Table 6.
Phosphorus remobilization efficiency (%) and contribution to grain P (%) in maize as influenced by year, cultivar, and levels of NPK.
| Treatments | P remobilization efficiency | Contribution to grain P by P remobilization | ||
|---|---|---|---|---|
| Leaf | Stalk | Leaf | Stalk | |
| Year | ||||
| Year 1 | +26.4a | +35.6a | 7.7a | 20.2a |
| Year 2 | +27.7a | +38.8a | 8.2a | 25.0a |
| Cultivar | ||||
| P3522 | +41.0a | +56.6a | 10.6a | 30.0a |
| P3396 | −1.9b | +18.5c | 0.9b | 12.9b |
| Rajkumar | +42.0a | +36.6b | 12.4a | 24.9a |
| Levels of NPK | ||||
| N100P30K30 (50% RDF) | +8.0c | +44.7abc | 4.9cd | 27.0bc |
| N150P45K45 (75% RDF) | +14.6c | +38.1bc | 4.1d | 22.2bc |
| N200P60K60 (100% RDF) | +21.3bc | +30.0c | 6.1bcd | 16.1c |
| N250P75K75 (125% RDF) | +9.5c | −13.6d | 4.0d | –4.8d |
| N300P90K90 (150% RDF) | +28.8bc | +32.8bc | 7.6bcd | 19.8c |
| P60K60 (100% RDF–N) | +36.3bc | +51.7ab | 10.8b | 34.1ab |
| N200K60 (100% RDF–P) | +41.6a | +45.4abc | 10.9b | 24.7bc |
| N200P60 (100% RDF–K) | +39.0a | +43.1bc | 10.2b | 24.3bc |
| Control (–NPK) | +44.2a | +62.8a | 13.3a | 40.0a |
| Source of variation | ||||
| Year | ns | ns | ns | ns |
| Cultivar | ** | ** | ** | * |
| Levels of NPK | ** | ** | ** | ** |
| 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. **Significant at p ≤ 0.01, + and − sign represent the situations when the tissue is acting as a source and sink, respectively.