1- Is GDD constant for same crop in different latitudes?
2-Is there same To,Tc,Tmin and....(Cardinal temperatures) for same crops (such as a variety of Weat) in different geographical latitudes or is different?
1. if Same crop sown at different location like wheat have same GDD but change as per variety/cultivars as per characteristics of early, timely and late sowing.
2. The GDD change due to influence of day temperature (maximum temperature) and nocturnal or night temperature (minimum temperature),
3. At different latitude have different GDD values for maturity of crop and attained different phenophase.
4. if same latitude have same GDD theoretic value but actually its change due to change climate type, agro climatic region which influence the base temperature crop.