of VOC's in headspace air 


 Concentration of NH_{3} and H_{2}S in headspace air 


 Thickness of the straw cover 



Physicochemical characteristics of the slurry 


^{†}
Measurements were taken in slurry added straw dry (SD) treatment and assumed to be similar for slurry added straw and moderate moisture content (SM) and slurry added straw and high moisture content (SH) treatments
^{‡}
VOC, volatile organic compounds.
^{§}
Chambers corresponding to SD_{new} at Weeks 2, 4, 6, and 8 did not contain new straw, as the removal of the aged straw cover and the addition of new straw, in SD_{new} treatment was performed at Week 9.

Start of experiment 
End of experiment 

U_{Week 0}

SDSMSH_{Week 0}

U_{Week 9}

SD_{Week 9}

SM_{Week 9}

SH_{Week 9}

SD_{new}

Thickness, cm 
0a 
10b 
0au 
8.9bcv 
7.2c 
10.1b 
9.3v 
pH 
7.10a 
7.08a 
8.10bu 
7.67cv 
7.52d 
7.43e 
7.69v 
T, °C 
16.0a 
15.8a 
14.0bu 
13.7bu 
13.5b 
14.2b 
14.7u 
Dry matter, g kg^{−1}

40a 
42a 
35bu 
42bu 
38b 
31b 
43u 
Volatile solids, g kg^{−1}

27a 
31a 
23bu 
30bu 
26b 
22b 
30u 
Total N, g L^{−1}

5.2a 
4.4ab 
4.4abu 
4.4abu 
3.8b 
3.5b 
4.5u 
Ammonium N, g L^{−1}

3.0a 
3.0a 
2.7bu 
2.6bu 
2.1b 
2.8b 
2.2u 
Acetic acid, g m^{−3}

5878a 
4601a 
196bu 
532bu 
635b 
429b 
453u 
Propanoic acid, g m^{−3}

2957a 
2738a 
375bu 
2893av 
2213ac 
1898c 
2169v 
2Methyl propanoic acid, g m^{−3}

499a 
497a 
199bu 
377bu 
304b 
286b 
310u 
3Methyl butanoic acid, g m^{−3}

701a 
699a 
341bu 
549bu 
440b 
326b 
492u 
Pentanoic acid, g m^{−3}

136a 
134a 
8bu 
10bu 
10b 
14b 
8u 
^{†}
Values are arithmetic means from three repetitions per treatment.
^{‡}
Same letters (a, b, c, d) within rows indicate no significant differences (P > 0.05) between U_{Week 0}, SDSMSH_{Week 0}, U_{Week 9}, SD_{Week 9}, SM_{Week 9}, and SH_{Week 9} Same letters (u, v, w) within rows indicate no significant differences (P > 0.05) between U_{Week 9}, SD_{Week 9}, and SD_{new}

Start of experiment 
End of experiment 

U _{Week 0}

SDSMSH_{Week 0}

U_{Week 9}

SD_{Week 9}

SM_{Week 9}

SH_{Week 9}

SD_{new}

Odor concentration (OC), OU m^{−3}

760 (7)a 
1027 (6)a 
1173 (8)au 
819 (4)au 
1144 (15)a 
1400 (13)a 
605 (4)u 
NH_{3}, mg m^{−3}

55 (4)a 
155 (3)a 
118 (18)bu 
2.4 (0)cv 
1.4 (1)c 
1.8 (1)c 
63 (5)w 
H_{2}S, mg m^{−3}

0 ()a 
0 ()a 
0.30 (0.21)bu 
0.17 (0.21)bu 
0.36 (0.18)b 
0.37 (0.17)b 
0.29 (16)u 
1Butanol, μg m^{−3}

77 (47)a 
506 (17)a 
3.4 (0.8)bu 
5.7 (0.1)bu 
6.6 (0.1)b 
6.7 (0.2)b 
5.8 (18)u 
Trimethylamine, μg m^{−3}

