User Guide

pH is the measure of the hydrogen ion concentration [H

]. Soil can be acid,

neutral or alkaline, according to its pH value.

Fig. 1 shows the relationship between the scale of pH and types of soil. Most

plants prefer a pH range from 5.5 to 7.5; but some species prefer more acid or

alkaline soils. Nevertheless, every plant requires a particular range of pH, for

optimum growth.

pH strongly influences the availability of nutrients and the presence of micro-

organisms and plants in the soil.

For example, fungi prefer acidic conditions whereas most bacteria, especially

those supplying nutrients to the plants, have a preference for moderately acidic

or slightly alkaline soils. In fact, in strongly acidic conditions, nitrogen fixing and

the mineralization of vegetable residual is reduced.

SOIL SOIL

SOIL

Fig. 1. Types of soil according to the pH value

Dear Customer,

Thank you for choosing a Hanna Product. Please read the instruction manual

carefully prior to use. It will provide you with necessary information for the

correct use of the kit.

Remove the test kit from the packing material and examine it carefully to make

sure that no damage has occurred during shipping. If there is any noticeable

damage, notify your Dealer or the nearest Hanna office immediately.

Each kit is supplied with:

• HI 991000 portable pH meter

• HI 1292D pH electrode

• HI 721319 soil drill

• HI 7051M soil preparation solution

• HI 70004 buffer solution pH 4.01 (1 pc.)

• HI 70007 buffer solution pH 7.01 (1 pc.)

• HI 721312 hard carrying case

• HI 740036 100 ml plastic beaker (1 pc.)

Note: Any damaged or defective item must be returned in its original packing

materials.

Note: Read the HI 991000 instruction manual to ensure correct use of the

meter.