. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . loyed. Whencaustic magnesia was added to the usual fertilizer, theyield was grams of air-dried mangel roots, andthe ratio of lime to magnesia was to 1; when sodiumcarbonate was added, the yield was grams, and theratio of lime to magnesia was to 1; when slaked limewas used instead of the caustic magnesia or sodium car-bonate, the yields in two cases were and 132 gramsand the ratios of lime and magnesia to 1 and 3 to 1,
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . loyed. Whencaustic magnesia was added to the usual fertilizer, theyield was grams of air-dried mangel roots, andthe ratio of lime to magnesia was to 1; when sodiumcarbonate was added, the yield was grams, and theratio of lime to magnesia was to 1; when slaked limewas used instead of the caustic magnesia or sodium car-bonate, the yields in two cases were and 132 gramsand the ratios of lime and magnesia to 1 and 3 to 1,respectively. Without further addition than that of the 330 FERTILIZEBS regular fertilizer^the yield was grams and the ratio oflime to magnesia was to 1. Attention has been called elsewhere to the fact thatplants may be physiologically relieved of certain excessesof lime by its crystallizing out within them as insolublecalcium oxalate and in some cases exteriorly as calciumcarbonate. The former disposition is impossible in thecase of magnesia, because of the solubility of the mag-nesium oxalate. It must be evident, therefore, that in. Fig. 55. — Extreme Left, Redtop and Weeds. (No Clovek nor Timothy.) No lime. No fertilizer. Seeded to timothy, redtop, and clover, the same as in Figs. 52, 53, and 54. any discussion of the ratios of lime and magnesia in plants,the possibility of such storing away of some of the lime ininsoluble, and hence in inactive form, must be taken intoconsideration; yet in the instance here considered, itdoes not seem probable that this factor could have hadmuch influence on the relation of the two. It appears,therefore, as concerns the ratios of lime and magnesia withinthe plant, that there may be in some cases very wide varia-tions without an accompanying difference in yield. 484. Desirable lime and magnesia ratios in soils andculture solutions. — According to Loew,1 a relation of 2 of 1 Circular No. 10 (1909), Porto Rico Agr. Expt. Sta. MAGN
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