Soil Fertility and Fertilizers |
Contents
FERTILIZERS IN A CHANGING WORLD | 1 |
Chapter | 4 |
Soil Fertility During the First Eighteen Centuries A D | 9 |
Copyright | |
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absorbed acid soils added addition agricultural Agronomy alfalfa alkaline ammonium nitrate ammonium sulfate amount anhydrous ammonia applied boron CaCO3 calcium calcium cyanamide carbon cations cent chemical chloride clay compounds concentration contains copper corn cost crops decomposition deficiency deposits effect exchange factors farm farmer fertilizer materials fertilizer phosphorus field fixation higher-analysis hydrogen important increase ions iron K₂O leaching legumes lime limestone liming materials magnesium manganese manufacture manure metaphosphate method mineral mixed fertilizers mixture moisture nitrification nitrogen obtained occur ordinary superphosphate organic matter oxide phos phosphate rock phosphorus plant growth plant nutrients potash potassium potassium chloride potassium sulfate production quantities reaction residues result rock phosphate roots salts samples shown sodium nitrate soil pH Soil Sci soil tests soluble solution sulfuric acid superphosphate supply Table temperature tion tons trace elements tricalcium phosphate United urea water-soluble yield zinc