🌿 Coffee Nutrition & Metabolism

Mineral Nutrition of Coffee

Comprehensive guide to coffee mineral nutrition and metabolism — nitrogen forms (NH4+:NO3- ratios), nutrient dynamics across phenophases, NPK fertilization responses, elemental composition of beans, and genotype-specific nutrient uptake.

50:50 Optimal NH₄⁺:NO₃⁻ Ratio [1][4][10]
5 C. canephora Genotypes [9]
3 Phenophases Evaluated [9]
15.6% Mg Daily Intake (Female) [3]
Nutrient Functions Nitrogen Forms (2024)

The Importance of Mineral Nutrition in Coffee

Coffee, a perennial C3 metabolism plant with a biennial phenological cycle, has varying nutritional demands across its developmental phases. Understanding nutrient dynamics is essential for optimizing fertilization, productivity, and sustainability [1][4][9].

Nitrogen (N) is the most important nutrient in coffee, with a direct impact on productivity, quality, and sustainability [1][4]. N uptake by the roots is dominated by ammonium (NH₄⁺) and nitrates (NO₃⁻), along with some organic forms at a lower proportion. From the perspective of mineral fertilizer, the most common N sources are urea, ammonium (AM), ammonium nitrates (AN), and nitrates; an appropriate understanding of the right balance between N forms in coffee nutrition would contribute to more sustainable coffee production [1][4].

Fertilizer recommendations for coffee plants are based on the quantity of nutrients removed in the beans at harvest, the expected yield for the subsequent season, and the nutrients removed by roots and shoot biomass. However, this process involves several variables, including soil, climatic conditions, irrigation, planting density, productivity, phenological phase, and genetic factors related to the genotype [9].

Throughout the phenological cycle, certain nutrients are redistributed among organs. For instance, nitrogen and potassium levels decrease in leaves during the reproductive stage of Conilon coffee, whereas phosphorus concentrations are higher in leaves compared to fruits [9]. In fertigated coffee plantations, micronutrient concentrations are higher during the plant growth stage and anthesis, decrease during fruit formation, and increase again as fruits begin to mature [9].

This comprehensive guide integrates the latest research (2024-2025) on coffee nutrition, covering six key nutrient categories, nitrogen form optimization, phenophase-specific dynamics, and genotype-specific responses.

Key References

  • Ramirez-Builes et al. (2024): Nitrogen forms, water stress [1][4]
  • MDPI Horticulturae (2025): C. canephora phenophases [9]
  • Demir et al. (2025): Element contents, health risk [3]
  • Carr et al. (2020): NH₄⁺:NO₃⁻ ratios, H+-ATPase [10]
  • da Gama et al. (2017): NPK leaf anatomy [5]
  • Martinez et al. (2024): N efficiency under water stress [8]

Essential Nutrients in Coffee Nutrition

Six key nutrient categories with their physiological roles and dynamics

Nitrogen (N)
Forms: NH₄⁺, NO₃⁻
Physiological Roles
  • Most important nutrient for coffee [1][4]
  • Essential for leaf and branch formation [9]
  • Component of chlorophyll, amino acids, proteins
  • Direct impact on photosynthesis, biomass accumulation [1][4]
  • Levels decrease in leaves during reproductive stage [9]
Optimal NH₄⁺:NO₃⁻ Ratio

50:50 25:75

Plants with 50:50 and 25:75 ratios showed better response to water stress, higher photosynthesis, chlorophyll content, and N uptake [1][4][10]

