Alam Sekitar/ Eko- Fisiologi

Factors Affecting Plant Growth & Development

•Energy (Light/ Temperature)

•Water

•Soil & Nutrients

•Genetic Factors

•Biotic Factors

Three aspects of light

•Quantity: intensity or concentration of light

•Quality: colour (wavelenghth og light)

•Duration: length of light period (photoperiod)

SOLAR RADIATION

* Sun -> earth's source of energy

* Sun's Radiation at speed of 300,000 km/s

* Radiation emitted in waves.

Units of light intensity

- Foot candle(fc) : Old unit

- Klux = Kilo lux = 1,00 lux

1 lux  =  1 lumen per m 2

Effects of Solar Radiation

- Electromagnetic Radiation reaching earth's surface.

- Effect of solar Radiation depends on QUALITY, QUANTITY, PHOTOPERIOD.

Light Effects

- Light intensity is measured in: lux

-Light intensity at sea level : 108,000 lux

- Light compensation Point: Point at which the rate of photosynthesis equals rate of respiration.