Nutrition & Root-Zone Chemistry
Nitrogen Assimilation & Remobilization
Nitrogen is incorporated into amino acids, proteins, nucleic acids, chlorophyll-associated systems, and many other compounds. Its forms, uptake, assimilation, and movement within the plant matter more than leaf color alone.
Key concepts
- Plants absorb inorganic nitrogen primarily in nitrate and ammonium forms under many cultivation systems
- Assimilation requires energy and carbon skeletons
- Nitrogen can be remobilized from older tissues under changing supply and developmental demand
- Excess nitrogen can alter growth and tissue characteristics
What to measure or observe
- Record fertilizer nitrogen form and concentration context
- Observe old-versus-new tissue patterns
- Track growth rate and canopy color over time
- Review root-zone EC, pH, irrigation, and environmental demand before changing nitrogen
Common mistakes
- Diagnosing nitrogen status from one leaf
- Assuming darker green always means better nutrition
- Ignoring nitrogen form
- Adding nitrogen without checking overall EC and root function
Visuals this lesson still needs
- Nitrogen uptake/assimilation pathway
- Older-to-younger remobilization concept
- Nitrogen form comparison
- Nitrogen differential panel