Evaluation of Phosphorus Nutrient Status in Seedling Lettuce1
Open Access
- 1 May 1971
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 96 (3) , 341-344
- https://doi.org/10.21273/jashs.96.3.341
Abstract
Lettuce seedlings were grown in a modified Hoagland’s solution, with 9 treatments ranging from 0.06 to 16.0 mM/liter of H2PO4. In the low P solutions the deficiency symptoms shown by lettuce seedlings consisted of leaves showing a darker green and reduced growth. Tissue levels of soluble PO4–P in these deficient seedlings dropped to a low of 379 ppm PO4–P and a high of 13770 ppm PO4–P for plants well supplied with P. The critical level for the evaluation of the P nutrient status of seedling lettuce plants in the conductive, lamina, and root tissue were respectively: 780, 600, 580 ppm soluble PO4–P on a dry wt basis.Keywords
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