化成肥料の肥効上の特性に就て 第二報
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概要
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We have made experiments, during the past five years, about the differences between the fertilizing value of some new compound fertilizers and the simple mixed inorganic fertilizers (consist of ammonium-sulfate, superphosphate and potassiumsulfate or potassiumchloride) with pot-, field-and laboratorical methods. As one examination, we criticized these two kinds of fertilizer by determining the quantity of nitrates which were changed from ammoniac nitrogen by the action of nitrification bacteria in soil. Some part of three essential elemmnts of these new compound fertilizers consists of chemically complicated compounds with calciumsulfate, their surfaces are covered with thin layer of citric acid soluble dicalciumphosphate or water insoluble tri-calciumphosphate. Therefore the contact surface between soil and these granular formed-fertilizers will not only be reduced but the rate of direct disolving power will be disturbed. According to these facts it may be found that the three essential elements can be stored by itself in the granular formed-fertilizer. Now on this paper we report thermostat-bath experiment. Its results are as follows. Table I. Analysed nitrogen (mg) after some definite intervals. [table] In this experiment we used little glass pots in which 300g no nutrient Arakawa Alluvian soil (Total Nitorogen 0.24%, pH 4.25) was filled, keeping 30℃, 35% moisture. We have analysed nitorogen of total soil after some definite intervals by method of A. O. A. C., Contents of each pot are 0.1g. N, P_2O_5,K_2O and 0.5g. CaCO_3 . From this table it can be ascertained that the Mikunikasei-fertilizer can delay the nitrification even at the good conditions, where simple mixed fertilizers can not.
- 社団法人日本土壌肥料学会の論文
- 1935-09-20