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23 > Image 23 of Annual report. 1926

Part of Kentucky Agricultural Experiment Station

Kentucky Agricultural .E.l"[)CI'li}7ZCll{ Smlion 17 ` conditions but not under acid conditions, whereas in other soils, the reverse is the ease. The Occurrence and Distribution of Manganese. Results obtained with manganese as a cure for chlorosis under field conditions check and confirm the results obtained under ex- perimental conditions and afford evidence that manganese is vitally concerned in the synthesis of chlorophyll which is a fundamental factor i11 the growth of plants and in the produc- tion of foods. The results further show that certain plants l apparently require more of this element for their normal growth than others and accordingly thrive best on soils con- _taining relatively large amounts of this element. Results obtained with corn plants grown in sand cultures show that a small amount of copper apparently has an additional beneficial effect on the growth of plants in connection with manganese. Results were also obtained with buekwheat which showed that I perfect seeds developed only in cultures containing a combina- tion of manganese, copper, zine and boron, indicating that zinc and boro11 llltiy have some function in the fructification of plants. i Experiments showed that rats fed a synthetic diet contain- ing small amounts of organic compounds of the elements man- ganese, copper, zinc and nickel, have a longer survival period and attain a larger weight than do rats confined to a diet from which these metals are excluded as nearly as possible. Analytical results show that Kentucky bluegrass, Poo pratcizsis, is relatively rich in manganese, copper and zinc, and contains traces of nickel and cobalt. \Vhen fresh green blades of bluegrass a1e air-dried in the shade, finely ground, and fed to rats in connection with a synthetic diet without the metals mentioned, the rats make a. fairly normal growth, which indi- catcs that this important forage crop contains the growth pro- rnoting properties in a fairly ample an1ou11t. A considerable amount of the green blades of bluegrass was extracted with hot alcohol, which removed practically all the chlorophyll. Rats confined to a synthetic diet plus the chlorophyll-free bluegrass ` blades did 11ot thrive as well as others receiving the unaltered