TOS1 was sown on May 4 and TOS 2 was sown on 26 May.
These photos were taken on 31 July and show the differences in 2 varieties between the two sowing times.
While only 21 days difference, the variance in growth is large. The maturity groups are as follow:
Timok: Mid
Morava: Late
Popany: Very late
When each variety reaches flowering hay cuts will be taken from each variety to determine total biomass from the different times of sowing.