Table 8.
Potassium remobilization efficiency (%) and contribution to grain K (%) in maize as influenced by year, cultivar, and levels of NPK.
| Treatments | K remobilization efficiency | Contribution to grain K by K remobilization | ||
|---|---|---|---|---|
| Leaf | Stalk | Leaf | Stalk | |
| Year | ||||
| Year 1 | +11.8a | +48.4a | 12.2a | 151.7a |
| Year 2 | +9.1a | +47.2a | 11.9a | 184.0a |
| Cultivar | ||||
| P3522 | +18.2a | +49.7a | 17.8a | 170.2a |
| P3396 | −9.8b | +50.3a | –5.4b | 177.0a |
| Rajkumar | +23.0a | +43.4b | 23.9a | 156.3b |
| Levels of NPK | ||||
| N100P30K30 (50% RDF) | +3.8a | +36.3a | 5.0a | 102.4d |
| N150P45K45 (75% RDF) | +0.9a | +47.2a | 0.8a | 149.7cd |
| N200P60K60 (100% RDF) | +3.9a | +47.7a | 5.6a | 184.6b |
| N250P75K75 (125% RDF) | +1.3a | +49.9a | 3.8a | 213.6a |
| N300P90K90 (150% RDF) | +9.3a | +49.2a | 12.5a | 173.5b |
| P60K60 (100% RDF–N) | +18.7a | +48.3a | 23.1a | 176.2b |
| N200K60 (100% RDF–P) | +21.9a | +50.5a | 21.5a | 161.9bc |
| N200P60 (100% RDF–K) | +19.2a | +51.4a | 19.9a | 168.2bc |
| Control (–NPK) | +15.1a | +49.6a | 16.6a | 180.6b |
| Source of variation | ||||
| Year | ns | ns | ns | ns |
| Cultivar | * | * | * | * |
| Levels of NPK | ns | ns | ns | * |
| Year × cultivar | ns | ns | ns | ns |
| Year × levels of NPK | ns | ns | ns | ns |
| Cultivar × levels of NPK | ns | ns | ns | * |
| Year × cultivar × levels of NPK | ns | ns | ns | ns |
Year 1 and year 2 represent winter 2012–13 and 2013–14, respectively. Within year, cultivar, and levels of NPK, numbers followed by different letters indicate significant differences at p ≤ 0.05 (otherwise statistically at par). ns, non-significant (p > 0.05). *Significant at p ≤ 0.05, + and − sign represent the situations when the tissue is acting as a source and sink, respectively.