水耕培地の温度及び通気処理が作物の養分吸収, 生育, 収量に及ぼす影響

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With a view to near the condition of water culture to that of natural culture, we added two kinds of treatments to water culture. One of these was aeration to the water culture solution and another was to control temperature of water culture solution by burying pots in the soil to upper brim. 1. Aeration was carried out by following two methods. One of these was lowering the surface of water culture solution, and another was addition of dilute H_2O_2 solution to water culture solution. As to barley, both aeration methods was very effective to increase growth and yields, and absorption of nutrients was increased in the following order. P_2O_5>K_2O>CaO>NO_3-N>MgO. In the two methods of aeration, lowering surface was more simple and effective than H_2O_2 addition. The most effective and simple method for aeration was to lower surface of water culture solution by 3 to 4 cm from early March to end of culture. As to paddy rice, H_2O_2 addition was ineffective, and lowering of the surface water culture solution was rather injurious. 2. By burying pot to upper brim, apparently temperature of water culture solution approached to that of soil. (Max. temp. was lowered and min. temp. was raised.) But with regard to increase of growth and yields of the water culture plant, this treatment was ineffective. Therefore, whether this method is adopted or not should be decided according to the purpose of studies.
社団法人日本土壌肥料学会の論文
1955-09-05