リソース タグを付けた: Nitrogen Content
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The purpose of this bulletin is to describe methods applied to utilize nitrogen-fixing systems in soil improvement and management and the consequent increases in crop yields obtainable by these methods. The rest of the integrated systems involved i.e. chemical and physcial manipulations, are...
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1965/01/01 A major objective of modern soil science and agronomy is to put together farm management systems that will maximize the efficiency of food production and reduce costs. This monograph summarizes known facts and principles for an important component of the system and therefore will find extensive...