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

Which of the following definitions best describes 'Plant mean stage count computation'?

A. Description: Record the total number of seeds per raceme

 Materials:

 Dependent on: Seed number cnt [n], Raceme number cnt [n]

 Protocol:
 1. Select racemes according to your sampling protocol.
 2. Strip the fruit from each raceme and remove the seeds from each fruit.
 3. Count and record the number of seeds in each raceme.
 4. Divide the total number of seeds by the number of racemes sampled
B. Description: The average stage of development for a group of plants or plant canopy

 Materials:

 Dependent on: Plant growth stage est {PGrS Scale]; Stem number cnt [n];

 Protocol:
 1. Sample stems according to your sampling protocol.
 2. Tally the number of stems in that fall into each category.
 3. Over all indices from the lowest growth stage index to the highest index, sum the product of the growth stage index and the number of stems in that growth stage divided by the number of stems.
C. Description: Calculate the total mass of forage harvested per unit area.

 Materials: tape measure; scale;

 Dependent on: Forage fresh mass msr [kg] | Forage dry mass msr [kg]; Plot area msr [m2];

 Protocol:
 1. Record the weight for forage fresh mass or forage dry mass.
 2. Divide the mass by the total area of the harvested plot.
D. Description: Record the ordinal days to flowering (DTF) from January 1st

 Materials:

 Dependent on: January 1st [ISO 8601], Plant flowering date est [ISO 8601]

 Protocol:
 1. Record the integer number of days that have elapsed between the plant flowering date and January 1st on a given year.

Answer: Description: The average stage of development for a group of plants or plant canopy

 Materials:

 Dependent on: Plant growth stage est {PGrS Scale]; Stem number cnt [n];

 Protocol:
 1. Sample stems according to your sampling protocol.
 2. Tally the number of stems in that fall into each category.
 3. Over all indices from the lowest growth stage index to the highest index, sum the product of the growth stage index and the number of stems in that growth stage divided by the number of stems.