81 (20)a 
657 (3)b 
0.0 ()cu 
0.0 (173)cu 
0.0 ()c 
1.0 (165)c 
0.2 (173)u 
Acetic acid, μg m^{−3}

64 (25)a 
142 (4)a 
1370 (7)bu 
1269 (7)bu 
1183 (9)b 
901 (11)b 
1393 (9)u 
Propionic acid, μg m^{−3}

66 (12)a 
55 (5)a 
13 (7)bu 
7.3 (16)bu 
12 (1)b 
9.5 (7)b 
12 (58)u 
2Methyl propanoic acid, μg m^{−3}

9.0 (21)a 
12 (24)a 
0.5 (173)bu 
0.4 (173)bu 
1.3 (30)b 
0.0 ()b 
1.9 (173)u 
Butanoic acid, μg m^{−3}

3.1 (97)a 
1.8 (76)a 
1.3 (50)au 
0.2 (87)au 
2.1 (96)a 
0.2 (92)a 
1.8 (56)u 
3Methyl butanoic acid, μg m^{−3}

9.0 (2)ab 
29.5 (2)b 
5.9 (31)au 
7.1 (9)abu 
13 (37)ab 
7.1 (6)a 
19 (10)u 
Pentanoic acid, μg m^{−3}

0.4 (87)a 
0.1 (173)a 
0 ()bu 
0 ()bu 
0 ()b 
0 ()b 
0 ()u 
Dimethyl sulfide, μg m^{−3}

6.2 (32)ab 
2.1 (30)a 
28 (6)cu 
4.7 (38)abv 
3.0 (13)ab 
8.4 (17)b 
32 (5)u 
Dimethyl disulfide, μg m^{−3}

9.4 (51)a 
2.4 (137)a 
16 (7)au 
4.7 (11)au 
4.1 (19)a 
5.6 (35)a 
6.9 (4)u 
Carbon disulfide, μg m^{−3}

0.1 (90)a 
0.0 (173)a 
96 (18)bu 
21 (7)bv 
25 (27)b 
42 (17)b 
28 (3)uv 
Phenol, μg m^{−3}

1.0 (73)a 
0.8 (32)a 
6.3 (18)bu 
1.3 (42)av 
1.1 (53)a 
1.0 (87)a 
1.8 (70)v 
pcresol, μg m^{−3}

1.1 (115)ab 
0.2 (165)a 
205 (15)cu 
11 (45)abv 
13 (21)ab 
9.8 (77)ab 
93 (19)u 
Indole, μg m^{−3}

1.6 (87)a 
1.7 (28)a 
0.4 (68)bu 
0.7 (89)bu 
0.7 (51)b 
0.8 (98)b 
0.7 (19)u 
Skatole, μg m^{−3}

18 (43)a 
0.3 (152)b 
15 (39)au 
0 (100)bv 
0.6 (139)b 
0.3 (149)b 
2.9 (33)v 
Benzyl alcohol, μg m^{−3}

0.0 (90)a 
0.1 (73)a 
189 (16)bu 
2.5 (106)acv 
3.4 (58)ac 
12 (22)c 
52 (29)u 
Benzaldehyde, μg m^{−3}

12 (20)a 
1.8 (90)a 
1.7 (15)bu 
0.8 (60)bu 
1.2 (39)b 
1.0 (51)b 
0.9 (19)u 
^{†}
Values are geometric means (calculated by back transformations of log_{e} arithmetic means) and values in parenthesis are coefficients of variation on log_{e} basis (calculated as the ratio of the standard deviation to the arithmetic mean of log_{e} statistics).
^{‡}
The GLM analysis was carried out on log_{e} basis. Same letters (a, b, c, d) within rows indicate no significant differences (P > 0.05) between U_{Week 0}, SDSMSH_{Week 0}, U_{Week 9}, SD_{Week 9}, SM_{Week 9}, and SH_{Week 9} Same letters (u, v, w) within rows indicate no significant differences (P > 0.05) between U_{Week 9}, SD_{Week 9}, and SD_{new}