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Effects of Lime and Boron on Brown‐heart, Leaf Tissue Calcium/Boron Ratios, and Boron Concentrations of Rutabaga
Author(s) -
Gupta Umesh C.,
Cutcliffe J. A.
Publication year - 1972
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/sssaj1972.03615995003600060029x
Subject(s) - lime , boron , calcium , brassica , chemistry , plant tissue , zoology , horticulture , botany , biology , organic chemistry , paleontology
A greenhouse study involving four levels of lime and six levels of B, and a field study at two locations involving three levels of lime and five levels of B were conducted on rutabaga ( Brassica napobrassica , Mill. var. ‘York’). Brown‐heart was more severe at high pH than at low pH under B deficiency conditions. The effect of lime on the appearance of B deficiency symptoms was a physiological effect in the plant rather than a chemical reaction in the soil. However, lime applications, generally decreased the B concentrations of leaf tissue. Calcium/B ratios in the leaf tissue were inversely related to the hot‐water‐soluble B content of the soil. Under field conditions, liming increased the Ca/B ratio of leaf tissue in most cases. Calcium/B ratios of 3,300 to 8,500 and B concentrations of 2 to 7 ppm in leaf tissue were associated with very severe brown‐heart condition. Leaf tissue Ca/B ratios of less than 400 and B concentrations greater than 40 ppm, when the roots began to enlarge were associated with roots free from brown‐heart.