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Soil Chemistry. Acidifying the soil or lowering the pH Elemental sulfur (effect is temporary) Ammonium sulfate (effect is temporary) Aluminum sulfate is also used but not recommended as aluminum is a heavy metal!. Soil Chemistry. Basic soils often can cause iron chlorosis in plants
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Soil Chemistry • Acidifying the soil or lowering the pH • Elemental sulfur (effect is temporary) • Ammonium sulfate (effect is temporary) • Aluminum sulfate is also used but not recommended as aluminum is a heavy metal!
Soil Chemistry • Basic soils often can cause iron chlorosis in plants • This can be corrected by acidifying the soil • or choosing a plant which is tolerant of • alkaline soils! • Intervienal chlorosis: often on • acid-loving plants like roses, fruit trees, • azaleas and rhododendrons
Blue in acidic soils <5.5 with available aluminum Pink in neutral soils near pH of 7
Soil Fertility • 16 elements required for plant growth • C HOPKNS CaFe Mg B Mn CuZn Mo Cl • “C. Hopkins Café managed by mine cousins Mo and Cleo”
Soil Fertility • C, H, O from the atmosphere & water • Macronutrients: N, P, K most often deficient in soils. Also, S, Ca, Mg • Micronutrients: Fe, B, Mn, Cu, Zn, Mo, Cl
Soil Fertility • Organic fertilizers • The only choice up until the 1940’s • Manure • Fishmeal • Seaweed • Bloodmeal • Bonemeal • Cottonmeal • Sewage sludge • These often contain micronutrients
