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Effect of Root‐absorbed 2,3,5‐Triiodobenzoic Acid on Nutrient Absorption and Growth by Soybeans 1
Author(s) -
Ohki K.,
McBride L. J.
Publication year - 1972
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1972.00021962006400020031x
Subject(s) - nutrient , absorption (acoustics) , shoot , elongation , glycine , plant stem , horticulture , agronomy , chemistry , botany , biology , amino acid , materials science , biochemistry , ultimate tensile strength , metallurgy , composite material , organic chemistry
Foliar application of 2,3,5‐triiodobenzoic acid (TIBA) has been recently used on soybeans [ Glycine max (L.) Merr.] to enhance yields. Root application appeared as an alternative naethod of applying TIBA to the plant. This study was initiated to provide information on effects of root‐absorbed TIBA on growth, nutrient absorption, and nutrient distribution. Plants were grown, in Hoagland solution with TIBA at eight levels from 0 to l0 ppmw. Nutrients absorbed were determined by their disappearance from samples taken periodically. Although young leaves and internodes showed no visible response at concentrations lower than 5 ppmw. typical symptoms were observed at 5 and 10 ppmw TIBA. The 10‐ppmw dosage reduced elongation of the stems. Roots were more sensitive than tops to TIBA, and morphological effects were observed as low as 0.1 ppmw. Shoot/root ratios showed that TIBA equally influenced the dry weights of these tissues. TIBA appeared to enhance the rate of P uptake from the nutrient solution. Within a 6‐day period 5 ppmw TIBA enhanced total P uptake about 25% above controls, while absorption of NO 3 ‐N, K, Ca, Mg, Mn, and Fe was not influenced.