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23

Appendix 4

Classification of

Greenhouse Media

Soluble salt guidelines for greenhouse media using
various media to water ratios (Testing and Nutrition
Guideline, MSU Ag Facts Extension Bulletin E-1736,
September, 1983).

a

saturated media extract

b

1 part soil to 2 parts water

c

1 part soil to 5 parts water

Comments

SME

a

1 to 2

b

1 to 5

c

Very low levels. Indicates
very low nutrient status.

0 - .74

0 - .25

0 - .12

Suitable range for seedlings
and salt sensitive plants.

.75 - 1.99

.25 - .75

.12 - .35

Desirable range for most
established plants. Upper
range may reduce growth
of some sensitive plants.

2.00 - 3.49

.75 - 1.25

.35 - .65

Slightly higher than desir-
able. Loss of vigor in upper
range. OK for high nutrient
requiring plants.

3.50 - 5.00 1.25 - 1.75 .65 - .90

Reduced growth and vigor.
Wilting and marginal leaf
burn.

5.00 - 6.00 1.75 - 2.25 .90 - 1.10

Severe salt injury symp-
toms with crop.

6.00+

2.25+

1.10+

Electrical Conductivity (mS/cm)

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Содержание Field Scout 2265FS

Страница 1: ...Catalog s 2265FS 2265FSTP Field Scout Soil Water EC Meter Technologies Inc Spectrum ...

Страница 2: ...lassification of Irrigation Water 22 4 Classification of Greenhouse Media 23 5 Diagnostic Messages 24 6 Celsius to Fahrenheit Conversion Chart 25 Warranty 26 This manual will familiarize you with the features and operation of your Field Scout Soil Water EC Meter Please read this manual thoroughly before using your meter For customer support or to place an order call Spectrum Technologies Inc 800 2...

Страница 3: ...to the salinity of the soil solution EC measurement is also affected by temperature and to a lesser degree by soil moisture content Use this portable EC meter and probe to measure sa linity in greenhouse soil media right on the spot with out tedious soil sampling and preparation Green house production managers can compare readings from plant to plant and fine tune their fertility program because m...

Страница 4: ...tions requiring frequent fer tilization EC should be checked regularly to ensure the plants are getting sufficient nutrients while avoid ing the effects of salt toxicity See Appendix 1 p 18 for a list of preferred EC values for some com mon plants Typically younger plants will require lower EC than mature plants The stainless steel soil EC probe is de signed to be in serted directly into soil The ...

Страница 5: ...vel has approximately reached field capacity The probe should be inserted in the root zone The measurement region is at the tip of the probe For turf the root zone is approximately 2 4 For vege tables and small plants this is about 8 12 Wait until the meter reading stabilizes before withdrawing the probe Taking several measurements will allow a representative average to be computed Important Do no...

Страница 6: ...ration of the meter can be checked by immersing the sensor in this solution This solution should not be re used at a later date Calibration Procedure 1 Open battery compartment lid on the top of the meter to access the small white Increment INC and Decrement DEC calibration keys When looking at the battery compartment with the calibration keys above the batteries the DEC key will be to the left Pr...

Страница 7: ... buffer solution Wait for display to stabilize display value is unchanged and stable for 3 seconds 4 Pressing either calibration key will put the meter into CALIBRATION mode Press the INC or DEC key to adjust the reading If a key is held down the adjustment will happen more rapidly 5 When the EC of the calibration standard is reached release the keys for 3 seconds The tem perature reading will bri...

Страница 8: ...go into calibration selection mode 3 The lower display shows A CAL and the upper display blinks the current choice YES or NO Press either the INC or DEC key to select the NO option This disables the Automatic calibration mode and configures the display for Manual calibration 4 Press the HOLD ENTER button to confirm the se lection The display shows CO 5 After 1 second the lower display will show 1 ...

