additional fertilizer amount的用法和样例：
- The autumn crops should get additional fertilizer during the vegetation stage.
- There was a tendency to increase progressively with growing time.Both two former showed positive correlation and the two latter showed rative correlation with fertilizer amounter.
- Fertilization which was related to fertilization amount and different growth stages improved photosynthetic rate of leaves.
- Effects of Planting Density and Additional Fertilizer on Potato Tuber Yield