Light and Plant Growth

2.

Fundamentals of Light

2.1.

The Nature of Light

2.1.1.

Electromagnetic Spectrum

2.1.1.1.

Visible Light Range

2.1.1.2.

Ultraviolet Light

2.1.1.3.

2.1.2.

Photons and Wavelengths

2.1.2.1.

Definition of a Photon

2.1.2.2.

Relationship Between Wavelength and Energy

2.2.

Properties of Light Relevant to Plants

2.2.1.

2.2.1.1.

2.2.1.2.

2.2.1.3.

2.2.1.4.

2.2.1.5.

Ultraviolet Light

2.2.2.

2.2.2.1.

Units of Measurement

2.2.2.1.1.

Micromoles per Square Meter per Second

2.2.2.1.2.

2.2.2.1.3.

2.2.2.2.

Factors Affecting Intensity

2.2.2.2.1.

Distance from Source

2.2.2.2.2.

Angle of Incidence

2.2.2.2.3.

Physical Obstructions

2.2.3.

2.2.3.1.

2.2.3.2.

2.2.3.3.

Seasonal Variation

2.3.

Measuring Light for Plant Growth

2.3.1.

Photosynthetically Active Radiation

2.3.1.1.

Definition and Range

2.3.1.2.

Importance for Photosynthesis

2.3.2.

Photosynthetic Photon Flux Density

2.3.2.1.

Measurement Techniques

2.3.2.2.

Relevance to Plant Growth

2.3.3.

Daily Light Integral

2.3.3.1.

Calculation and Units

2.3.3.2.

Impact on Plant Productivity

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1. The Dual Role of Light for Plants

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3. Photosynthesis