Table 3: Summary of the combined effects of biochar source [i.e., Arkansas (AR) and Colorado (CO)] and rate on water-soluble (WS) calcium (Ca), magnesium (Mg), and iron (Fe) over the 2023 growing season under simulated-furrow-irrigated rice on a silt-loam soil in the greenhouse.
|
Biochar Source |
Rate (Mg ha-1) |
WS-Ca (mg kg-1) |
WS-Mg (mg kg-1) |
WS-Fe (mg kg-1) |
|
AR |
0 |
23.6 a† |
3.2 a |
3.7 b |
|
2.5 |
20.6 ab |
2.5 ab |
3.8 b |
|
|
5 |
22.2 ab |
2.6 ab |
3.8 b |
|
|
CO |
0 |
23.0 a |
3.0 ab |
4.0 ab |
|
2.5 |
23.2 a |
2.9 ab |
3.7 b |
|
|
5 |
18.9 b |
2.1 b |
4.8 a |
†Means in a column with different letters are different at P < 0.05