Plants need light for its growth and development. The major aspects of light include quantity, quality, and duration influence plant growth. Light is obtained from the sun, and these factors influencing plant growth depend on the time of the year season, weather and geographical location.
The quantity of light:
Plants require light for photosynthesis to generate energy. The quantity of light influences the rate at which photosynthesis takes place. The rate of photosynthesis increases when the Photosynthesis Active Radiation (PAR) is increased. Photosynthesis takes place at different at different light levels for each plant, also called the compensation point. Here, the light energy is enough for photosynthetic activity as more oxygen is produced than needed for respiration. The light saturation point is reached when the photosynthesis reaches the maximum point where more light does not lead to increased photosynthesis activity.
Light Quality
Defined as the wavelength or color. The sun radiates up to 2800nm and can be divided into three regions. The ultraviolet, visible and infrared light respectively. Higher energy means lower wavelength. Ultraviolet light leads to damaged DNA reducing the rate of photosynthesis, pollination and flowering decreases and plant development affected. Photosynthetic activity is at the peak at the blue light. The red light is another peak for light absorption, vegetation, and leaf growth and helps reduce plant stretching.
Light duration
Also called photoperiod and is defined as the number of hours of daylight that influences the flowering. Plants may be divided into three classes based on the number of hours needed to trigger flowering; short-day plants, long-day plants, and day-neutral plants.
Light is important for photosynthesis process and increased plant growth.
Describe the influence of temperature on plant growth and various considerations of a greenhouse grower about cultivating a crop for market. Utilize the terms in your answer (Max/Min temperature, DIF, Node/Internode, vapor pressure deficit/gradient)
The surrounding temperature greatly affects the rate of plant growth and development. The temperature ranges from minimum, maximum and optimum for each species. The impacts of temperature can be improved under high-pressure deficits since the viability of pollen is a property of the moisture contents which is greatly influenced by the vapor pressure deficit. The minimum temperatures are affected by changes in the mesoscale present in atmospheric water vapor content. Minimum temperatures affect the rate at which plants that respire at night hence reducing biomass and crop yield. At maximum temperatures decreases the yield when the threshold limit is reached.