Mother's Mini-Manual HYDROPONICS
(Page 5 of 7)
To mix less than 100 gallons of solution, merely mix and store the larger quantity of powders, then use at the rate of 4 tsp. per gallon, or 1/2 lb. to 25 gallons. For larger quantities, simply multiply the formula.
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TRACE ELEMENTS are mixed separately, but must be included in each batch of nutrient solution. The various powders must be ground very fine with a mortar and pestle and mixed very thoroughly. When adding dry trace mix to a batch of dry powders which are to be used a bit at a time, the trace elements must be mixed in very thoroughly to get even distribution.
Mix well and store dry. Use 1 gram (about 1/2 tsp.) per 100 gallons of nutrient solution. For smaller batches, dissolve 112 tsp. of the trace mix into one quart of water, use 1 liquid oz. per 3 gallons of nutrient solution. Do not try to save any unused trace mix solution. (Note:Many hydroponics books suggest that the do-it-yourselfer forget the trace mix and simply add a pinch of iron sulphate?enough to cover the head of a match?to the original mixture. Quite often the other micro?nutrients will be present as impurities in the water and fertilizers.?MOTHER.)
ORGANIC FORMULAS. Another fascinating aspect of hydroponic food making is the manufacture of nutrient solutions from 100% natural/organic substances. That's right . . . organic hydroponics!
The Sharder process (a hydroponics method developed in the poor regions of India where chemical fertilizers are largely unavailable) uses a growing medium consisting of five parts small gravel and one part fine sand. Set into the beds at 2- to 3- foot intervals are sludge pots, which are any kind of covered vessel which will hold about two pounds of sludge, lined with a screen and pierced with numerous little holes in the bottom. Here is one recipe for nutrient sludge:
Mix well and dilute with water into a thick sludge, then place in the sludge pots. Use plain water in the same manner as normal hydroponic operation and the pots will slowly release their nutrients. Watch the pots carefully to keep them from running out, and also to keep them from drying out. The sludge has to be kept moist enough to release slowly through the screen-lining of the pot.
Here's another recipe which uses manure and oilcake. Oilcake is the leftovers after pressing seeds of cotton, hemp, flax, soybean, etc., for oil. It is normally used as feed, and may be obtained in feed stores.
The oilcake is matured by mixing in a little water, some ground bones, and some potash . . . then storing everything in a closed container for a couple of months (which disposes of smells). To about one pound of dried dung, add about 114 oz. of matured oilcake, then mix with enough water to form a sludge. Use as described in the previous recipe.
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