七島藺に対する硫酸礬土の影響に就て

概要

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A study was made of the influence of aluminiumsulphate on the growth and quality of the sititoi (stuff of Japanese mat). The results were obtained as follows : On the cultivation of the sititoi the application of aluminiumsulphate have much favarable effect upon its growth, yield and quality. This results are probably due to the increase of the soil acidity because the similar results are obtained by applying sulphuric acid. On the water culture, however, the best growth is observed at pH 6 and yields decrease gradually with the increase of acidity, though the rather normal growth is obtained at pH 4. For this reason, it should be considered that the effect of acidity is not direct but indirect. According to the experiment, in the presence of acidic substances mentioned abobe, the content of ammonium in the soil is higher than in the untreated soil in paddy field. But the percentage, not the total amount, of the nitrogen of the crops under these conditions is not always higher in spite of its deep green colour. This colour change should be responsible for the absorption of iron.
社団法人日本土壌肥料学会の論文
1935-12-10