User Guide

SULPHURSULPHUR

SULPHUR

Sulphur (S) is a constituent of plant proteins and hormones. Plants

take up sulphur in the form of sulphate ions (SO

PRESENT IN

proteins, hormones, vitamins and essential oils

ACTION • plant metabolism

• stimulates absorption of atmospheric nitrogen

SHORTAGE • upper leaves remain small, and curl downward

EFFECTS • yellowing of younger leaves

EXCESS EFFECTS • reduction of growth and leave size

• leave symptoms often absent or poor defined

• sometimes interveinal yellowing and burning

Phosphorus HR

INTERFERENCES

Calcium above 10000 mg/L as CaCO

Chloride above 150000 mg/L as Cl

–

Ferrous iron above 100 mg/L

Magnesium above 40000 mg/L as CaCO

Sulfide

x 10

• Wait for a few seconds and the

display will show "-0.0-". Now

the meter is zeroed and ready for

measurement.

• Remove the cuvet.

• Add 10 drops of HI 93706A

Molybdate reagent.

• Add the content of one packet of

HI 93706B Phosphorus Reagent

B (Amino Acid) to the cuvet.

Replace the cap and shake gently

until dissolution is complete.

• Reinsert the cuvet into the

instrument.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 5 minutes and press READ

DIRECT. In both cases "SIP" will blink during measurement.

• The instrument directly displays concentration in mg/L of phosphorus

(P) on the Liquid Crystal Display.

• To convert the reading to mg/L of phosphate (PO

3–

), multiply by

a factor of 3.07.