Soil Science · 1918 · 26 citations · 0 references
AgricultureAgronomySoil SciencesSoil ChemistrySoil FertilitySoil ScienceNutrient UptakeSoil AciditySoil EvaluationSoil Fertility EvaluationSoil Fertility ManagementSoil PhHydrogen Ion ActivitySoil Acidity TestingSoil Fertility Potential
Laboratories of the Office of Soil Fertility, Bureau of Plant Industry, United States Department of Agriculture