Страница 9: ...I See table 1 for a description of each range 3 Press the HOLD ENTER button to select the HI option In this mode the units for EC will always be in mS cm Some users prefer to set the meter on AUTO range This gives greater resolution at low EC s Abbreviation EC Range PU 0 to 200 0 µS cm LO 0 to 2000 µS cm HI 0 to 20 00 mS cm AUTO Automatic Table 1 Definition of the 4 EC range modes that can be set ...

Страница 10: ... saturation will have readings 10 15 more than SME measurements due to a lesser amount of water in the soil Soil EC measurements should be made 30 60 minutes after irrigation Procedure Press On Off button to power up the meter Insert the probe tip 1 inch below soil surface Wait for reading to stabilize stable for 3 seconds Automatic Temperature Compensation ATC will correct for temperature changes...

Страница 11: ...rized as this will affect the growth medium properties and alter the results Tra ditionally the soil solution from the saturated me dium is extracted by a vacuum pump However the Field Scout Soil Water EC Meter allows the satu rated sample to be tested directly Procedure Moisten the media sample with distilled water to reach a consistent saturated moisture level When saturated the media should gli...

Страница 12: ...r 3 seconds Other Features Hold Pressing the HOLD key will freeze the display Press HOLD again to release Temperature Units Press the C F key to toggle between displaying tem perature in Fahrenheit and Celsius Auto Ranging If the meter s range mode is set to AUTO see Meter Configuration p 8 the LCD will automatically tran sition from mS cm to µS cm as the unit of measure when the EC value gets sma...

Страница 13: ...ake fu ture battery removal much easier 3 Recalibrate meter after every battery change Maintenance To improve performance and avoid transferring soil borne diseases clean the sensor tip by rinsing in al cohol for 5 10 minutes Replace all batteries if low battery indicator appears or if readings are faint or unstable Store the probe sensor dry Important Do not touch the sensor tip with your fingers...

Страница 14: ...or tip Replacing a tip 24 probes only The replaceable tip left is designed to thread in and out of the end of the probe A new tip has two flat faces on opposite sides This al lows the tip to be tightened onto the probe with a pliers or 5 16 wrench I Removing a direct insert probe The 8 probe and older 24 probes do not have a re placeable tip The replacement procedure is outlined below 1 Remove the...

Страница 15: ...d the assembly 4 Attach the probe plug to the socket in the meter housing 5 Push the assembly onto the meter housing so the metal pegs on the assembly line up with the notches on the inner diameter of the meter open ing Be sure that the small o ring sits at the base of the large plastic assembly 6 While holding the assembly in place hand tighten the nut to the strain relief 7 Connect and tighten t...

Страница 16: ... probe cable plug is firmly con nected to the socket in the meter 4 Push the assembly onto the meter housing so the metal pegs on the assembly line up with the notches on the inner diameter of the meter open ing Be sure that the small o ring sits at the base of the large plastic assembly 5 While holding the assembly in place hand tighten the nut to the strain relief 6 Connect and tighten the tan n...

Страница 17: ... o F Range Accuracy EC 1 Full Scale Temperature 0 5 o C EC Resolution 0 01 mS cm Calibration 1 point with 2 76 mS cm standard Temperature Automatic from 0 to 50o C Compensation Power Four LR44 1 5V alkaline batteries Battery Life 150 hours Auto Shutoff After 8 5 minutes Specifications ...

Страница 18: ... 5 Eggplant 2 5 3 0 Melon 1 5 2 5 Potato 2 0 3 0 Pepper 2 0 3 0 Pea 1 0 1 5 Tomato 2 5 5 0 Celery 2 0 2 5 Marrow 2 0 2 5 Recommended soil EC for selected vegetable crops Note The values on this table refer to measurement of a saturated media extract SME See Appendix 3 for information on converting from direct insert readings to SME Appendix 1 Preferred EC Values for Selected Plants ...