Phosphorus (P)
80 kg P₂O₅/ha applied [9]
Physiological Roles
  • Energy transfer (ATP, NADPH)
  • Nucleic acid component (DNA, RNA)
  • Membrane phospholipids
  • Higher concentrations in leaves compared to fruits [9]
  • Genotypes A1 and Clementino highest P in leaves during fruit development [9]
Potassium (K)
400 kg K₂O/ha applied [9]
Physiological Roles
  • Highest element concentration in coffee beans [3]
  • Facilitates translocation of sugars and organic acids [9]
  • Regulates stomatal closure [9]
  • Influences cell water potential [9]
  • Most required nutrient during fruit development [9]
  • Levels decrease in leaves during reproductive stage [9]
Calcium (Ca)
1.5 t/ha lime applied [9]
Physiological Roles
  • Cell wall structure (pectin cross-linking)
  • Membrane stabilization
  • Signal transduction (calmodulin)
  • Critical for cell division and expansion
  • Genotypes A1 and Clementino highest Ca in leaves during fruit development [9]
Magnesium (Mg)
15.6% daily intake (female) [3]
Physiological Roles
  • Central atom of chlorophyll molecule
  • Enzyme activator (RuBisCO, ATPases)
  • Genotypes A1 and Clementino highest Mg in leaves during fruit development [9]
  • Highest daily element intake percentage for females (15.6% in decaffeinated coffee) [3]
Micronutrients
Annual Application Rates [9]
  • Zinc (Zn): 2.0 kg/ha
  • Boron (B): 1.0 kg/ha
  • Copper (Cu): 2.0 kg/ha
  • Manganese (Mn): 10 kg/ha
Critical for [9]
  • Cell division (B, Zn)
  • Membrane stabilization (B, Zn)
  • Respiratory activities of fruits (Fe, Zn, B)
  • Enzyme cofactors

Peak accumulation: During early grain formation (pinhead phase) [9]

Nitrogen Forms: NH₄⁺:NO₃⁻ Ratio Effects (2024)

Five-year study evaluating different NH₄-N/NO₃-N ratios in coffee under controlled and field conditions [1][4]

Optimal Ratios

50% NH₄-N / 50% NO₃-N

25% NH₄-N / 75% NO₃-N

Key Responses

  • Higher photosynthesis (Ps) [1][4]
  • Higher chlorophyll content
  • Higher N and cation uptake
  • Higher dry biomass accumulation (DW)
  • Higher productivity [1][4]

Water Stress Benefits

Plants with 50:50 and 25:75 ratios showed better resistance capacity to water stress [1][4]

Soil pH Effects

The soil pH was significantly influenced by the N forms: the higher the NO₃⁻-N share, the lower the acidification level [1][4].

Seedling Study (2020)

Conclusion: "The combination of 50% NH4-N/50% NO3-N and 25% NH4-N/75% NO3-N N forms in coffee improves the resistance capacity of the coffee to water stress, improves productivity, reduces the soil acidification level, and improves ion balance and nutrient uptake." [1][4]

Nutrient Dynamics Across Phenophases (2025)

Study of dry matter accumulation and nutrient concentrations in five C. canephora genotypes across three phenophases: flowering, fruit development, and fruit ripening [9]

Flowering

Leaves highest dry matter

Fruit Development

Pinhead phase: Ca, Mg, Fe, Zn, B critical

Potassium most required

Fruit Ripening

Greatest accumulation in fruits

Genotype-Specific Nutrient Concentrations

Genotype Maturation Cycle Highest Nutrients (Leaves, Fruit Development) Lowest Nutrients
A1 Early/Medium P, Ca, Mg, Fe, Cu, Zn -
Clementino Medium P, Ca, Mg, Fe, Cu, Zn -
Verdim TA Early/Medium - P, K, Ca, Mn, Zn, B; lowest dry matter in branches across all phenophases
Pirata Early/Medium Intermediate -
K61 Medium Intermediate -

Dry Matter Distribution

NPK Fertilization and Leaf Anatomy

Study of Coffea arabica cv. Topazio MG-1190 under different NPK levels (40, 70, 100, 130, 160% of standard fertilization) over three consecutive years [5]

Key Findings

  • Different NPK levels caused differences in coffee leaf anatomy [5]
  • Productivity was not affected by different NPK levels [5]
  • Gas exchanges were not affected by NPK levels [5]

Study Design

  • Irrigated coffee system
  • Treatments applied 2011-2014
  • Evaluated August 2014 (gas exchange, leaf anatomy)
  • Productivity evaluated 2013 and 2014
Anatomical changes: The different NPK levels caused significant differences in coffee leaf anatomy, demonstrating that mineral nutrition influences internal leaf structure development even when productivity remains unchanged [5].

