Table 2.
Potassium uptake, potassium agronomy efficiency (KAE), and potassium recovery efficiency (KRE) of cotton plants after harvesting in 2019.
| Treatment | Potassium uptake | KAE | KRE |
|---|---|---|---|
| (kg ha−1) | (kg kg−1) | (%) | |
| Potassium fertilizer type | |||
| CRK | 247.0 a | 13.0 a | 34.3 a |
| KS | 227.8 b | 11.1 b | 31.9 b |
| FA rate (kg ha−1) | |||
| 90 | 230.7 b | 11.4 b | 32.4 b |
| 180 | 248.2 a | 12.6 a | 34.0 a |
| 270 | 233.3 b | 11.8 b | 32.8 b |
| Potassium fertilizer type × FA rate interaction | |||
| Control | 181.6 d | – | – |
| CRK × FA90 | 238.7 b | 12.5 b | 33.5 b |
| CRK × FA180 | 260.0 a | 13.6 a | 35.3 a |
| CRK × FA270 | 242.6 b | 12.8 b | 34.0 b |
| KS × FA90 | 222.2 c | 10.4 d | 31.3 d |
| KS × FA180 | 236.1 b | 11.6 c | 32.6 c |
| KS × FA270 | 224.5 c | 10.8 d | 31.6 d |
| Source of variance | |||
| Potassium fertilizer type | <0.0001 | <0.0001 | <0.0001 |
| FA rate | <0.0001 | 0.0006 | 0.0002 |
| Potassium fertilizer type × FA rate | 0.1062 | 0.9636 | 0.5871 |
Means followed by different lowercase letters in the same column were significantly different based on analyses by ANOVA followed by Duncan’s test (p < 0.05). Control, no potassium fertilizer; CRK, polymer-coated potassium chloride; and KS, sulfate potassium.