Страница 19: ...5 2 8 4 1 Pansies during active growth 0 25 1 5 0 1 0 6 0 35 2 1 Geraniumus during active growth 1 6 2 4 0 65 1 0 2 2 3 3 Comparison of substrate tests for various EC sam pling methods Calvins Whipker and Fonteno North Carolina State University a saturated media extract b 1 part soil to 2 parts water ...

Страница 20: ... the Field Scout meter This equa tion is the basis for table 1 Table 2 lists a variety of grass species and the range of EC values converted to SME they can tolerate FS SME FS SME FS SME 0 1 1 1 1 1 3 8 2 1 6 5 0 2 1 3 1 2 4 0 2 2 6 7 0 3 1 6 1 3 4 3 2 3 7 0 0 4 1 9 1 4 4 6 2 4 7 3 0 5 2 2 1 5 4 9 2 5 7 6 0 6 2 4 1 6 5 1 2 6 7 8 0 7 2 7 1 7 5 4 2 7 8 1 0 8 3 0 1 8 5 7 2 8 8 4 0 9 3 2 1 9 5 9 2 9 8...

Страница 21: ...uegrass Creeping Bentgrass Tall Fescue Seashore Paspalum Rough Bluegrass Hard Fescue Buffalograss St Augustine grass Centipedegrass Bahiagrass Zoysiagrass Table 2 Relative tolerance of turfgrasses to soil sa linity measured by the SME Method Salinity in Turfgrass Harivandi M A Butler J D Lin W 1992 Note The values on this table refer to measurement of a saturated media extract SME Use table 1 to c...

Страница 22: ...od 0 25 mS cm EC 0 75 mS cm Permissible 0 75 mS cm EC 2 0 mS cm Doubtful 2 0 mS cm EC 3 0 mS cm Unsuitable EC 3 0 mS cm Categories of irrigation water quality based on electrical conductivity Wilcox L V 1948 The Quality of Water for Irrigation Use USDA Techni cal Bulletin 962 ...

Страница 23: ...levels Indicates very low nutrient status 0 74 0 25 0 12 Suitable range for seedlings and salt sensitive plants 75 1 99 25 75 12 35 Desirable range for most established plants Upper range may reduce growth of some sensitive plants 2 00 3 49 75 1 25 35 65 Slightly higher than desir able Loss of vigor in upper range OK for high nutrient requiring plants 3 50 5 00 1 25 1 75 65 90 Reduced growth and v...

Страница 24: ... Measured EC or temperature value exceeds speci fied maximum or minimum value Sensor electrodes have short circuited Sensor is not connected properly see Checking Probe Connection p 16 OR UR ATC blinking Short or open circuit at the built in temperature sensor Er 0 Temperature not within specified range Er 1 EC not within specified range ...

Страница 25: ... 48 2 24 75 2 39 102 2 10 50 0 25 77 0 40 104 0 11 51 8 26 78 8 41 105 8 12 53 6 27 80 6 42 107 6 13 55 4 28 82 4 43 109 4 14 57 2 29 84 2 44 111 2 Appendix 6 Celsius to Fahrenheit Conversion Chart The Field Scout Soil Water EC Meter gives tem perature readings in Celsius The conversion from Celsius to Fahrenheit is calculated with the following equation F 9 5 C 32 This information is also contain...

Страница 26: ...s postage shall be born by the customer a When the date of purchase and store name is not written on the warranty b When trouble or damage has been incurred due to misuse abuse and or improper handling c When the meter has been repaired modified and dismantled by persons other than the designated agent or service shop d In the event of changes in external appearance such as scratches or dirt cause...

Страница 27: ...27 ...

Страница 28: ...r a technical support person will be able to assist you If for any reason you are not satisfied or the meter has failed and you need to return the product for service you will need to contact Spectrum Technologies Inc Before returning a failed unit you must obtain a Returned Goods Authorization RGA number from Spectrum You must ship the product s properly packaged against further damage back to Sp...

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