Update 2 files

- /assays/plant_phenotyping/protocols/score_flowering.txt
- /assays/plant_phenotyping/protocols/score_flowering.md

assays/plant_phenotyping/protocols/score_flowering.md

+## Score flowering
+
+- score in DAE (days after emergence) as the period between plant emergence from soil and reaching awn emergence on the main culm (Zadoks stage 49, Zadoks et al. (1974))
+
+
+**References:**
+
+Zadoks JC, Chang TT, Konzak CF. A decimal code for the growth stages of cereals. Weed Res. 1974:14(6):415–421. https://doi.org/10.1111/j.1365-3180.1974.tb01084.x
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