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The Effect of Calcium, Phosphorus, and Iron on the Tolerance of Lespedeza to Manganese Toxicity in Culture Solutions
Author(s) -
Morris H. D.,
Pierre W. H.
Publication year - 1948
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1948.036159950012000c0088x
Subject(s) - lespedeza , manganese , library science , phosphorus , horticulture , chemistry , computer science , agronomy , biology , organic chemistry
Results of investigations to determine the effects of calcium, phosphorus, and iron on soluble manganese are summarized. Lespedeza made excellent growth in culture solutions of pH 4.6 with calcium concentrations as low as 12 ppM. An increase in the calcium concentration of the culture solution from 12 to 60 or to 300 ppM was ineffective in reducing manganese toxicity. There was some indication that manganese toxicity was increased at the higher calcium levels. An increase in manganese toxicity was obtained by increasing phosphorus in the culture solution from 2 to 20 ppM. An increase in the concentration of iron in culture solutions up to 1 ppM resulted in marked reduction of the toxicity from a given concentration of manganese. An iron concentration of 2.5 ppM resulted in decreased growth regardless of the manganese concentration. The iron-manganese ratio of the culture solution was not a primary factor in the growth of lespedeza. Good growth was obtained over a wide range of iron-manganese ratios. The beneficial effect of iron in reducing manganese toxicity was due to a decrease in manganese absorbed by the plant rather than an increase in iron absorption. 14 references, 3 figures, 5 tables.