| 1 | |
| 2 | |
| Language: | English |
| 3 | |
| 4 | Studies on residual effect of phosphorus in multiple cropping sequence |
| Language: | English |
| 5 | Studies with 32P on phosphorus utilization by maize and wheat in sequence |
| 6 | Studies on nitrogen and phosphorus fertility investigation in maize wheat rotation |
| Language: | English |
| 7 | |
| 8 | |
| Language: | English |
| 9 | |
| 10 | |
| Language: | English |
| 11 |