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Fertilizers in a Changing World
Soil Fertility During the First Eighteen Centuries a d
Development in the United States
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absorbed acid soils added addition agricultural Agronomy alfalfa ammonium ammonium sulfate amount anhydrous ammonia applied boron bushels calcium calcium cyanamide carbon cation chemical clay compounds concentration considerable contains corn cost cover crops decomposition decrease deficiency deposits effect exchange farm farmer fertilizer materials fertilizer phosphorus field fixation growth factor higher-analysis hydrogen important increase ions iron leaching legumes lime limestone loam magnesium manganese manufacture manure method mineral mixed fertilizers mixture moisture neutralizing nitrate nitrification nitrogen obtained organic matter oxide phos phosphate rock phosphorus placement plant growth plant nutrients potash potassium chloride production quantities reaction residues result rock phosphate roots rotation salts samples shown sodium sodium nitrate soil conditions soil fertility soil pH soil tests soluble solution soybeans sulfate sulfur sulfuric acid superphosphate supply Table temperature tion tons tricalcium phosphate United usually water-soluble yield zinc