Previous Crop and Cultivar Effects on Methane Emissions from Drill-Seeded, Delayed-Flood Rice Grown on a Clay Soil
Table 1
Mean soil properties ( for each previous crop) prior to flood establishment from Sharkey clay during the 2013 growing season at the University of Arkansas Northeast Research and Extension Center in Keiser, Arkansas.
Soil property
Previous crop
Rice
Soybean
pH
7.06
7.13
Electrical conductivity (dS m−1)
0.216
0.202
Sand (g g−1)
0.14
0.10
Silt (g g−1)
0.34
0.33
Clay (g g−1)
0.52
0.57
Bulk density (g cm−3)
1.17
1.09
Mehlich-3 extractable nutrients (mg kg−1)
P
55.9
46.3
K
387
390
Ca
4147
4570
Mg
867
919
Fe
467
445
Mn
51.1
53.9
Na
54.5
59.3
S
17.6
12.3
Cu
4.0
4.7
Zn
3.4
3.5
Organic matter (g kg−1)
37.7
39.6
Organic matter (Mg ha−1)
44.0
43.1
Total N (g kg−1)
1.4
1.4
Total N (Mg ha−1)
1.6
1.5
Total C (g kg−1)
15.0
14.8
Total C (Mg ha−1)
17.4
16.1
C : N ratio
10.8
10.5
Values in the same row followed by different letters are significantly different ().
