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Welcome to your Interpretation of Soil Analysis Course!

Since the beginning of agricultural science approximately during 1240, interest in plant production considers aspects like;

Return to the soil that was removed by plants (circa 1563).
Plants contain salts extracted from the soil (circa 1630).

The search for the “Principle of Vegetation” (1630-1750) was enhanced when it was discovered that additions of materials like blood, manure and dead animal carcasses, contribute to better plant production. The studies of plant nutrients during 1750 to 1800 indicate that plant food is more than one thing when applications of saltpetre (potassium nitrate), vitriolated water (potassium sulphate) and Epsom salt (magnesium sulphate) improved plant growth.