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Conservation of Fertilizer Materials from Minor Sources

Charles Cloyes Fletcher

出版	U.S. Department of Agriculture, 1932
URL	http://books.google.com.hk/books?id=nvx0oSW8uNAC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

In maintaining soil fertility the periodic addition of organic matter plays and important part. Composts are constantly being made through the rotting of leaves, twigs, roots, and other organic matter as shown by the photograph on the title page of this publication. Composts of various substances may help supply organic matter, and they also often supply nitrogen, phosphoric acid, potash, and other elements needed by plants.