Premium
NITROGEN SOURCES AND ‘A’ VALUES FOR VESICULAR–ARBUSCULAR AND NON‐MYCORRHIZAL SORGHUM GROWN AT THREE RATES OF 15 N‐AMMONIUM SULPHATE * †
Author(s) -
AMES R. N.,
PORTER LYNN K.,
JOHN T. V.,
REID C. P. PATRICK
Publication year - 1984
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1984.tb04131.x
Subject(s) - sorghum , fertilizer , agronomy , shoot , biology , mycorrhiza , nitrogen , ammonium , arbuscular mycorrhizal , symbiosis , chemistry , bacteria , genetics , organic chemistry
S ummary Mycorrhizal and non‐mycorrhizal sorghum [ Sorghum bicolor (L.) Moench] plants were grown in soil treated with one of three rates of ( 15 NH 4 ) 2 SO 4 , fertilizer. Mycorrhizal plants did not significantly differ from non‐mycorrhizal plants in total plant dry weight, total plant N, or percent utilization of the applied N by the whole plant at any fertilizer rate. However, the atom percent 15 N excess in shoots, roots and the whole plant, and percent N derived from fertilizer were significantly higher for non‐mycorrhizal plants at the intermediate level of fertilizer N. The percent N derived from native soil sources, and ‘A’ values were significantly higher for mycorrhizal plants, compared to non‐mycorrhizal plants, at the intermediate but not low or high fertilizer rates. The results suggest that, at the intermediate fertilizer rate, where plants produced the most growth, mycorrhizal sorghum plants derived N from a source that was less available to non‐mycorrhizal plants.