活性汚泥の窒素の肥効に就て

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In this paper the authors investigated the manurial value of activated sludge as nitrogenous fertilizer, which was produced by the sewage purification plant at Atsuta, Nagoya City, by pot culture experiments and laboratory nitrification and ammonification tests in soils under dry farm and water-logged conditions. The results may be summarized as follows : 1. The results of the nitrification and ammonification tests showed that, a portion of nitrogen in activated sludge converted rapidly into nitrate and ammonia in the early stage of incubation, but the rest of it showed a slow production of nitrate and ammonia ; the rate of nitrification and ammonification of activated sludge was inferior to that of fish guano and soybean cake at any stage of the experiment lasted 100 days. 2. The pot experiments were carried out in two cases (a) with paddy rice and barley of long period of growth (4 or 6 months)and (b) with komatsuna (Brassica chinencea, L.) of rather short period of growth (about 52 days). In the case of (a) the activated sludge as a source of nitrogen was observed to be less effective than sulfate of ammonia, fish guano and soybean cake, while in the case of (b) it was slightly inferior to sulfate of ammonia, and approximately equal to fish guano and soybean cake. These results of the pot experiments showed a fairly close agreement with that of aforementioned laboratory measurements on nitrate and ammonia accumulation.
社団法人日本土壌肥料学会の論文
1935-06-20

活性汚泥の窒素の肥効に就て

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