Is it the total weight of the plant? Inc all, root, shoot, grain (whole plant) ?
Yes, Biological yield refers to the overall weight of plant including all its parts.
Biological yield is usually defined as total above ground plant yield. Roots are not included.
Reference:
Soleimani, B., Khosh-Khui, M., Ramezani, S., 2011. Planting date effects on growth, seed yield, essential oil content and chemical composition of Ajowan. Journal of Applied Biological Sciences, 7-11.
The Biological Yield (BY) is the total amount of dry matter accumulation in a plant.It accounts for the totality of the plant , including the roots.The greater amount of dry matter accumulated results in a greater biological yield which in-turn is directly related to a greater amount of food produced.Normally, the dry matter of a crop is directly affected by the Net Photosynthesis (The difference between Total photosynthesis and Total respiration) is directly related to the dry matter content of a crop.The greater the difference between total photosynthesis and total respiration; the greater will be the amount of dry matter accumulated in the crop.
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