. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 392 LEGUMES LEGUMES. Fig. 588. Root nodules. Red pIo- veT(Trifolium pratense). One and one-fourth times natural size. Legume Root-tubercles. (Figs. 588-592.) By George F. Atkhison. The legume root-tubercles, or "nodules," are small galls on the roots of leguminous plants, which are caused by the activities of minute bacteria present in the soil wherever leguminous pla
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 392 LEGUMES LEGUMES. Fig. 588. Root nodules. Red pIo- veT(Trifolium pratense). One and one-fourth times natural size. Legume Root-tubercles. (Figs. 588-592.) By George F. Atkhison. The legume root-tubercles, or "nodules," are small galls on the roots of leguminous plants, which are caused by the activities of minute bacteria present in the soil wherever leguminous plants grow. The galls vary in form on dif- erent species or gen- era, being oval on the red clover, rounded and slightly lobed on the soybean, cylindri- cal or club-shaped, simple or branched once or twice, on the y^^r yxv. .'\ vetch (Vieia saliva), 1' 4^^ or many times dichot- omously branched into a rounded mass, as in Mcdicago den- ticulata. They are whitish or of a pale flesh-color, sometimes sordid brown in age. They occur on the roots of nearly all leguminous plants, but are absent on some, as, for example, on the honey locust (Gleditschia triacanthos). History of the study of root-tubercles. WTiile the history of the study of these root- tubercles of leguminous plants is extremely inter- esting, reference can be made here only to a few of the diverse views which have been entertained as to their nature, origin and significance. Some of the early observers thought that they were galls produced by insects, or by eel-worms. By others they were regarded as lateral roots with dwarf growth, or swollen lateral root organs for the purpose of absorbing food, while others held that they were lenticels which played some physiological role in the life of the plant. They were also thought by others to be imperfect buds which could repro- duce the plant. They were classed as fungi of the genus Sclero- tium by some, or as pathological out- growths. Since Wor- onin, in 1866, discov- ered
Size: 1189px × 2100px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookidcyclopediaoffarm00bailuoftbookyear1922
