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**To**:**aquatic-plants at actwin_com****Subject**:**Is my calculations OK?****From**:**Daud Datu <daud6198 at yahoo_com>**- Date: Mon, 15 Mar 1999 07:48:57 -0800 (PST)

I managed to get hold of a UK based product by the name of LIBREL. It is a chelated trace element mix consisting of 1.7% Cu 3.35% Fe 1.70% Mn 0.60% Zn 0.875% B 0.023% Mo The stuff is nicely package in a 1 kg pack (smallest). However, since the nutrients ratio are non-identical to that of PMDD's recipe, I need some helping hand to confirm whether my calculations are correct. 1) Dissolving 1 gram of LIBREL in 1000 litre of water will give a concentration of Fe = 0.035 ppm 2) In the Sears-Conlin paper at http://www.thekrib.com/Plants/Fertilizer/sears-conlin.html under RECOMMENDATIONS paragraph four item 2: the ratio of Mg to Fe was recommended at 1.5-5.0ppm Mg to 1ppm Fe. Under APPENDIX A - FERTILIZER RECIPE (Poor Man's Dupla Drops) of 9 grams of trace mix (7% Fe...) is supposed to be mixed with 14 grams K2S04 6g grams KNO3 33 grams MgSO4.7H2O a) If the above stuff are mixed into 1000 litre of water, we will get a concentration of Fe = 0.07 x 9 = 0.63 ppm b) Dissolving 1 gm of MgSO4.7H2O into 1000 litre of water will produce a concentration of Mg = 0.0987 ppm. 33 grams will produce 33 x 0.0987 = 3.2571ppm Ratio of Mg to Fe = 3.2571 / 0.63 = 5.17 Therefore, 2) above is correct, IF and ONLY IF my calculations are OK :( 3) a)1 gram of LIBREL will produce a concentration of Fe = 0.035 ppm to get 0.63ppm Fe, I need 0.63 / 0.035 = 18 grams of LIBREL b) I think the volume of MgSO4, KNO3 and K2SO4 still remains. THEREFOR I need: 18 grams of LIBREL chelated trace element mix 14 grams K2SO4 6 grams KNO3 33 grams MgSO4.7H2O 300ml distilled water Appreciate if somebody can endorse my calculations. Thank you. Daud Datu Brunei _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com

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