. Character and treatment of swamp or muck soils [microform]. Améliorations foncières; Drainage; Reclamation of land; Zones humides; Drainage; Wetlands. The only point worthy of note in the quantities of lime, magnesia, aluminum, and iron contained in the various soils, is the high lime con- tent in every soil analysed. This might readily be explained in soils No. i8, 19, which were underlaid by a bed of marl, and where deep cultivation had been practised, but how are we to explain the presence of over 5 per cent, of lime in soil 20, and over 4 per cent, in soil 21, where the subsoil was one o
. Character and treatment of swamp or muck soils [microform]. Améliorations foncières; Drainage; Reclamation of land; Zones humides; Drainage; Wetlands. The only point worthy of note in the quantities of lime, magnesia, aluminum, and iron contained in the various soils, is the high lime con- tent in every soil analysed. This might readily be explained in soils No. i8, 19, which were underlaid by a bed of marl, and where deep cultivation had been practised, but how are we to explain the presence of over 5 per cent, of lime in soil 20, and over 4 per cent, in soil 21, where the subsoil was one of pure sand. This high lime content of the swamp soils of Ontario seems to be one of their characteristics. For of 54 samples analyzed in this laboratory all gave a high liine content. The presence of so much lime might be due to the percolation of seep- age water from higher land. In a clay loam .'such high lime percentages are rarely met with. When we consider the importance of lime in the. Fio. A.—Celery grown oir unfertilized toil. soil, and particularly in relation to swamp soils, the significance of this high lime content is seen. It is worthy of note that lower percentages of potash, phosphoric acid, and nitrogen are considered adequate when a high percentage of lime is present. Coming now to the more important mineral soil constituents, namely, potash and phosphoric acid, it will be seen, that in general these soils appear to be deficient in total potash, ond in very many cases in total phosphoric acid, though the latter seems to be pres'-it in greater amounts than the former. Some few soiTs in which the sh content is well up to the average, or even above it, may be ex) ,c(I by the fact that the swamp soil may be but shallow in fi'epth and over- lies a rich clay subsoil containing large amounts of potash which, by deep and frequent cultivation has become mixed with the top soil. Mucks overlying sands are invariably deficient in potash. =^!S^. Please note that these
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