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Table 1.4-1. Approximate relative maturity rating and growing degree days available for Pennsylvania corn maturity zones
Table 1.4-1. Approximate relative maturity rating and growing degree days available for Pennsylvania corn maturity zones.
| Maturity zone¹ |
Approximate relative maturity rating |
Growing degree days |
Planting dates |
| ¹ See map, Figure 1.4-1. |
| 1 |
90–95 |
1,600–1,824 |
May 15–25 |
| 96–100 |
1,825–2,024 |
| 2 |
101–105 |
2,025–2,350 |
May 1–15 |
| 106–110 |
2,350–2,499 |
| 3 |
111–115 |
2,500–2,724 |
April 25–May 7 |
| >115 |
2,725–2,949 |
| 4 |
>115 |
2,950–3,174 |
April 15–May 1 |
| >115 |
3,175 or > |
