How Crops Feed: A Treatise on the Atmosphere and the Soil as Related to the Nutrition of Agricultural Plants

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Orange Judd, 1896 - 359 páginas
 

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Página 375 - ... of absolute, but of relative insolubility, and are kept available to the plant by the continual circulation in the soil of the more abundant saline matters. The soil (speaking in the widest sense) is then not only the ultimate exhaustless source of mineral (fixed) food, to vegetation, but it is the storehouse and conservatory of this food, protecting its own resources from waste and from too rapid use, and converting the highly soluble matters of animal exuviae as well as of artificial refuse...
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