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VARIATION IN ELEMENTAL CONTENT OF LETTUCE GROWN UNDER BASE-LINE CONDITIONS IN FIVE CONTROLLED-ENVIRONMENT FACILITIES
Citation:
Berry, W., D. Krizek, D. Ormrod, J. McFarlane, AND R. Langhans. VARIATION IN ELEMENTAL CONTENT OF LETTUCE GROWN UNDER BASE-LINE CONDITIONS IN FIVE CONTROLLED-ENVIRONMENT FACILITIES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-81/561 (NTIS PB82224171), 1982.
Description:
An interlaboratory comparison was made of the variation in elemental concentration of leaf lettuce (Lactuca sativa) plants grown under base-line conditions for 28 days in 5 controlled-environment facilities. Two studies were conducted by each of 5 investigators using a sphagnum peat-vermiculite mix obtained from a common source. Plant tissue from all studies was collected and analyzed at 1 laboratory for 10 essential elements (P, K, Ca, Mg, Fe, Mn, B, Zn, Cu, Mo) and 10 non-essential elements (Al, Si, Ti, Sr, Ba, Na, Pb, V, Li, and Sn) by arc emission spectrography. The 10 essential elements occurred at concentrations adequate for normal lettuce growth.