Table 2. Effect of the different K application rates on the yield, K concentration and total phenol content of soybean plants in two field trials over two years.
| Year | K treatment | Zhangjiachi | Changling | ||||
|---|---|---|---|---|---|---|---|
| Yield (kg ha-1) |
K (%) |
Phenols (mg g-1) |
Yield (kg ha-1) |
K (%) |
Phenols (mg g-1) |
||
| K0 | 1338±105b | 0.80±0.04b | 1.12±0.05b | 1505±64b | 0.94±0.02c | 0.94±0.11b | |
| 2012 | K60 | 1671±94a | 1.01±0.08a | 1.53±0.12a | 2015±135a | 1.28±0.08b | 1.33±0.10a |
| K120 | 1664±93a | 1.14±0.06a | 1.72±0.16a | 1929±122a | 1.59±0.07a | 1.42±0.09a | |
| K0 | 1534±88b | 0.84±0.07c | 1.10±0.08b | 1409±58b | 0.97±0.08c | 1.02±0.13c | |
| 2013 | K60 | 1990±98a | 1.13±0.01b | 1.83±0.08a | 1853±65a | 1.30±0.05b | 1.32±0.06b |
| K120 | 1867±87a | 1.27±0.07a | 1.98±0.08a | 1916±132a | 1.67±0.07a | 1.60±0.13a | |
Note: K0, no K application; K60, 60 kg ha-1 K; K120, 120 kg ha-1 K. All of the data are the means ± SE (n = 4). The different letters after the numbers in the same column for the same trait in the same year indicate significant differences (P<0.05) by Duncan’s t-tests.