Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Akerne's RAIN MIX
Hello all,
A lot of discussion has been going on on rec.gardens.orchids lately concerning our “RAIN MIX” and the amount to use per litre. I thought the group here would benefit as well from our answer we typed as a response to some questions received directly. The recommended dosage for RAIN MIX is as follows: 0,5 g/l = ~ 520 µS/cm = ~ pH 6,1 A little note concerning TDS measurements: A TDS meter measures the conductivity of a saltsolution and gives, through a conversionfactor, a reading of the amount of disolved salts expressed in ppm. Most TDS meters have a conversionfactor of 0,50 and are therefore correct for measuring NaCl-saltsolution. 0,01 mole/l solution of NaCl contains 585 mg NaCl/l and gives an EC value of 1155 µS/cm. 585 mg NaCl/l = 585 ppm TDS 585 / 1155 = 0,506 Unfortunately we are not measuring a saltsolution of NaCl, but a NPK fertilizer saltsolution. Every salt in that mixture has a different conductivity. In a mix of salts one must take into account the contribution of conductivity of each individual ion and also the interactions between these ions. Therefore one must use a different conversionfactor for each different combination. On regular TDS meters the conversionfactor cannot be adjusted/changed, on more expensive, professional meters this can however be done. Test: Put 1000 mg of RAIN MIX in beaker of 1000 ml. Add demineralised water and shake until all salts are disolved. Measure the amount of salt with your TDS meter. You would expect to obtain 1000 ppm TDS, however this is not the case! For this reason in professional horticulture µS of mS is used and not TDS. Likewise the amount of N is expressed in mmole/l and not ppm. How much ppm N does a solution contain with 0,5 gr RAIN MIX / liter? - NPK RAIN MIX = 13-3-15 - amount of N = 13% - 130 g N per kilo RAIN MIX - per 0,5 g RAIN MIX you have 130 g / 1000 g * 0,5 g = 0,065 g or 65 mg N present - this 65 mg N is in 1 l of water = 1000 ml = 1000 gr or 1000000 mg water - 65 mg/ 1000000 mg = 65 ppm N In order to give you extra information have a look at the following (source: http://los.lon.imag.net/MiscFiles/fert1.htm ) With our recommended dosage (0,5 g/l to obtain a conductivity of 520 µS/cm) we are closer to the 50 ppm N in the below charts to make it easier for you all. Our recommended dosage caters for all orchids be they salt sensitive plants like Disa, Pleurothallids in general over to Paphiopedilums to the really big eaters like Cattleya and Cymbidium and requires NO flushing with pure water. Hence our dosage is a good value for all type of orchids and has been tested for over 2 years on our orchids (no exclusion) and the mixed orchid collections of a few selected orchid amateurs! If you look at the 125 ppm N column than you will see that the conductivity is 1000 µS/cm… this means you will run into problems with salt sensitive orchids and you MAY need to flush with pure water every x time! A complete waste of fertilizer… and money ;-) If you cannot see the below charts properly then please visit the page mentioned above and go the section on the 13-3-15 fertilizer! EC chart ppm N 50 100 125 150 200 EC 0.4 0.8 1.0 1.2 1.6 Mixing Instructions 50 ppm N 100 ppm N 125 ppm N 150 ppm N 200 ppm N Per U.S. gallon of fertilizer 0.05 oz. (1.4 grams) 0.10 oz. (2.8 grams) 0.12 oz. (3.6 grams) 0.15 oz. (4.3 grams) 0.20 oz. (5.7 grams) Mixing Instructions -Imperial Gallon 50 ppm N 100 ppm N 125 ppm N 150 ppm N 200 ppm N Per Imp. gallon of fertilizer 0.06 oz. (1.68 grams) 0.12 oz. (3.36 grams) 0.14 oz. (4.32 grams) 0.18 oz. (5.16 grams) 0.24 oz. (6.9 grams) kind regards, Kenneth. Akerne Orchids Laarsebeekdreef 4, B-2900 Schoten, Belgium tel. +32 (0)3 651 40 36 fax +32 (0)3 653 06 76 www.akerne-orchids.com See us at the following shows and events in 2009: • Gentse Orchideeëndagen, Ghent, Belgium (October 9-11) Looking for orchid books and magazines? Visit www.orchidbooks.eu |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
RAIN SOUND RAINING RAIN RAINY RAINING SOUND RAIN RAINY | Gardening | |||
Rain, Rain, Rain | United Kingdom | |||
Rain, Rain, Rain | United Kingdom | |||
Rain, Rain, Rain | United Kingdom | |||
Rain...Rain....Rain | United Kingdom |