Msg # 5155   
Date: 04 May 93 22:23:00
From: Jeff Burns
  To: All
Subj: More stuf part 2
____________________________________________________________________________

AREA:SUST_AG
MSGID: 1:346/16.0 2be72514
                         Secondary  Nutrients (cont.)

Element:  Magnesium

Function in Plant:  Essential in chlorophyll, formation of amino acids and
vitamins.  Neutralizes organic acids.  Essential in formation of fats and
sugars.  Aids in seed germination.

Forms in soil:  Present as Mg++ ion on cation exchange sites, or in soil
solution.

Deficiency symptoms:  Plants usually chlorotic (interveinal yellowing of
older leaves); leaves may droop.

Losses from soil: Leaching, plant removal, and erosion.  Some losses by
fixation to unavailable form in acid peaty soils.

Natural Sources:  Mica; hornsblende; dolomite; serpintine; certain clays.

Deficiency may be induced by excess of:  Calcium, potassium, ammonium.

Excess may induce a deficiency of:  Potassium, zinc, boron, manganese.

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Element:  Sulfer

Function in plant:  Essential ingrediant in amino acids and vitamins.
Flavors onions and cruciferous plants.  Necessary for oil formation and
nitrogen fixation by legumes.

Forms in soil:  Organic compounds; soluable sulfates, sulfites, and sulfides.

Deficiency Symptoms: Light green leaves, reduced growth, yellowing of leaves.
Weak stems.  Similar to Nitrogen deficiency.

Losses from soil:  Erosion, leaching, crop removal.

Natural sources:  Organic matter, atmospheric sulfer fixed by microbes;
pollutants in rain water.

Deficiency may be induced by an excess of:  Carbon, Nitrogen

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