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THE EFFECT OF FREE AND CLAY‐BOUND HUMIC MATTER ON THE UPTAKE OF SULPHATE BY ROOTS
Author(s) -
DELL'AGNOLA G.,
FERRARI G.
Publication year - 1974
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1974.tb01130.x
Subject(s) - humus , chemistry , sephadex , pyrophosphate , sodium hydroxide , organic matter , montmorillonite , humic acid , sodium , environmental chemistry , inorganic chemistry , nuclear chemistry , organic chemistry , soil water , geology , soil science , enzyme , fertilizer
Summary Humic substances stimulate the amount of sulphate actively transported by excised barley roots to an extent depending on the humification pattern of the original soil organic matter. Humic fractions separated on Sephadex differ in their effects on the active transportation of sulphate by roots; both the carboxyl‐to‐phenolic OH ratio and the molecular weight strongly affect the biological activity of the fractions. In contrast, the procedure used to extract the humic material (sodium hydroxide or sodium pyrophosphate) has little influence. When the humic material is complexed with montmorillonite, sulphate uptake is further enhanced.