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

Which of the following definitions best describes 'Stem biomass at R9 method'?

A. Standard protocol of biomass sampling, compute stem biomass at R9 in kg/ha using the biomass component (dried to constant weight at 60C) from sampled area (0.5 m of a row).
B. Compute as air temperature minus canopy temperature measured using an infrared thermometer.
C. Compute pod wall biomass proportion = pod wall biomass DW at harvest / pod biomass DW at harvest x 100
D. Standard protocol of biomass sampling, compute pod wall biomass at R9 in kg/ha using the biomass component (dried to constant weight at 60C) from sampled area (0.5 m of a row).

Answer: Standard protocol of biomass sampling, compute stem biomass at R9 in kg/ha using the biomass component (dried to constant weight at 60C) from sampled area (0.5 m of a row).