LaMotte SMART 3 Electronic Soil Lab - Manual (Page 85)

SMART3 Soil 1.11 85
ZINC
ZINCON METHOD • CODE 3667-SC
QUANTITY CONTENTS CODE
30 mL *Zinc Indicator Solution *6314-G
120 mL *Methyl Alcohol *6319-J
10 g Sodium Ascorbate Powder 6316-D
25 g *Zinc Buffer Powder *6315-G
15 mL *Sodium Cyanide, 10% *6565-E
30 mL *Formaldehyde Solution, 37% *5128-G
1 “Dilute Zinc Indicator Solution” Bottle, w/1
pipet assembly
0128-MT
1 Graduated Cylinder, 10 mL, glass 0416
1 Spoon, 0.5 g, plastic 0698
2 Pipets, plain, plastic 0352
1 Spoon, 0.1 g, plastic 0699
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
The availability of zinc in soils decreases with an increase in soil pH. Some
soils that are limited above pH 6.0 may show a zinc deficiency especially in well
drained sandy soils. A nutrient interaction exists between soils that have a high
phosphorous level and show a zinc deficiency even though zinc levels were
sufficient. This interaction is due to the preferential uptake of phosphorus instead
of zinc and the possible formation of insoluble zinc phosphates. Once zinc is
applied to the soil, it is relatively immobile because it is readily absorbed by
organic matter in the soil.
Zinc is essential in promoting certain enzyme reactions in the soil and is required
for the production of chlorophyll and the formation of carbohydrates in plants.
Test P
rocedures