User manual HANNA INSTRUMENTS HI 993310

[. . . ] Instruction Manual HI 993310 Portable Water Conductivity & Soil Activity Meter www. hannainst. com 1 Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the meter. This manual will provide you with the necessary information for correct use of the instrument, as well as a more precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] 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, very high values indicate stressed plants. Find in the following pages a table with some indicative values for soil activity required by some common plants. 5 ORNAMENTAL PLANTS & FLOWERS Amaranthus Anthurium Azalea Begonia Chrysanthemum Croton Cyclamen Dahlia Dieffenbachia Dracaena Euphorbia Ficus Gerbera Kalanchoe Lilium Orchid Pelargonium Peperomia Philodendron Rose Saintpaulia Violet LAWN Lawn ORCHARD Apricot Orange Cherry Lemon Apple Walnut Pear Peach Plum Grapevine IDEAL VALUES 0. 4-0. 6 0. 2-0. 4 0. 3-0. 5 0. 3-0. 6 0. 4-0. 7 0. 2-0. 4 0. 4-0. 6 0. 4-0. 5 0. 4-0. 6 0. 2-0. 4 0. 4-0. 6 0. 4-0. 7 0. 4-0. 6 0. 2-0. 5 0. 3-0. 6 0. 2-0. 4 0. 2-0. 4 0. 3-0. 5 0. 4-0. 6 0. 2-0. 5 0. 3-0. 5 0. 2-0. 4 IDEAL VALUES 0. 1-0. 4 IDEAL VALUES 0. 2-0. 4 0. 1-0. 3 0. 2-0. 4 0. 1-0. 3 0. 2-0. 3 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 6 VEGETABLES & HERBACEOUS CULTIVATIONS Asparagus Sugar beet Carrot Cauliflower Cucumber Onion Watermelon Cotton Lettuce Maize Egg plant Melon Bean Strawberry Wheat Oat Potato Pepper Pea Tomato Soybean Spinach Tobacco IDEAL VALUES 0. 2-0. 4 0. 3-0. 5 0. 2-0. 4 0. 3-0. 5 0. 3-0. 5 0. 2-0. 5 0. 2-0. 4 0. 2-0. 4 0. 3-0. 5 0. 3-0. 5 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 4 0. 2-0. 5 0. 2-0. 4 0. 2-0. 3 0. 2-0. 6 0. 2-0. 3 0. 2-0. 4 0. 2-0. 4 7 WATER CONDUCTIVITY NUTRITIVE SOLUTIONS The nutritive solutions constitute one of the most important factors in determining the plant's growth and yield. Hence, putting the right solution at the plant's disposal is indispensable to get the best result. Conductivity (EC) of nutritive solutions must be checked regularly to ensure that it agrees with plant's requirements. The plants also have seasonal preferences, typically requiring lower concentrations in the summer. PLANT Asparagus Watermelon Carrot Cabbage Cucumber Chrysanthemum Onion Bean Strawberry Lettuce Egg plant Melon Potato Pepper Pea Tomato Celery Marrow PREFERRED EC VALUES 1. 50-2. 00 mS/cm 1. 50-2. 50 mS/cm 1. 50-2. 00 mS/cm 2. 00-3. 00 mS/cm 2. 00-3. 00 mS/cm 1. 50-2. 50 mS/cm 1. 50-2. 00 mS/cm 2. 00-2. 50 mS/cm 2. 00-2. 50 mS/cm 1. 00-1. 50 mS/cm 2. 50-3. 00 mS/cm 1. 50-2. 50 mS/cm 2. 00-3. 00 mS/cm 2. 00-3. 00 mS/cm 1. 00-1. 50 mS/cm 2. 50-5. 00 mS/cm 2. 00-2. 50 mS/cm 2. 00-2. 50 mS/cm 8 IRRIGATION WATER The irrigation water must be checked regularly, especially in the hydroponics industry. Conductivity is the most important parameter to check since plants can be seriously damaged by too high EC value. Water used for irrigation has been classified in four classes, depending on its conductivity: Class Class Class Class I II III IV EC < 0. 75 mS/cm EC = 0. 75 to 2. 50 mS/cm EC = 2. 50 to 4. 00 mS/cm EC > 4. 00 mS/cm Class I: This type of water can be used without any quantity limitation. Class II: Only a limited quantity should be used depending on the irrigation techniques and the crop. Class III: May be used occasionally, but only for tolerant plants and/or well-drained soils. Class IV: To be used only if there is no other alternative and as little as possible. SATURATED SOIL-PASTE CONDUCTIVITY The conductivity value of the saturated soil-paste can be used for classifying the salinity level of the soil and also provides indications about the soil productivity, depending on plants (see also the table on next page for reference). Response of cultivations depends also from different saturated soilpaste conductivity values. Find below a schematic classification made by the U. S. · EC = 0 mS/cm : the salinity effect is negligible. · EC = 2 mS/cm : the crop of the more sensible cultivations can be reduced. · EC = 4 mS/cm : the crop of many cultivations is reduced. · EC = 8 mS/cm : only tolerant plants produce a satisfactory crop. · EC = 16 mS/cm : only a few very tolerant plants produce a satisfactory crop. 9 Tolerance of some common plants to the soil conductivity (Ayers & Westcot, 1976). · EC0 = maximum of tolerated soil conductivity (salinity). · EC75 = with this soil conductivity value the 75% of the maximum yield is produced. [. . . ] Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC performance. To avoid electrical shock, do not use these instruments when voltages at the measurement surface exceed 24VAC or 60VDC. Use plastic beakers to minimize any EMC interferences. To avoid damage or burns, do not perform any measurement in microwave ovens. 16 BATTERY REPLACEMENT The instrument is powered by a 9 V battery and is provided with the Battery Error Prevention System (BEPS), which turns the unit off when a low battery signal is detected. [. . . ]