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Question 1: (Figure C from handout, also in book

Question 1: (Figure C from handout, also in book. NUE = Yield / Fertilizer Incre. NUE = Yield / Soil Nut. Supply NUE = PE x UE.  Tissue Nutrient Cont. (kg). UE = . Fertilizer increment (kg).  Yield (kg). PE = .  Tissue Nutrient Cont. (kg).

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Question 1: (Figure C from handout, also in book

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  1. Question 1: (Figure C from handout, also in book

  2. NUE = Yield / Fertilizer Incre. NUE = Yield / Soil Nut. Supply NUE = PE x UE  Tissue Nutrient Cont. (kg) UE = Fertilizer increment (kg)  Yield (kg) PE =  Tissue Nutrient Cont. (kg) Question 2: Different views and use of the term “NUE” Two components of NUE • NUE (or agronomic) efficiency: the product of physiological & uptake or assimilation efficiencies (PE & UE) • What matters from the environmental perspective is the overall NUE not just the PE • Tissue conc. alone not enough of the story

  3. Question 2: PE for grain yield

  4. Question 2: PE for total biomass yield

  5. Question 3a

  6. Question 3a cont. (Table 2 from handout on soil nutrient bioavailability)

  7. Question 3b:

  8. Question 3b part (i) – go back to tables from lecture 1 notes

  9. Imax or capacity factor Imax (Cs-Cmin) I(Vo)= Km + (Cs-Cmin) Km=[substrate] at ½ Imax Cmin=the min. conc. needed for uptake Question 4a – see Fig. 8. from handout on short distance transport; Carrier Concept & Michaelis-Menten Kinetics

  10. Question 4a: Plot the data I max Cmin Km = I/2 Imax

  11. Question 4b: plot the double reciprocal plot (remember not to try to calculate 1/Influx for Influx=O) Y = 0.004X + 0.0894

  12. 4c: a more efficient plant will shift the curve to the left and make the slope steeper More efficient

  13. 4c. More efficient… More efficient

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