NUTRITIOUS SUBSTRATUM FROM WASTE WATER CONTAINING MANURE
Studying the possibility of using livestock waste waters for cultivation of green fodder by hydroponics has practical value. Sewage of hydroflushing system of manure removal (manure dilution approximately by 10 times) after mechanical cleaning has the alkalescent reaction caused by availability of ammonium bicarbonate in them. рН is favorable for growth of plants and for use of ammonium nitrogen. The dry remaining balance constitutes more than 5 g/l. The harvest of green fodder in control op- tion is higher, than in experimental, and constitutes 21.29 m and 20.50 kg/m2 respectively, and content of carotene in both cases constitutes more than 60 mg/kg of a fodder. In the course of cultivation of green fodder on nutritious substratum, concentration of ammonium nitrogen in it gradually decreased, and by the end of cultivation decrease constituted 30-80%. Though in percent- age terms decrease in case of lower concentration is higher than it, than in case of high, the absolute value of consumption of nitrogen of subjects is more, than concentration is higher than it in a nutritious substratum. When given to plants of sewage with an initial ash-content of 2.5 g/l, it decreases to 1.7 g/l, i. e. by 30 %. Decrease in an ash-content from concentration of 4.5 g/l constitutes only 6 %, and in case of an initial ash-content of 6.0 g/l any noticeable change is noted, i. e. it remains practically at the same level. The technology of preparation of a nutritious substratum from the waste water containing manure is developed. The green fodder grown on a nutritious substratum is used in livestock production.