- Zinc is one of the 13 essential elements for plant growth, and is considered a micronutrient based on the concentration required for plant growth
- principle form of uptake: ionic form (Zn2+)
- amount required for healthy plant growth: 20 ppm, dry soil matter
- zinc ions primarily move through the soil via diffusion
- excessive zinc in soil can lead to deficient iron (Fe)
- soil conditions related to deficiencies in zinc:
- alkaline (high pH) soil
- sandy leached soil
- leveled soils where subsoils are deficient in zinc are exposed on surface
- soils frequently fertilized with phosphorous (P)
- soil factors that affect zinc uptake by plants:
- available levels in soil
- temperature
- the level of decomposition of organic matter
- soil pH: high pH (basic/alkaline) soil decreases the plant uptake of zinc
- plant factors that affect zinc uptake by plant:
- hybrid or variety of plant
- stage of growth
- interactions with phosphorous
- high phosphorous can interfere with zinc metabolism
- high phosphorous can affect the uptake of zinc through the root
Roles of Zinc in Plant Functions
- involved in enzymatic functions in energy production
Zinc Excess
- Excess zinc can induce an iron deficiency, particularly in plants sensitive to iron