Light Penetration and Light-induced Seed Germination in Soil

摘要: Light penetration through a Drummer silty clay loam and Broomfield sand was measured spectrophotometrically biologically. The spectrophotometric measurements showed that less than 1% of the incident light penetrated 2.2 millimeters at any wavelength between 350 780 nanometers for ped sizes up to 1 millimeter. Biological with light-sensitive lettuce (Lactuca sativa) seeds in soil an exposure equivalent about sunny day induced some germination which were 2 below surface, but did not affect 6 surface.