Table 1. Initial chemical characteristics of the soil during the three cropping seasons.
| Cropping Seasons | Treatments | Total N (g kg-1) | Available N (mg kg-1) | Available P (mg kg-1) | Available K (mg kg-1) | Organic matter (%) | pH |
|---|---|---|---|---|---|---|---|
| 2012/2013 | N0 | 0.91a | 73.43c | 22.07a | 157.07a | 16.98a | 8.31a |
| N180 | 0.95a | 85.23b | 23.60a | 163.77a | 17.12a | 8.29a | |
| N240 | 1.04a | 84.45b | 24.18a | 166.69a | 17.55a | 8.24a | |
| N300 | 0.97a | 93.96a | 24.23a | 163.74a | 17.85a | 8.19a | |
| mean | 0.97 | 84.27 | 23.52 | 162.82 | 17.37 | 8.26 | |
| 2013/2014 | N0 | 0.89a | 70.28c | 17.90a | 102.69a | 16.10a | 8.28a |
| N180 | 0.99a | 89.64ab | 17.64a | 103.10a | 16.21a | 8.19a | |
| N240 | 1.03a | 85.29b | 17.95a | 112.30a | 16.35a | 8.20a | |
| N300 | 0.95a | 90.36a | 17.41a | 112.81a | 16.60a | 8.23a | |
| mean | 0.97 | 83.89 | 17.73 | 107.73 | 16.32 | 8.23 | |
| 2014/2015 | N0 | 0.89a | 72.59c | 13.09a | 116.77b | 15.08a | 8.32a |
| N180 | 0.90a | 79.28b | 12.25a | 120.25b | 16.67a | 8.20a | |
| N240 | 1.01a | 84.54a | 11.92a | 146.97a | 16.82a | 8.26a | |
| N300 | 0.85a | 89.56a | 13.10a | 158.36a | 16.01a | 8.21a | |
| mean | 0.92 | 81.49 | 12.59 | 135.59 | 16.15 | 8.25 |
Note: Data represent the average value; values with different letters in the same column indicate a significant difference at the 5% level.