Hanna Instruments HI 993310 Instruction Manual Download Page 5

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If slow releasing fertilizers are employed, one can regularly control
their effectiveness by testing the soil salinity.

HIGH SALINITY

Soluble salts are indispensable for plant nutrition. However, when

dosed in excess, they can cause various anomalies: toxicity, alteration

of the equilibrium in nutrient absorption, difficulty in absorbing
water, changing of the pH value and damaging the soil structure.
Some types of soils are naturally rich in salts. Apart from these, an

excessive use of fertilizers must be avoided and particular attention

must be paid to use of water with high salt concentration.
If high values are detected, use the appropriate techniques to reduce
the presence of salts (washing away irrigation, reduction of fertilizer

dosages, addition of gypsum if salinity is caused by sodium, etc.).

IRRIGATION

If the measured values are low it can be due to the fact that the soil

is dry. In this case, repeat the tests after adding demineralized water

to the soil. Even soils rich in nutrients can give low values if they are

not wet enough. Irrigation schedules can then be made based on the
measured value.
In case of waterlogged soil, the values can be very high indicating

stressed plants.

How to use the soil probe

How to use the soil probe
- The probe should be inserted in the soil where the roots are more
dense or numerous.
-The recommended depth is 10-15 cm (4-6") for lawn and young

plants;
-20-30 cm (8-12") for vegetables and small plant;
-For plants with deep roots (e.g. trees, maize, sunflower etc.), it is
advised to measure at different depths (e.g., 30, 50 and 80 cm,

that is 12, 20 and 32").
- Take the measure in more spots to have a representative average.
- The soil has to be wet. If the soil is dry, add demineralized water.
- The tip of the probe must be in complete contact with the soil. If the

substrate is too soft, press it with your fingers to achieve a proper
contact.
- Wait until the value on the display is stabilized.

All Hanna Instruments meters are warranted for two years against
defects in workmanship and materials when used for their intended

purpose and maintained according to instructions. The electrodes and

the probes are warranted for a period of six months. This warranty is
limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed

maintenance are not covered.
If service is required, contact the dealer from whom you purchased the

instrument. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. If the repair

is not covered by the warranty, you will be notified of the charges

incurred. If the instrument is to be returned to Hanna Instruments,
first obtain a Returned Goods Authorization number from the Cus-

tomer Service department and then send it with shipping costs

prepaid. When shipping any instrument, make sure it is properly

packaged for complete protection.
To validate your warranty, fill out and return the enclosed warranty
card within 14 days from the date of purchase.

All rights are reserved. Reproduction in whole or in part is
prohibited without the written consent of the copyright owner,
Hanna Instruments Inc.

WARRANTY