Zadok scale 77 is not a 77% of growth stage. The Zadok scale is the full plant life cycle.
You are comparing a lab trial in controlled conditions with an onsite trial in one of the coldest places in Australia?????
Mininera is south of Arrarat......its cold down there so I'm not surprised at the 130-150 days to 50% heads.
The soil GPP used was from Ouyen.
I have been to both Ouyen and Arrarat and they are complete opposites as far as soil fertility are concerned.
The N content of Ouyen soils [ farmtrials.com.au ]
0-5cm .06%
5-15 cm .06%
The N for Inverleigh [ between Arrarat and Geelong ]
0-5cm .19%
5-15cm .16%
So about 3 times the N in your trial site, but its not only N that is deficient, almost deficient on every other level in particular organic carbon....6.6 times higher 0-5cm in Arrarat.
I would venture that the reason for the 0.8 heads in the control is because the soil in Ouyen is very poor, and probably the very reason soil from that area was used for the trial.
79 days under controlled laboratory conditions would see the plant at full growth stage IMO.
You need to compare apples with apples see soil type comparison below.
http://www.farmtrials.com.au/trial/15975
http://www.farmtrials.com.au/trial/16829
DB
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