. Bulletin. L'agriculture. Sur Ijifliionoo cortaiu^ d'un ratio ])4wcon Liino et Magniesia. 497 Les expériences suivantes seront, en effet, qu'un développement normal et de bon de cette plante dépend dans une large mesure de la proportion de chaux et de magnésie offert aux racines. Expérimenter avec U^ater la culture. Trois jeunes plants de mûrier (var. Takasuke) avec des tiges d'environ 15 cm de hauteur ont été placés le 9 juin, dans des récipients en verre de 3 litres contenant les solutions suivantes :-• Ca (X03)3.. Mg (NO3}, (donc, FeSO NHJ, 11. III. o-5 % 0,1 % trace. 0,5 % 0,1 % trace sur juillet II, il n'y a pas encore d'autres différents

• Contributeur: Library Book Collection
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. Bulletin. Agriculture. On tlie Ijifliionoo of a cortaiu Ratio ])(4wcon Liino and Magniesia. 497 The following experiments will prove, indeed, that a normal and good development of this plant depends to a great extent on the ratio of lime and magnesia offered to the roots. Experiment with U^ater Culture. Three young mulberry plants (var. Takasuke) with stems about 15 cm. high were placed June 9, in glass vessels of 3 litres capacity containing the following solutions:—• Ca (X03)3.. Mg (NO3}, (NHJ, SO, FeSO 11. III. o-5% 0.1% trace. 0.5% 0.1% trace On July II, there was not yet any other difference observed except in the number of rootlets that had developed. There were very numerous root- lets in I and II, while none in III. On July 25, it could be clearl}' noticed that in solution III, the leaves developed were very small and of pale green color. On August 8, these small leaves had withered hile those developed in the other two solutions appeared healthy and of dark green color, but it was further noticeable that the leaves in I were darker green and smaller than those in solution II. Further, while no rootlet were developed in solution III. numerous rootlets had appeared in I and II. This experiment shows that an excess of mag- nesia over lime is ^er' injurious ^(^x the mulberr' tree. Rxperi)uent ivitJi Soil Culture. l^ach pot contained about 3.8 K. ilry soil of an unmanureil field from Nishigahara, Tokyo. The content, in the fine earth, of lime antl magnesia soluble in hot concentrated In'drochloric aciil was as follows : —. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Tokyo Daigaku. Nogakubu. Tokyo

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