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Maximizing Nutrient Use Efficiency in Agriculture

Explore strategies to enhance agronomic efficiency and overall nutrient use in crops for sustainable farming practices. Learn about factors affecting nutrient uptake and assimilation, and how they impact yield and plant health.

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Maximizing Nutrient Use Efficiency in Agriculture

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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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