Nitrogen Efficiency Under Water Stress (2024)

Hydroponic study evaluating N absorption, translocation, and use efficiency in coffee cultivars under water stress and different N doses [8]

Key Finding

N stress → greater root allocation

In plants previously well-supplied with N, N stress induces greater allocation of dry matter in roots, mitigating the effects of subsequent water deficits on shoot dry matter production [8]

Mundo Novo

Young plants subjected to N stress followed by increasing water stress maintained a high utilization efficiency (UE) [8]

Acauã

Well-supplied with N maintained N utilization efficiency up to -1.6 MPa; when N-starved, drastic reduction in UE at potentials below -0.22 MPa [8]

Mineral Content in Coffee Beans (2025)

ICP-OES analysis of essential and non-essential elements in commercial coffee types from Türkiye [3]

Essential Elements Detected

  • K – Highest concentration in all coffee types [3]
  • Mg – 15.6% daily intake for females (decaffeinated)
  • Ca, P, Na, Zn, Se, Mn, Fe, Cu, Cr, Co, B

Elements NOT Detected

As, Cd, Mo, Sb, Ti – safe levels in all coffee types [3]

Health Risk Assessment

  • HI < 1 Hazard Index below 1 for all samples – low-risk group for 300 mL daily consumption [3]
  • TCR < 1×10⁻⁴ Target carcinogenic risk below threshold for all except Classic (Product 1) [3]
  • Classic (P1) Should be consumed less than 300 mL/day (TCR > 1×10⁻⁴) [3]

Gender-Specific Intake

Female: Highest daily element intake percentage is Mg (15.561% in decaffeinated coffee) [3]

Male: Mg also highest, except for some coffee types [3]

Nutrient Concentration Ranges in Coffee Tissues

Nutrient Plant Tissue / Phase Concentration / Application Genotype Variation
Nitrogen (N) Leaves (vegetative) High demand Decreases during reproduction [9]
Phosphorus (P) Leaves (fruit development) Highest in A1, Clementino Higher in leaves than fruits [9]
Potassium (K) Fruit development 400 kg K₂O/ha applied Most required nutrient [9]
Calcium (Ca) Leaves (fruit development) 1.5 t/ha lime applied Highest in A1, Clementino [9]
Magnesium (Mg) Beans 15.6% daily intake (female) [3] Highest in A1, Clementino [9]
Iron (Fe) Leaves (fruit development) - Highest in A1, Clementino [9]
Zinc (Zn) Leaves (fruit development) 2.0 kg/ha applied Highest in A1, Clementino [9]
Copper (Cu) Leaves (fruit development) 2.0 kg/ha applied Highest in A1, Clementino [9]
Boron (B) Leaves (fruit development) 1.0 kg/ha applied Lowest in Verdim TA [9]
Manganese (Mn) Leaves (fruit development) 10 kg/ha applied Lowest in Verdim TA [9]

Key Publications on Coffee Nutrition

Physiological and Agronomical Response of Coffee to Different Nitrogen Forms with and without Water Stress

Ramirez-Builes V.H., Küsters J., Thiele E., Lopez-Ruiz J.C. (2024). Plants 13(10):1387 [1][4]

5-year study; 50:50 and 25:75 NH₄⁺:NO₃⁻ ratios optimal; higher photosynthesis, chlorophyll, N uptake, biomass, productivity; better water stress resistance; higher NO₃⁻ reduces soil acidification.

View Abstract
Nutrient Concentration in Leaves, Branches, and Reproductive Organs of Coffea canephora Genotypes in Three Phenophases

(2025). Horticulturae 11(8):872 [9]

5 genotypes (A1, Clementino, Pirata, K61, Verdim TA); flowering (leaves highest DM), fruit development (K most required), ripening (fruit highest DM); A1/Clementino highest P,Ca,Mg,Fe,Cu,Zn; Verdim TA lowest P,K,Ca,Mn,Zn,B.

