Справочник Пользователя для Hanna Instruments hi 99121

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 pppppHHHHH

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.