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Response of Soybeans to a Morphactin 1
Author(s) -
Clapp J. G.
Publication year - 1975
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1975.0011183x001500020003x
Subject(s) - point of delivery , biology , glycine , agronomy , horticulture , zoology , maturity (psychological) , field experiment , amino acid , psychology , developmental psychology , biochemistry
Morphactins (a group of plant growth regulating chemicals) were observed to inhibit apical growth on soybeans [ Glycine max (L.) Merr.] in North Carolina during 1971. One material, EMD‐7301 (containing 12.5% of methyl‐2‐ chloro‐9‐hydroxyfluorene‐(9)‐carboxylate) was evaluated under field conditions to determine the effects on plant height, lodging, seed weight, pods/plant, seed/pod, maturity, and grain yields. Foliar applications of EMD‐7301 at rates of 12.4, 24.7, 49.4, 98.8, 197.7, and 790.7 ml/ha at flower initiation failed to increase soybean yields over a 2‐year period. A 10.5% yield increase occurred during the first year of study with the 49.4 ml/ha rate. Plant height was reduced by all application rates. Lodging was reduced by the 98.8 ml/ha rate. The highest rate of application (790.7 ml/ha) delayed maturity by 10.5 days, reduced the number of pods/plant by 54.5% and seed/pod by 19.4%, and had no effect on seed weights.