Soil ChemistryAcidifying the soil or lowering the pHElemental 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

Soil Fertility16 elements required for plant growth

C HOPKNS CaFe Mg B Mn CuZn Mo Cl

C. Hopkins Caf managed by mine cousins Mo and Cleo

Soil FertilityC, 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

Soil Fertility

Soil Fertility

Not fertility, excess light!

Soil Fertility

Soil Fertility

Soil FertilityOrganic fertilizers The only choice up until the 1940sManureFishmealSeaweedBloodmealBonemealCottonmealSewage sludgeThese often contain micronutrients