The lead content of various plant species as affected by cycle‐lite™ humus

Four rates of Cycle‐Lite™ Humus ranging from zero to 50% of the soil volume were incorporated into a Lakeland loamy sand and a Matapeake silt loam. Selected test species were seeded immediately after incorporation of the humus and after a six month incubation. The Pb content of the top growth of plants grown in soil modified with this product was not elevated even though the humus contained 300 ppm of lead.