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Nodulation and Nitrogen Fixation by Two Soybean Varieties as Affected by Phosphorus and Zinc Nutrition 1
Author(s) -
Demeterio Jefren L.,
Ellis Roscoe,
Paulsen Gary M.
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/agronj1972.00021962006400050003x
Subject(s) - leghemoglobin , nitrogen fixation , nodule (geology) , nitrogenase , zinc , biology , nitrogen , phosphorus , agronomy , shoot , plant nutrition , symbiosis , glycine , nutrient , chemistry , root nodule , biochemistry , amino acid , bacteria , paleontology , ecology , genetics , organic chemistry
Symbiotic N fixation by soybeans [ Glycine max (L.) Merr.] is one factor determining yields of this important crop. Microelements have been shown to be important in metabolic processes in plants. This investigation was conducted to determine the effects of Zn and P on growth, nodulation, and N fixation, in two soybean varieties grown in solution cultures. Zinc deficiency decreased shoot weights, Zn concentrations in all plant parts, nodule weights, nodule leghemoglobin concentrations, and amounts of N fixed. Growth and P and Zn concentrations in one or more plant parts and nodule weights were greater for the P‐tolerant variety than for the P‐sensitive variety. Excess P decreased growth of all plant parts, nodule weights, nodule leghemoglobin concentrations, and amounts of N fixed. Nodule weights and amounts of N fixed were greater for the P‐tolerant variety, particularly at the higher P level. Zinc deficiency and excess P may influence N fixation directly by affecting nodule nutrition and indirectly by affecting host nutrition.