. Nature study and agriculture. Nature study; Agriculture. SOILS 153 tilizers may be used to supply the deficiency, but in ordinary farming they are too expensive. (2) The nitrogen may have been carried away in drainage waters. Especially in sandy soils, the rain water as it sinks in carries with it the soluble matter, and the nitrogen compounds are the most readily dissolved of all the plant foods. (3) In some regions the land is impoverished because the richest surface soil is gradu- ally carried away by wind or by running water from Appakatus to Test the Capacity op Soils to Hold Wa
. Nature study and agriculture. Nature study; Agriculture. SOILS 153 tilizers may be used to supply the deficiency, but in ordinary farming they are too expensive. (2) The nitrogen may have been carried away in drainage waters. Especially in sandy soils, the rain water as it sinks in carries with it the soluble matter, and the nitrogen compounds are the most readily dissolved of all the plant foods. (3) In some regions the land is impoverished because the richest surface soil is gradu- ally carried away by wind or by running water from Appakatus to Test the Capacity op Soils to Hold Water There are sections where more fertiHty is lost in this way than is used up by crops. (4) Unproductiveness may result from bad physical condition caused by bad tillage, especially cultivation when the land is too wet. (5) The most prev- alent and most fundamental cause of unproductiveness is the exhaustion of humus. That implies these specific faults: (o) The soil no longer holds the moisture supply so well as it did formerly, (b) It is less porous and otherwise less favorable to root growth, and it" bakes " more easily, (c) De-. 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 Schmidt, Charles Christian, 1859-. Boston, New York [etc. ] D. C. Heath & Co
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