Roth
Well-Known Member
- Joined
- Jun 10, 2006
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For several years a "new fantastic" fertilizer, named MSU, has been promoted and sold. I have some doubts about how it has been initially discovered, or more exactly who discovered it really...
In France, we have a book, named "Cultures hydroponiques" by Coïc and LeSaint, from 1982, that give the composition of a new fertilizer for tomatoes and several crops ( they explain a couple different composition, including one for rain water, and one for tap water...)
That's the analysis of their tap water composition ( including the Calcium calculated in the solution) :
NO3 13 %
NH4 2 %
P2O5 5.5
K2O 18,5 %
CaO 13%
MgO 2.3%
Note the low NH4 content compared to NO3, the low P2O5 compared to total N, and the ration of that composition ( the others I am calculating, but there are plenty of results in google for "Coïc Lesaint")... 15:5.5:18.5 ( approx 15:5:19 then...).
Makes me think that the MSU is just a copy of that one, and in no way an "original discovery". Coic Lesaint has been promoted worldwide at that time in the horticulture industry ( including the USA) as a way to correct the hard water too. Later it has been recommended by LeSaint to alternate that formulation with a high P fertilizer and a fertilizer containing NH4...
In France, we have a book, named "Cultures hydroponiques" by Coïc and LeSaint, from 1982, that give the composition of a new fertilizer for tomatoes and several crops ( they explain a couple different composition, including one for rain water, and one for tap water...)
That's the analysis of their tap water composition ( including the Calcium calculated in the solution) :
NO3 13 %
NH4 2 %
P2O5 5.5
K2O 18,5 %
CaO 13%
MgO 2.3%
Note the low NH4 content compared to NO3, the low P2O5 compared to total N, and the ration of that composition ( the others I am calculating, but there are plenty of results in google for "Coïc Lesaint")... 15:5.5:18.5 ( approx 15:5:19 then...).
Makes me think that the MSU is just a copy of that one, and in no way an "original discovery". Coic Lesaint has been promoted worldwide at that time in the horticulture industry ( including the USA) as a way to correct the hard water too. Later it has been recommended by LeSaint to alternate that formulation with a high P fertilizer and a fertilizer containing NH4...