陸稲の連作に関する土壌肥料的研究

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A study was preliminaly made on the successive cropping of upland rice plant on the black volcanic ash soil at Kikyogahara district, Nagano Prefecture from the view point of edaphology. The top soils and upland rice plants used were taken from the highly productive field that has been cropped successively to uplant rice plant for long years and from the neighbouring, poorly productive field that has been unable to crop it successively because of its physiological diseases etc. A remarkable difference in these fields was found that the highly productive fields have received a larger amount of stable manure than in the poorly productive fields. As expected from this fact, the determination of total soil carbon and the mineralization of soil organic nitrogen suggested that the content of soil organic matter, especially the readily decomposable organic matter is significantly higher in the highly productive fields than in the poorly productive one (Refer to Table 2 and 4). Moreover, the changes of soil redoxpotential (Eh) under waterlogged conditions, the amount of iron and manganese of soils exchanged or solved out by salt solution and dil. HCI solution and the content of iron and manganese in upland rice plant were determined. The results obtained are presented in Fig. 1,Table 5 and 6 respectively. Of the differences of productivity of upland rice plant between these fields the considerations are given as follows : The soil of the poorly productive field has a less content of readily decomposable organic matter than that of the highly productive. Subsequently, in the poorly productive field, as the readily decomposable organic matter is decomposed the soil oxygen may be consumed to a smaller extent and so the soil redoxy condition will come to be rather oxidative than in the highly productive field. Under such oxidative conditions it is apparent that soil iron and manganese are kept immobile and cannt be utilized by upland rice plant. For that reason, in the poorly productive field there probably occurs iron or manganese defficiency sympton on the rice plant. In addition, a small moisture capacity of soil as a result of low content of soil organic matter may make the upland rice plant more susceptible to drought than in the highly productive field. Thus, it should be pointed out that it is desirable for succesive cropping of upland rice plant on the upland field cultivated for many years after reclamation to supply a considerabie amount of organic matter so as to maintain a high content of the decomposable soil organic matter.
社団法人日本土壌肥料学会の論文
1954-12-15

陸稲の連作に関する土壌肥料的研究

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