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Pages from diapo_5.pdf
1. From uptake to yield (QUEFTS – step 3)
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Maximum dilution / accumulation curves: convert (N, P, K) uptake to yield
Physiological nutrient use efficiency:
Root
yield
(t
DM
ha
-1
)
N uptake (kg N ha-1) P uptake (kg P ha-1) K uptake (kg K ha-1)
𝑃ℎ𝐸𝛽𝑚𝑎𝑥,𝑁
𝑃ℎ𝐸𝛽𝑚𝑖𝑛,𝑁
𝑃ℎ𝐸𝛽𝑚𝑎𝑥,𝑃 𝑃ℎ𝐸𝛽𝑚𝑖𝑛,𝑃
𝑃ℎ𝐸𝛽𝑚𝑎𝑥,𝐾
𝑃ℎ𝐸𝛽𝑚𝑖𝑛,𝐾
𝑃ℎ𝐸𝛽
Example: P-deficiency and ample (N, K) supply: maximal dilution of P, and maximal accumulation of (N, K)