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

Which of the following definitions best describes 'Calculation - Soil moisture tension at wilting point'?

A. Count the number of filled spikelets per panicle. Repeat the measurement on other representative panicles. Take the average number of filled spikelets per panicle.
B. Calculate as the ratio of soil oven-dried weight to soil fresh weight at wilting point.
C. Calculate the average length of the awns on 10 randomly selected spikelets
D. Derive from the soil moisture retention (pF) curve using the soil moisture content at wilting point.

Answer: Derive from the soil moisture retention (pF) curve using the soil moisture content at wilting point.