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Der Einfluß von Bor auf das Kationen‐Anionen‐Gleichgewicht von Tomatenpflanzen
Author(s) -
Merkel D.
Publication year - 1975
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19751380405
Subject(s) - chemistry , boron , oxalate , nitrogen , yield (engineering) , inorganic chemistry , nuclear chemistry , organic chemistry , materials science , metallurgy
Influence of Boron on the Cation Anion Balance in Tomato Leaves . Tomato plants were grown in nutrient solutions containing 10 ‐3 to 1 ppm B. Maximum yield was obtained at 10 ‐1 ppm B. Boron deficiency resulted in a yield depression of about 60%. The boron content of the leaves increased from 5 ppm at low to 89 ppm at high boron supply. Nitrogen and ion contents of the leaves were affected by boron deficiency in the following way: 1. Total and organic N, K. the sum of cations, and the sum of inorganic anions were depressed. 2. The (C‐A)‐value, i.e. the toal content of organic ions, remained almost unchanged. The citrate and malate contents were increased, oxalate and pectinate decreased. . In plants of adequate boron supply the amount of organic nitrogen and sulphur exceeded the organic anion content by 97 to 114 meq./100 grs.d.m., — in deficient plants only by 25 meq. This is explained by the assumption that the transport of carboxylates from the leaves to the root via phloem is reduced by B‐deficiency.