燐酸肥料施用法跡地水田土壌の腐植並に窒素の形態変化に関する研究(第4報)
スポンサーリンク
概要
- 論文の詳細を見る
1. The paddy soil in plot dressed repeatedly with phosphoric fertilizer shows higher content of humus than the soil undressed with phosphoric fertlizer. The results shown in table 8 show the fact that repeated dressing of phosphoric fertilizer in duces the accumulation of soil humus which is supposed to be due to the formation of humus from Lemnaceous weed and algae that tend to propagate by the dressing of phosphoric fertilizer, and also to the increase of plant debris as stubbles and roots as the plant grows vigorously by the dressing. 2. More amount of easily-decomposing humus exists in soil dressed with phosphoric fertilizer than in soil undressed. In other words, there are differences in the forms of humus or nitrogenic substance of dressed and undressed soils. As shown in table 2,some differences can be observed in carbon ratio between dressed and undressed soils which are clear from the comparison of the amount of carbon and nitrogen and also of the carbon ratio of dressed and undressed soils. In addition, it is presumpted that more amount of easily decomposing humus and available nitrogen exists in soil dressed with phosphoric fertilizer than in undressed soil as there is difference in the effect of drying and heating of dressed and undressed soils as shown in table 9. To verify this presumption, examination was carried out on the forms of nitrogen, the results of which are summarized in table 10,12,17 which shows the effect of drying and heating of soils and also in table 22. From these results the form of nitrogen differs each other in dressed and undressed soils in the following four points. (a) Amount of 2%-HCl soluble nitrogen. More amount of 2%-HCl soluble nitrogen exists decidedly in dressed than in undressed soil. (b) Amount of 2%-HCl soluble nitrogen formed by heating treatment up to 150℃. The formation of 2%-HCl soluble nitrogen by the heating treatment is decidedly bigger in dressed than in undressed soil. (c) Amount of insoluble nitrogen reduced by the heating treatment up to 150℃. The reduction of unsoluble nitrogen by the heating treatment is clearly more in dressed soil than in undressed. In other words, the dressed soil contains more amount of easily decomposing nitrogen. (d) Amount of 2%-HCl soluble nitrogen formed by the heating treatment up to 250℃. Alittle more nitrogen of this form exists in dressed soil. The above-mentioned differences are pointed out from the comparison of absolute amount of respective form, which are considered not to be erroneous as evidenced by the ratio of respective form to total nitrogen as shown in table 1,7 and in 20. 3. Therefore paddy soil reratedly dressed with phosphoric fertilizer shows higher productivity of nitrogenic orgin than undressed soil.
- 社団法人日本土壌肥料学会の論文
- 1950-12-30
著者
関連論文
- 燐酸肥料施用法試験跡地水田土壌の腐植並に窒素の形態に関する研究(第5報)
- 老朽化水田に於ける物質の溶脱に関する研究 : 第1報 窒素の溶脱に就て 第2報 鉄満俺の溶脱に就て(第21回日本農学大会土壌肥料学部会(III))
- 乾地畑作施肥法に関する研究(1) : 瀬戸内乾地畑作に於ける微量要素の行動に関する研究予報(第21回日本農学大会土壌肥料学部会(II))
- 燐酸肥料施用法跡地水田土壌の腐植並に窒素の形態変化に関する研究(第4報)
- 燐酸肥料施用法跡地水田土壌の腐植並に窒素の形態変化に関する研究(第3報)
- 燐酸肥料施用法試験跡地水田土壌の腐植並に窒素の形態に関する研究(第1〜2報)
- 老朽化水田に於ける燐酸肥料の連用が土壌に及ばす影響に関する研究
- 蕃茄弥地病に関する二三の土壌学的研究
- 沖縄土壌の全窒素並に炭素率に就て
- 土壌の反応並に其の置換性石灰含量と甘蔗の収量特に連作との関係
- 沖縄の土壌型に就て
- 沖縄県に於ける土壌型と之が甘蔗汁の成分に及ぼす影響
- 多収穫水田に就いて
- 花崗岩系秋落土壌に関する研究(第8報) : 腐植の形態に就いて(第22回日本農学大会部会講演要旨(II))
- 花崗岩系秋落土壌に関する研究(第7報) : 膠質物の二, 三の性質(第22回日本農学大会部会講演要旨(II))