Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Date of 50% bloom - Method'?

A. Record the date when 50% of the plants reach 50% stigma emergence of their first panicle
B. The producer observes the different plots and assigns a preference score using a pre-defined scale
C. Observation of the presence or absence of bristel on the main panicle on few number of plant per plot
D. Record the date of onset of black spot formation at the base of the grain on a sample of panicles. The recommended sample size is 10 panicles

Answer: Record the date when 50% of the plants reach 50% stigma emergence of their first panicle