View Abstract
Determination of Element Contents and Health Risk Assessment of Some Commercial Coffees in Türkiye

Demir F., Uygunoz D., Kıpçak A.S., Moroydor Derun E. (2025). JOTAF 22:612-622 [3]

ICP-OES analysis; K highest; Mg 15.6% daily intake (female); As,Cd,Mo,Sb,Ti not detected; HI < 1 (safe); TCR < 1×10⁻⁴ except Classic (P1).

View Abstract
Efficiency of absorption, translocation, and use of nitrogen by water-stressed coffee

Martinez H.E.P., Bohorquez C.A.A., Cecon P.R. (2024). Acta Scientiarum Agronomy [8]

N stress → greater root allocation mitigating water deficit; Mundo Novo maintained UE; Acauã: well-supplied up to -1.6 MPa, N-starved drop below -0.22 MPa.

View Abstract
Coffee seedlings growth under varied NO₃⁻:NH₄⁺ ratio: Consequences for nitrogen metabolism, amino acids profile, and regulation of plasma membrane H⁺-ATPase

Carr N.F., et al. (2020). Plant Physiol Biochem [10]

87.5:12.5 and 50:50 ratios: 6% and 29% higher DM yield; 58% and 94% greater photosynthetic capability; H⁺-ATPase regulation.

View Abstract
Anatomy and physiology of leaf coffee plants in different fertilizing levels

da Gama T.C.P., et al. (2017). Coffee Science 12(1):42-48 [5]

NPK levels (40-160% standard) caused leaf anatomy differences; productivity and gas exchanges not affected.

View Abstract
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References

Peer-reviewed sources and authoritative references cited in this research

[1] Ramirez-Builes, V.H., Küsters, J., Thiele, E., & Lopez-Ruiz, J.C. (2024). Physiological and Agronomical Response of Coffee to Different Nitrogen Forms with and without Water Stress. Plants, 13(10), 1387. doi:10.3390/plants13101387 PMID:38794457
[2] Ashihara, H., Fujimura, T., & Crozier, A. (2019). Coffee Plant Biochemistry. In A. Farah (Ed.), Coffee: Production, Quality and Chemistry (pp. 100-162). Royal Society of Chemistry. RSC Publishing
[3] Demir, F., Uygunoz, D., Kıpçak, A.S., & Moroydor Derun, E. (2025). Determination of Element Contents and Health Risk Assessment of Some Commercial Coffees in Türkiye. Tekirdağ Ziraat Fakültesi Dergisi, 22, 612-622. doi:10.33462/jotaf.1400651
[4] Ramirez-Builes, V.H., et al. (2024). Physiological and Agronomical Response of Coffee to Different Nitrogen Forms with and without Water Stress. OUCI. OUCI Record
[5] da Gama, T.C.P., Sales Junior, J.C., Castanheira, D.T., Silveira, H.R.O., & de Azevedo, H.P.A. (2017). Anatomy and physiology of leaf coffee plants in different fertilizing levels. Coffee Science, 12(1), 42-48. UFLA
[6] Sandlie, I., et al. (1980). In vitro effect of caffeine on some aspects of nitrogen metabolism in isolated rat hepatocytes. Mutat. Res. (Referenced in [citation:6])
[7] West Bengal Chemical Industries Limited. (2025). Comparative Analysis of Mineral Content in Coffee Beans and Mineral-Fortified Coffee Products. WBCIL Blog. wbcil.com
[8] Martinez, H.E.P., Bohorquez, C.A.A., & Cecon, P.R. (2024). Efficiency of absorption, translocation, and use of nitrogen by water-stressed coffee. Acta Scientiarum Agronomy. UFV
[9] Nutrient Concentration in Leaves, Branches, and Reproductive Organs of Coffea canephora Genotypes in Three Phenophases. (2025). Horticulturae, 11(8), 872. MDPI
[10] Carr, N.F., et al. (2020). Coffee seedlings growth under varied NO₃⁻:NH₄⁺ ratio: Consequences for nitrogen metabolism, amino acids profile, and regulation of plasma membrane H⁺-ATPase. Plant Physiology and Biochemistry. PMID:32516683

* Additional references available in the complete Publications Database. All sources are peer-reviewed.