化成肥料の肥効上の特性に就て(第三報)

概要

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In the previous report relating to the fertilizing value of the new compound fertilizers, Mizuhokasei and Mikunikasei, and the effects of nitrification bacteria in soil upon them, we established that the fertilizing value or activity of these new compound fertilizers in soil can be preserved longer than simple mixed fertilizers. It is expected generally that these fertilizers would show their peculiarity in some other experiments, for instance, in the experiment by the method of common pot culture, but their peculiar properties would be observed as magnified in next mentioned conditions. From this point of view, we deviced to wedge a glass stopper cock at the bottom of the WAGNER pot, and the nutrient, changed into soluble movable state, was allowed to flow out by opening this cock. We investigated through analysis the amounts of nitrogen which were leaked out, and discussed the results concerned to the growth of crops. The results are given in the following table. Five stumps of barley were taken in each pot and the added quantities of N, P_2O_5 , K_2O were respectively 0.5g, 1g, 1g. [table] Considering the relation of the leaking period to the yields, shown in the above table, we ascertain that the new compound fertilizers are somewhat superior to the simple mixed fertilizers in the power of preserving their fertilizing value and increasing the yield of the crops.
社団法人日本土壌肥料学会の論文
1935-12-10