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AUTHOR: Avia Saloner and Nirit Bernstein *
Institute of Soil Water and Environmental Sciences, Volcani Center, Rishon LeZion 7505101, Israel
VIDEO SUMMARY
Journal Breakdown: Dynamic Behavior of Mineral Uptake in Cannabis
Summary
This study explores how nutrient uptake changes in cannabis plants during their vegetative and reproductive phases, focusing on three cultivars grown to flower maturity. Using stable nutrient recipes throughout the growth cycle, researchers measured biomass, tissue mineral concentrations, mineral deposition rates, and translocation factors. The findings highlight significant shifts in nutrient demands, offering actionable insights for cultivators aiming to optimize plant nutrition and reduce costs.
Key Findings
Increased Nutrient Uptake in the Reproductive Phase:
Nitrogen (N), phosphorus (P), and potassium (K) concentrations in plant shoots were 2.33, 4.90, and 3.32 times higher, respectively, by the end of the reproductive phase compared to the vegetative phase.
P and K uptake steadily increased throughout the reproductive phase, while N uptake remained relatively stable.
Calcium (Ca) Uptake Decline Despite Transpiration Stability:
A notable decrease in Ca uptake occurred during the reproductive phase across all cultivars.
Despite stable or increased transpiration rates in two cultivars, Ca uptake declined, indicating a potential selective nutrient uptake mechanism.
Optimizing Nutrient Timing:
The data suggest that plants prioritize certain nutrients during different growth phases, allowing cultivators to adjust nutrient inputs accordingly.
Application for Cultivators
1. Adjust Nutrient Feeding Schedules:
Vegetative Phase: Focus on balanced nutrient availability to support root and shoot development.
Reproductive Phase: Increase phosphorus and potassium inputs to meet the plant’s higher demand for these nutrients.
2. Monitor Calcium Needs Carefully:
Even if transpiration rates are stable, consider monitoring tissue Ca levels and adjusting feeding protocols to ensure sufficient supply during this critical phase.
3. Optimize Costs Through Precision Feeding:
Tailor nutrient recipes to the dynamic needs of your plants, avoiding over- or under-fertilization. This reduces waste, cuts costs, and improves overall efficiency.
4. Use Data to Enhance Plant Health and Yield:
Implement tissue sampling and mineral analysis during both growth phases to fine-tune nutrient applications for specific cultivars.
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